JP2009207488A - Method for preparing nutrient enriched rice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing nutrient enriched rice abundantly containing nutrients such as γ-aminobutyric acid, even through removing bran layers and embryo buds by rice polishing. <P>SOLUTION: The method for preparing nutrient enriched rice includes: harvesting S1 for obtaining unhusked rice grains 2, a raw material, from rice plants in a field; a nutrient enriching process S8 of changing unhusked rice grain 2 to nutrient enriched unhusked rice grains 3, including soaking the undried and the unhusked rice grains 2 in a soaking bath at a predetermined temperature of 56°C or higher for a predetermined time to enrich nutrients of γ-aminobutyric acid, etc., in a part including endosperm part of the unhusked rice grain 2; a process S9 of drying the nutrient enriched unhusked rice grain 3; and a process S10 of obtaining nutrient enriched polished rice 5 which abundantly contains nutrients such as the γ-aminobutyric acid by polishing nutrient enriched brown rice 4a which is obtained by removing chaff from the dried nutrient enriched unhusked rice grain 4, and removing the bran layer and embryo bud. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing rice containing abundant γ-aminobutyric acid in the endosperm portion.

  Conventionally, intake of γ-aminobutyric acid is said to have effects of preventing hypertension and improving blood flow, and foods containing a large amount of γ-aminobutyric acid have been produced. In addition, it is generally known that when brown rice having germ is germinated to be germinated brown rice, nutrients such as γ-aminobutyric acid and vitamin B group can be enriched as compared with normal brown rice.

  Conventional germinated brown rice has been produced by immersing and germinating brown rice in water at a temperature suitable for germination. Conventional germinated brown rice has a so-called “pigeon chest state” in which the germ grows to a size of about 0.5 mm to 2.0 mm, and germination can be confirmed apparently. In addition, nutrients such as γ-aminobutyric acid were enriched in the germ and cocoon layer. Moreover, the technique of manufacturing the germinated germ rice which applied the technique of germinating brown rice and left the germ and removed the cocoon layer is also generally known (for example, refer patent document 1). Normal brown rice contains about 2 mg / 100 g to 3 mg / 100 g of γ-aminobutyric acid, and white rice contains only about 1 mg / 100 g, whereas in germinated brown rice and germinated germinated rice, γ-aminobutyric acid is 5 mg / 100 g. It is enriched to about 100 to 20 mg / 100 g, reaching 5 to 20 times the equivalent of white rice.

  However, germinated brown rice and germinated germ rice have a problem that they have poorer taste than white rice due to the remaining germ and cocoon layers, and have not been widely consumed. In addition, germinated brown rice and germinated germinated rice are enriched with nutrients such as γ-aminobutyric acid concentrated in the germ and the cocoon layer. There existed a problem that nutrients, such as enriched (gamma) -aminobutyric acid, would fall until it became equivalent to normal white rice.

  Therefore, in view of the above situation, the present invention is a method for producing a nutrient-enriched rice that produces nutrient-enriched rice that is rich in nutrients such as γ-aminobutyric acid even if the cocoon layer and germ are removed by scouring. Providing is an issue.

The method for producing nutrient-enriched rice according to the present invention is as follows: “An ungerminated rice bran that has an average moisture content of 23% or more and has not germinated.
Having a nutrient enrichment step of enriching the nutrients containing γ-aminobutyric acid in the endosperm portion of the ungerminated cocoon by heating at a predetermined temperature between 56 ° C. and 68 ° C. for a predetermined time by a heating means ” It is a feature.

  Here, “ungerminated cocoon” means a cocoon in which it is difficult to visually confirm the elongation of the germ. As previously mentioned, germinated brown rice can be visually confirmed that the germ swelled and has become a pigeon breast state, whereas ungerminated buds are those in which germ growth has not progressed until the pigeon breast state is reached Indicates.

  Further, “nutrients containing γ-aminobutyric acid” are various nutrients contained in rice in addition to starch, and besides γ-aminobutyric acid, for example, vitamin B1, vitamin B2, vitamin B6, vitamin E Folic acid, pantothenic acid and the like. Hereinafter, when “nutrients such as γ-aminobutyric acid” are described, “nutrients containing γ-aminobutyric acid” are indicated.

  In the present invention, the “endosperm portion” is not strictly limited to only endosperm, but indicates the entire portion of rice contained in white rice refined by a general method. That is, when white rice is obtained by milling, it is generally so-called “sufficiently milled” to yield 90% yield to obtain white rice. Also in the present invention, the “endosperm part” includes a minute amount of germs and an attached portion of the cocoon layer that adhere to general white rice.

  “Nutrient-enriched rice” refers to rice in which nutrient enrichment has occurred in the endosperm due to biological activities in the germination process, particularly biological activities prior to germ elongation, for nutrients such as γ-aminobutyric acid. Conventional germinated brown rice was rice that was concentrated in the germ and cocoon layers during the biological activities associated with the elongation of the germ, but caused nutrient enrichment. However, the germ remained ungrown, such as γ-aminobutyric acid. It is more desirable that the elongation of the germ is not progressed, because the enrichment of the nutrients can prevent consumption of the nutrient due to the elongation of the germ. Moreover, since “nutrient-enriched rice” is enriched with nutrients such as γ-aminobutyric acid in the endosperm portion, it can suppress loss of nutrients such as γ-aminobutyric acid even if the germ and cocoon layer are removed. it can. Therefore, “nutrition-enriched rice” also includes white rice, embryonated rice, and split rice from which the germ and the cocoon layer have been removed by sperm and the like after the above-described nutrient enrichment.

  In addition, when mentioning the moisture content of rice bran below, the moisture content of brown rice in the state where rice hulls are removed from the rice cake is shown.

  According to the present invention, a cocoon having a rice husk, an embryo and a cocoon layer, and having an average water content of 23% or more is subjected to a predetermined time at a predetermined temperature of 56 ° C. or higher and 68 ° C. or lower in a nutrient enrichment process. It is possible to produce a nutrient-enriched rice in which nutrients such as γ-aminobutyric acid are enriched not only in the germ or cocoon layer but also in the endosperm.

  In conventional germinated brown rice, nutrients such as γ-aminobutyric acid that are enriched in the germination process are mainly concentrated in the germ, and if the germ and cocoon layer are removed to make white rice, these nutrients are Although it has been lost greatly, the nutrient-enriched rice obtained by the method for producing nutrient-enriched rice according to the present invention is enriched not only in the germ and the cocoon layer but also in the endosperm, so it is refined to white rice. However, most of the enriched nutrition remains and can maintain a high nutritional value. The nutrient-enriched rice obtained by the present invention contains 5 mg / 100 g or more of γ-aminobutyric acid corresponding to 5 times or more of normal white rice even if the cocoon layer and germ are removed by drying and milling.

  Further, according to the present invention, since the rice bran with the rice husks is heated, the heat conduction to the inside of the rice grain becomes indirect, and the change of the heat inside the rice grain can be moderated. Thereby, progress of the inactivation of the enzyme by the heat | fever in the inside of a rice grain can be made loose.

  Moreover, according to this invention, if the average moisture content of the raw koji is 23% or more, nutrients such as γ-aminobutyric acid can be enriched without causing the koji to germinate. Prior to the nutrient enrichment step, the average moisture content may be 23% or higher by immersion, or the average moisture content may be 23% or higher in a high moisture state immediately after harvesting without being immersed. It may be a certain trap. Since the raw cocoons are not germinated, soaking for germination is not necessary, and the occurrence of shell cracking of the cocoons accompanying the soaking can be suppressed. Since the nutrition-enriched rice obtained by the present invention is suppressed from cracking of the body, it can reduce the possibility that it will be crushed even after scouring, drying, and milling.

  If the moisture content of the koji used as the raw material is too low, the reaction in the nutrient enrichment process may not proceed and nutrients such as γ-aminobutyric acid may not be sufficiently enriched. In the present invention, an effect can be obtained when the average moisture content of the soot is 23% or more, but in order to obtain a more remarkable effect, the average moisture content is more preferably 24% or more, and the average moisture content is 26. If it is more than%, the effect can be further enhanced.

  In general, the average moisture content of dried soot is maintained at about 14 to 16%. However, when soot with low moisture content is used as a raw material, the moisture content is reduced to an appropriate level by dipping or the like. Need to increase. The means for increasing the moisture content is not particularly limited, and various methods such as immersion, tempering, and pressurized water addition are possible. Moreover, when the raw material is a cocoon having a high moisture content like ginger, it is not necessary to add moisture. In the present invention, an effect can be obtained when the average moisture content reaches a level exceeding 23%. Therefore, even when moisture is added by dipping, germs can be germinated like conventional dipping for germination in germinated brown rice. It is not necessary to perform soaking for such a long time that the film extends.

  In addition, the conventional germinated brown rice has improved the taste problems caused by the germ and cocoon layer by mixing with normal white rice during cooking, but when mixed with normal white rice, such as γ-aminobutyric acid per weight Whereas the nutrient content has decreased and the amount of intake has been reduced, the nutrient-enriched rice of the present invention contains abundant nutrients such as γ-aminobutyric acid even if it is refined to the same degree of milling as ordinary white rice Since nutrient-enriched white rice can be obtained, it is not necessary to mix with normal white rice during cooking, and γ-aminobutyric acid can be ingested more abundantly than conventional germinated brown rice with the same amount of rice.

  Moreover, according to this invention, the installation required for manufacture of nutrient enriched rice can be simplified. That is, for example, the present invention can be implemented if there is an immersion tank filled with warm water as the heating means. Examples of other heating means include an electric heater, a gas heater, a tank equipped with an air conditioner that maintains a high-temperature and high-humidity state, a device that irradiates and heats microwaves, and a device that irradiates and heats far-infrared rays. Can do. By optimizing the scale of the facility according to the business scale and the production amount of nutrient-enriched rice, it is possible to suppress an increase in manufacturing cost. Other equipment necessary for the production of nutrient-enriched rice includes a dryer, a rice mill, a rice mill, etc., and these can use equipment generally used for producing white rice.

  The heating means is not only for heating the raw ungerminated rice cake to raise the temperature, but also for adjusting and maintaining the temperature at a predetermined temperature, and has various accompanying configurations. For example, in the case of an immersion tank, hot water supply means for supplying hot water, water supply means for supplying cold water, stirring means for stirring the inside of the immersion tank to equalize the temperature, a water temperature detection unit for detecting the water temperature of the immersion tank, and water temperature It is possible to indicate one provided with a water temperature control unit that controls the hot water supply unit and the water supply unit by comparing the water temperature detected by the detection unit with a predetermined temperature.

  In addition, when the heating temperature in a nutrient enrichment process exceeds 50 degreeC, the effect | action of an enzyme will be activated and the effect | action of nutrient enrichment will arise. This action of nutrient enrichment becomes noticeable from around 56 ° C. and further improves as the temperature rises. On the other hand, when the heating temperature exceeds 60 ° C., inactivation due to enzyme denaturation occurs, and the inactivation due to enzyme denaturation proceeds more rapidly as the temperature increases. In the present invention, when the heating temperature is lower than 56 ° C., the reactivity of the enzyme is lowered, the efficiency of nutrient enrichment is low, and the increase of nutrients such as γ-aminobutyric acid is insufficient. On the other hand, when the heating temperature exceeds 62 ° C. to 63 ° C., the reaction is lowered due to inactivation of the enzyme. Furthermore, when the heating temperature exceeds 68 ° C., there is a possibility that the nutrient enrichment may be insufficient because the reaction decrease due to the inactivation of the enzyme becomes more significant than the improvement of the nutrient enrichment effect accompanying the temperature rise. is there. For this reason, it is desirable that the heating temperature in the nutrient enrichment step be 56 ° C. or more and 68 ° C. or less, and it is particularly desirable that the heating temperature be 60 ° C. or more and 63 ° C. or less in consideration of the efficiency of nutrient enrichment.

  Moreover, in a nutrient enrichment process, if heating time is 3 minutes or more, it can enrich until content of (gamma) -aminobutyric acid becomes 5 times or more of normal white rice. Moreover, when the heating time of 15 minutes or more is provided, the content of γ-aminobutyric acid can be enriched until it becomes 10 times or more that of ordinary white rice. Until the heating time is about 30 minutes, the progress speed of nutrient enrichment is relatively large and the efficiency is high, but when the heating time exceeds 30 minutes, the nutrient enrichment is slowed and the efficiency is lowered. Furthermore, when it exceeds 60 minutes, the improvement of the effect of nutrient enrichment is remarkably slowed. Since it is wasteful in terms of time efficiency and energy efficiency to continue heating even after nutrient enrichment slows down, it is desirable that the heating time be limited to 60 minutes or less, considering the time efficiency and energy efficiency, Is more preferably 30 minutes or less.

  Furthermore, according to the present invention, the raw koji is an ungerminated koji, so that nutrients such as γ-aminobutyric acid can be added without heating the embryo by heating at a temperature of 56 ° C. or higher and 68 ° C. or lower in the nutrient enrichment process. Since it can be enriched, it is possible to suppress the consumption of nutrients for germ growth, retain nutrients such as γ-aminobutyric acid, and produce more nutrient-rich rice.

  In addition, according to the present invention, since it is not necessary to germinate the raw rice bran, it is possible to omit the long-time immersion for germination required by the conventional germinated brown rice production method. In general, in the production of germinated brown rice, it is necessary to immerse for a long time ranging from 24 to 72 hours, but according to the present configuration, nutrient-enriched rice can be produced in a very short time.

  Furthermore, the nutrient-enriched rice production method of the present invention may be “the ungerminated rice cake is undried ginger”.

  According to the present invention, it is possible to use ginger that remains undried after harvesting. Thereby, the process of drying the harvested rice cake and the process of adding moisture to the dried rice cake can be omitted, and the nutrient-enriched rice can be produced efficiently.

  In addition, if ginger is used, it is not necessary to add water by dipping or the like, and propagation of miscellaneous bacteria can be suppressed, so that facilities and processes for sterilization can be omitted. Thereby, nutrient-enriched rice can be produced at a low cost without losing quality.

  Furthermore, according to this structure, since ginger is used, the possibility of occurrence of body cracking can be greatly suppressed. When a shell crack occurs, the rice grains tend to break up when dried after milling, and also become sticky when cooked, so the taste is significantly reduced. Is easy, and it is possible to suppress a decrease in taste caused by cracking of the trunk.

  In addition, nutrient-enriched rice can be produced using raw ginger shortly after harvesting, so it is possible to shift the production time from the case where dried rice is used as raw material, improving the operating rate of equipment. Can be made. In addition, since it is possible to use rice harvested in a high moisture state as a raw material, the harvest time for rice for producing nutrient-enriched rice is intentionally shifted from the general harvest time for early harvesting or rainy weather. Or after harvesting, it is possible to suppress the load concentration of the manufacturing equipment.

  Even when ginger is used as a raw material, nutrient-enriched rice can be produced under temperature conditions in the range of 56 ° C. to 68 ° C. as in the case of using dry koji as a raw material. Although it can be made common, when using ginger, the cost of drying after harvesting can be further reduced.

In addition, the method for producing nutrient-enriched rice according to the present invention is as follows: “The ungerminated rice bran is immersed in water at a temperature higher than 0 ° C. and not higher than 10 ° C. for a predetermined time, and the average moisture content of the ungerminated rice bran is 23% or more It is good also as a structure which further has the low-temperature immersion process to raise to before the said nutrient enrichment process.

  According to this configuration, in the low-temperature soaking process that increases the moisture content of the koji prior to the nutrient enrichment process, the koji is immersed in low-temperature water of 10 ° C. or lower, which is inappropriate for germination of the koji, so The moisture content can be increased. Thereby, it is possible to suppress the possibility that nutrients such as γ-aminobutyric acid are consumed for the elongation of the embryo while adding water to the moisture content necessary for the nutrient enrichment step.

  In addition, when soaking in a temperature range of about 20 ° C. to 35 ° C. suitable for germination as in the conventional germination brown rice production process, the propagation of miscellaneous bacteria is promoted, causing the generation of off-flavors and deterioration of taste. On the other hand, in the low temperature immersion process of this structure, since it is immersed at the low temperature of 10 degrees C or less, propagation of miscellaneous bacteria can be suppressed. Thereby, a sterilization process can be abbreviate | omitted and manufacturing cost can be reduced. Moreover, the deterioration of the taste by sterilization processes, such as ozone exposure and high temperature steam exposure, can be suppressed.

  Furthermore, according to this configuration, it is possible to prepare an environment in which the water temperature is maintained at a temperature higher than 0 ° C. and lower than 10 ° C. by natural cold air during the cold season, thereby suppressing energy consumption required for producing nutrient-enriched rice. can do.

  In addition, the immersion time in the low temperature immersion process, when using an ordinary dry soot having an average moisture content of about 14 to 16% as a raw material, reaches a predetermined moisture content level by soaking for 30 hours or more. Can do. Although the immersion time varies somewhat depending on the variety, the temperature of the immersion water, etc., a sufficient water content can usually be achieved in 30 to 60 hours.

Further, the method for producing nutrient-enriched rice of the present invention is as follows: “High-temperature soaking of the ungerminated rice bran in water at a temperature of 50 ° C. or higher and 65 ° C. or lower to increase the average moisture content of the ungerminated rice bran to 23% or higher. It is good also as a structure which has a process further before the said nutrient enrichment process.

  According to this configuration, since it is immersed in high-temperature water of 50 ° C. or higher, the water content can be increased by promptly absorbing water into the bag. Compared with the case where it is immersed in water at 20 ° C. to 35 ° C. as in the general production process of germinated brown rice, the water content can be increased in a very short time. In addition, since the cocoon does not germinate in a temperature range of 50 ° C. or higher, the moisture content of the cocoon can be increased while suppressing germination. Thereby, it is possible to suppress the possibility that nutrients such as γ-aminobutyric acid are consumed for the elongation of the embryo while adding water to the moisture content necessary for the nutrient enrichment step.

  The immersion time in the high-temperature immersion process is usually 60 minutes or more, but the required time varies depending on the variety of the koji, the water content before the high-temperature immersion process, the water temperature to be immersed, etc., so that the water content can be sufficiently increased. For this, it is desirable to immerse for 90 to 180 minutes. If the high-temperature dipping process takes a long time, discoloration or a strange odor may occur in the cocoon, so that the dipping time is more preferably 120 minutes or less. Further, since the denaturation of the enzyme progresses as the water temperature exceeds 60 ° C., it is desirable to keep the water temperature in the high-temperature dipping process at 65 ° C. or less. In addition, when using a raw material such as ginger, which has a relatively high moisture content, the high-temperature dipping process is performed in a time of less than 60 minutes within a range where the average moisture content can be increased to 23% or more. You may do it.

  Moreover, you may perform a high temperature immersion process and a nutrient enrichment process continuously. That is, it is good also as a structure which adds a water | moisture content by immersing a cocoon in 56 degreeC-65 degreeC water in a high temperature immersion process, and continues immersion after the moisture content of the cocoon reaches a predetermined level, and enriches nutrients. Alternatively, the nutrient enrichment step may be performed by adjusting the water temperature to 56 ° C. to 68 ° C. after increasing the water content by immersing in water at 50 ° C. to 65 ° C. If the high-temperature dipping process and the nutrient enrichment process are continuously performed in this manner, the high-temperature dipping process and the nutrient enrichment process can be completed in a relatively short time in the same dipping bath, so that the energy required for heating can be reduced. Loss can be suppressed.

  By the way, in the nutrient enrichment process, it is necessary to heat the koji at a temperature of 56 ° C. or more while the koji of the raw material is in an average moisture content of 23% or more. Therefore, even if the immersion is performed at a water temperature of 56 ° C. to 65 ° C., which is a temperature range common to the nutrient enrichment process, in the high temperature immersion process, when the average moisture content is less than 23%, the remarkable nutrient enrichment effect Cannot be obtained. However, if the average water content becomes 23% or more during immersion at a water temperature of 56 ° C. to 65 ° C., it is possible to proceed to a nutrient enrichment step.

  Furthermore, the high-temperature dipping step may be performed in combination with dipping at a lower temperature. For example, the method for producing nutrient-enriched rice according to the present invention may include “the ungerminated rice bran is higher than 0 ° C. and lower than 10 ° C. Soaking in water at a temperature for 5 hours or more to absorb water, and then immersing in water at 50 ° C. or more and 65 ° C. or less to increase the average moisture content of the ungerminated buds to 23% or more, It can be configured to have further before the process.

  According to this configuration, after immersing in low-temperature water of 10 ° C. or lower, which is a temperature range unsuitable for germination of rice, to increase the moisture content of rice bran, it is immersed in water at 50 ° C. to 65 ° C. to obtain an average water content. The rate is further increased until it becomes 23% or more. Initially, since the soot is immersed at a low temperature that is not suitable for germination, the moisture content of the raw koji increases without germination. In addition, even in soaking at a relatively high temperature of 50 ° C. or higher, the temperature is too high for germination of the cocoons, so that the cocoons do not germinate and enter the nutrient enrichment process at an earlier stage than when immersed in low-temperature water. Moisture content can be increased to the required level. Since γ-aminobutyric acid can be enriched by the nutrient enrichment process without germinating rice, the consumption of γ-aminobutyric acid, etc. in the rice accompanying the elongation of the germ is suppressed, resulting in a richer nutrition Can provide rich nutritional rice.

  According to this configuration, the energy required for heating is reduced and the energy efficiency is improved by the step immersion step that combines the high temperature immersion step immersed in water at 50 ° C. to 65 ° C. and the step of immersion in lower temperature water. can do. In particular, when combined with a low temperature immersion process followed by a high temperature immersion process for a short time as in this configuration, energy consumption required for heating can be reduced, and propagation of germs and germ growth can be suppressed. Is possible. When the high temperature immersion process is performed after the moisture content is increased by the low temperature immersion process, the immersion time of the high temperature immersion process does not need to be 1 hour or more, and the average moisture content is increased to 23% or more in a shorter time than usual. It is possible.

  In the step dipping process, it may be soaked in “water having a temperature higher than 10 ° C. and lower than 50 ° C.” instead of “water at 50 ° C. or higher and 65 ° C. or lower”. Since the water content is increased by immersion at a low temperature of 10 ° C. or lower, it is possible to reach a predetermined water content before the germ elongation proceeds even in a temperature range suitable for germination, and 10 ° C. or lower. Nutrient-enriched rice can be produced also by a structure in which it is subsequently immersed in water at a temperature higher than 10 ° C. and lower than 50 ° C. after being immersed in water.

In addition, the method for producing nutrient-enriched rice according to the present invention is as follows: “Brown rice having germ and cocoon layers and having an average moisture content of 23% or more and not germinated,
It may be configured to have a nutrient enrichment process in which the endosperm portion of the brown rice is enriched with nutrients containing γ-aminobutyric acid by heating at a predetermined temperature of 56 ° C. or higher and 68 ° C. or lower by a heating means for a predetermined time. .

  According to this structure, nutrient-enriched rice can be produced using brown rice that has been finished with rice bran. When brown rice without rice husks is used as a raw material, heat transfer to the inside of the rice grain is faster than when rice bran is used as a raw material, so that the time required for the nutrient enrichment process can be shortened. The heating time of the nutrient enrichment process in this configuration can be 20 seconds to 60 minutes. In addition, in the case of brown rice, not only the progress of nutrient enrichment is fast, but also the heat transfer is faster than in the case of rice bran, so the efficiency reduction due to enzyme denaturation occurs earlier, so the nutrient enrichment process takes 20 seconds to It is desirable to stay within 30 minutes and even more desirably within 20 minutes where the efficiency of the nutrient enrichment process is higher.

  Even when brown rice is used as a raw material, the nutrient enrichment step can be performed after moisture is added by dipping to increase the moisture content, as in the case of rice bran. If brown rice is used as a raw material, there is no rice husk, so the water absorption is high, and the moisture content can be increased faster than rice bran.

  In addition, raw brown rice obtained by kneading raw ginger without drying can be used as a raw material. When raw brown rice is used as a raw material, heat is transferred to the germ, cocoon layer, and endosperm during heating in the nutrient enrichment process compared to when raw ginger is used as the raw material, and there is no need for water addition prior to nutrient enrichment. Therefore, the time required for producing nutrient-enriched rice can be further shortened.

  Thus, according to the present invention, the nutrient enrichment process in which the rice is heated at a high temperature that does not germinate, enriches the nutrients such as γ-aminobutyric acid in the endosperm in a short time, and semen is removed to remove the germ and the cocoon layer Even so, nutrient-enriched rice containing abundant nutrients such as γ-aminobutyric acid can be produced.

It is explanatory drawing which shows the nutrient enriched rice manufacturing method of this invention. 6 is a graph showing an experimental result of Experiment 1. 10 is a graph showing an experimental result of Experiment 2. 10 is a graph showing an experimental result of Experiment 3. 10 is a graph showing an experimental result of Experiment 5. 10 is a graph showing an experimental result of Experiment 7. 10 is a graph showing an experimental result of Experiment 10. 10 is a graph showing experimental results of Experiment 12. 14 is a graph showing an experimental result of Experiment 13.

  Hereinafter, an embodiment of the method for producing nutrient-enriched rice of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram showing the steps of the nutrient-enriched rice manufacturing method 1.

  First, the case where ginger is used as a raw material will be described. As shown in FIG. 1, first, rice is harvested in the field with a combine or the like (harvest S1) to obtain a ginger 2. The undried ginger 2 is normally in a high moisture state with an average moisture content of about 23% to 27%. After normal rice harvesting, the ginger 2 is dried with a drier to reduce the water content to a state suitable for storage. In the nutrition-enriched rice production method 1 of this example, the ginger 2 is Then, it is processed in the nutrient enrichment step S8 while being kept in a high moisture state without being dried. In the nutrient enrichment step S8, the ginger 2 is immersed in an immersion tank in which water adjusted to a temperature of 60 ° C. is stored. Immersion time is 20 minutes. Unlike the conventional method for producing germinated brown rice, the water temperature of the immersion tank in which the ginger 2 is immersed is as high as 60 ° C., and the temperature is too high for germination of the koji. Moreover, since the immersion time is as short as 20 minutes, the wrinkles do not germinate. When the nutrient enrichment step S8 is completed, no signs of germination appear apparently, but the enrichment of nutrients such as γ-aminobutyric acid is caused by the action of enzymes inside the rice grain, and the processed koji is nourished. Enrichment 籾 3. The nutrient enriched rice bran 3 contains about 10 to 23 mg / 100 g of γ-aminobutyric acid, and γ-aminobutyric acid is enriched to about 5 to about 10 times that of normal brown rice. Moreover, in the nutrient enriched rice cake 3, most of γ-aminobutyric acid is contained in the endosperm part. The nutrient-enriched koji 3 is dried with a grain dryer (drying step S9), and the moisture-enriched koji 4 can be obtained by reducing the water content to about 15%. Here, the ginger 2 corresponds to the ungerminated rice bran of the present invention, and the nutrient-enriched rice bran 3 and the dried nutrient-enriched rice bran 4 correspond to the nutrient-enriched rice of the present invention.

  The nutrient-enriched brown rice 4a obtained by mashing the nutrient-enriched koji 4 can be refined to remove the germ and the koji layer (the koji process S10), and can be made the nutrient-enriched white rice 5 that is white rice. The nutrient-enriched white rice 5 has the germ and cocoon layer removed, but the endosperm part contains abundant nutrients such as γ-aminobutyric acid. For example, the content of γ-aminobutyric acid reaches 75 to 90% of the nutrient-enriched brown rice 4a, and is enriched 10 times or more as compared with conventional white rice. Here, the nutrient-enriched white rice 5 corresponds to the nutrient-enriched rice of the present invention.

  Next, the case where the dried cocoon 8 dried (dried S2) to a moisture content suitable for storage after harvest is used as a raw material will be described. When the dried rice bran 8 is used as a raw material, the nutrient-enriched rice can be produced using the dried rice cake 8 as a raw material by increasing the water content prior to the nutrient enrichment step S8. In this case, the water enrichment step S3 is performed prior to the nutrient enrichment step S8 in order to increase the water content to a level that allows the treatment in the nutrient enrichment step S8. Although various methods can be used for the moisture enrichment step S3, the low temperature immersion step S5 is performed in the present embodiment. In the low-temperature dipping step S5, the dry soot 8 is dipped in a low-temperature dipping bath having a water temperature of about 6 ° C. for 30 to 60 hours to increase the average moisture content to 23% or more. The soaking time is determined according to various conditions such as rice varieties as raw materials. When the moisture content of the raw material reaches a predetermined level by immersion and becomes a high moisture cocoon 6, the low temperature immersion step S5 is finished, and the processing after the nutrient enrichment step S8 is performed. The temperature of the immersion water is required to be higher than 10 ° C. for germination of common cocoons, whereas the temperature of the immersion water in the low temperature immersion step S5 is around 6 ° C., which is a low temperature that is not suitable for germination. Therefore, germination of the high moisture cocoon 6 can be suppressed, and the treatment of the nutrient enrichment step S8 can be performed in an ungerminated state.

  Examples of the water enrichment step S3 include an immersion step S4, a high temperature immersion step S6, a step immersion step S7, and the like in addition to the low temperature immersion step S5. Immersion process S4 performs the process of immersing in 10-50 degreeC water whose water temperature is higher than low temperature immersion process S5. As a result, the moisture content can be increased within a shorter time than the low-temperature immersion step S5, but since the temperature range is suitable for germination of germs and propagation of miscellaneous germs, the germ extends when the treatment takes a long time. Care should be taken as there is a risk that bacteria may propagate and bacteria may develop and produce an odor. Since the high-temperature dipping step S6 is dipped at a relatively high water temperature of 50 ° C. to 65 ° C., it is possible to absorb water faster than the dipping step S4, and the average moisture content of the dried soot 8 is 23% within 3 hours. More than that. Moreover, according to the high temperature immersion process S6, since the straw is immersed in a water temperature of 50 ° C. or higher, which is higher than the temperature range suitable for germination, it is possible to suppress the elongation of the germ. The step dipping step S7 is a combination of the low temperature dipping step S5, the dipping step S4, and the high temperature dipping step S6, and performs a dipping process step by step to increase the moisture content of the soot. For example, the water content can be increased to a predetermined level by immersing in the low-temperature dipping step S5 for 12 hours and then absorbing water in the high-temperature dipping step S6 for 1 hour. According to the step immersing step S7, the water content is slowly increased while suppressing the alteration of the cocoon such as the propagation of bacteria and the elongation of the germ by performing the immersion for a long time at a relatively low temperature range. Since the water content can be increased to a predetermined level by dipping for a short time in the temperature range, the required time can be shortened compared with the case where the water content is increased to a predetermined level only by the low temperature immersion step S5. it can.

  In addition, when the average moisture content of the ginger 2 is less than a necessary level, such as when the ginger 2 has been dried due to the influence of the climate, the water enrichment process S3 is performed on the ginger 2. Thus, the water content may be improved.

  Moreover, since each process can also be performed after removing rice husks to make brown rice, after the harvesting S1, rice bran 2 may be made into raw brown rice 2a and then processed in subsequent steps. Similarly, the dried rice bran 8 may be crushed to obtain dried brown rice 8a, and then the subsequent process may be performed. When the rice husk is removed, the water absorption and heat transfer properties are increased, so that the time required for the process after the rice husk is removed can be shortened. Here, the raw brown rice 2a and the dried brown rice 8a correspond to the brown rice of the present invention.

  Hereafter, the result of the experiment regarding said Example is shown and it demonstrates in detail based on Table 1-Table 10 and FIGS. 2-9 about the effect of the nutrient enriched rice manufacturing method 1. FIG. 2 is a graph showing the experimental results of Experiment 1, FIG. 3 is a graph showing the experimental results of Experiment 2, FIG. 4 is a graph showing the experimental results of Experiment 3, and FIG. FIG. 6 is a graph showing the experimental result of Experiment 7, FIG. 7 is a graph showing the result of Experiment 10, and FIG. 8 is a graph showing the result of Experiment 12. FIG. 9 is a graph showing the results of Experiment 13.

  In the following experiments, the average moisture content of rice was measured using a general DC resistance type single grain moisture meter. Nutrients such as γ-aminobutyric acid contained in rice were analyzed at the Japan Food Analysis Center.

Experiment 1
Experiment 1 is an experiment showing that γ-aminobutyric acid is enriched in the endosperm portion by the method for producing nutrient-enriched rice of the present invention. Hereinafter, Experiment 1 will be described in detail based on Table 1 and FIG.

First, Example 1 and Example 2 will be described.
A raw ginger of Akita Komachi produced in 2007 with a high water content after harvesting was used as a raw material, and it was immersed in water at 60 ° C. to 63 ° C. for 30 minutes to enrich the nutrients. After nutrient enrichment, dehydration and drying were performed, and rice husks were removed to obtain nutrient enriched brown rice. The nutrient-enriched brown rice obtained here is Example 1, and the nutrient-enriched white rice obtained by scouring the nutrient-enriched brown rice produced under the same conditions as in Example 1 to remove the germ and cocoon layer Is Example 2. In Example 1 and Example 2, the content of γ-aminobutyric acid was measured.

  The γ-aminobutyric acid content of the nutrient-enriched brown rice of Example 1 was 18.8 mg / 100 g, and the γ-aminobutyric acid content of the nutrient-enriched white rice of Example 2 was 14.2 mg / 100 g. . The content per weight of γ-aminobutyric acid in the nutrient-enriched white rice of Example 2 corresponds to about 75% of Example 1.

Subsequently, Example 3 and Example 4 will be described.
The dried rice cake of Koshihikari produced in 2007, which had been dried after harvesting, was used as a raw material, soaked in 25 ° C. water for 25 hours to increase the water content to 28.1%, and then immersed in a dipping bath at 60 ° C. It was immersed in water for 20 minutes to enrich nutrients. After nutrient enrichment, dehydration and drying were performed, and rice husks were removed to obtain nutrient enriched brown rice. The nutrient-enriched brown rice obtained here is Example 3, and the nutrient-enriched white rice obtained by scouring the nutrient-enriched brown rice produced under the same conditions as Example 3 is Example 4. The content of γ-aminobutyric acid was similarly measured for Example 3 and Example 4.

  The γ-aminobutyric acid content of the nutrient-enriched brown rice of Example 3 was 20.4 mg / 100 g, and the γ-aminobutyric acid content of the nutrient-enriched white rice of Example 4 was 17.9 mg / 100 g. . The content per weight of γ-aminobutyric acid in the nutritionally enriched white rice of Example 4 corresponds to about 88% of the content per weight of γ-aminobutyric acid of Example 3.

Next, Comparative Example 1 and Comparative Example 2 will be described.
Comparative Example 1 and Comparative Example 2 were prepared using 2007 Koshihikari dried koji. Comparative Example 1 is brown rice obtained by immersing raw rice bran in water at 35 ° C. for 24 hours, followed by germination, dehydration and drying, and removing rice husks. It is white rice obtained by removing the straw layer. Similarly for Comparative Example 1 and Comparative Example 2, the content of γ-aminobutyric acid was measured.

  In Comparative Example 1, as in the case of conventional germinated brown rice, germination was carried out by immersion, but no nutrient enrichment step was performed, and the γ-aminobutyric acid content was 9.5 mg / 100 g. Moreover, the γ-aminobutyric acid content of the white rice of Comparative Example 2 was 2.3 mg / 100 g.

Next, Example 5 and Comparative Example 3 will be described.
After using the dried rice cake of Koshihikari produced in 2007, which had been dried after harvesting, as a raw material, the water content was increased to 25.6% by primary immersion in water at about 20 ° C. for 27 hours. Secondary immersion was performed in water at about 5 ° C. for 48 hours, and Comparative Example 3 was secondary immersion in water at about 30 ° C. for 48 hours. Example 5 and Comparative Example 3 were immersed in water at 60 ° C. for 20 minutes in a dipping bath after the completion of the secondary dipping to enrich nutrients. All were dehydrated and dried after nutrient enrichment, and rice husk was removed and refined to obtain nutrient enriched white rice.

  In Example 5, secondary immersion was performed at a low temperature that inhibited the progress of germination, and germination was not observed. On the other hand, Comparative Example 3 was subjected to secondary immersion at a temperature suitable for germination, and germination was observed. When the content of γ-aminobutyric acid was compared, Example 5 was 22.9 mg / 100 g, whereas Comparative Example 3 in which the nutrient enrichment process was performed after germination was 11.3 mg / 100 g. .

  As described above, according to the method for producing nutrient-enriched rice of the present invention, the effect of enriching γ-aminobutyric acid in the endosperm portion was obtained for both ginger and dried koji. In addition, when nutrient enrichment was performed in an ungerminated state, a greater effect was obtained than when nutrient enrichment was achieved in the germinated state.

Experiment 2
Experiment 2 is an experiment showing the relationship between the heating temperature and the effect of nutrient enrichment in the nutrient enrichment process. Hereinafter, based on Table 2 and FIG. 3, an Example demonstrates.
In Experiment 2, the dried rice cake of 2007 Koshihikari was used as a raw material, soaked in 35 ° C water for 24 hours to increase the average moisture content to about 29%, and then soaked in a soaking tank for 20 minutes for nutrient richness. Turned into. Experiments were performed on 10 groups of samples at different temperatures ranging from 55 ° C. to 68 ° C. in the nutrient enrichment process. Each sample was dehydrated and dried after nutrient enrichment, and after removing rice husks, it was scoured to further remove germs and straw layers, and the content of γ-aminobutyric acid was measured as nutrient enriched white rice.

  As a result of Experiment 2, although γ-aminobutyric acid was 4.1 mg / 100 g in the sample whose immersion temperature in the nutrient enrichment process was 55 ° C., it exceeded 5.0 mg / 100 g in the range of 56 ° C. to 58 ° C. Furthermore, in the range of 59 ° C. to 68 ° C., it was possible to obtain nutrient-enriched white rice having a γ-aminobutyric acid content exceeding 10 mg / 100 g.

  As described above, γ-aminobutyric acid could be enriched when the immersion temperature in the nutrient enrichment step was in the range of 56 ° C. or higher and 68 ° C. or lower.

Experiment 3
Experiment 3 is an experiment showing the relationship between the heating time in the nutrient enrichment process and the effect of nutrient enrichment. Hereinafter, based on Table 3 and FIG. 4, it demonstrates by an Example.
In Experiment 3, the raw kinhikari rice cake produced in 2007 was used as a raw material, immersed in 30 ° C water for 25 hours to increase the average moisture content to about 28%, and then immersed in 63 ° C water in an immersion bath. And enriched with nutrition. The experiment was conducted for one group of samples, with immersion times of 3 minutes, 5 minutes, and 7 minutes. Each sample was dehydrated and dried after nutrient enrichment, and after removing rice husks, it was scoured to further remove the germ and cocoon layer to obtain nutrient-enriched white rice. Furthermore, using dried Koshihikari rice bran produced in 2007 as a raw material, it was immersed in 35 ° C water for 24 hours to increase the average moisture content to about 29%, and then immersed in water at 60 ° C in a soaking tank. Turned into. Experiments were performed on six groups of samples with different immersion times for the nutrient enrichment process, each 15 to 180 minutes. Each sample was dehydrated and dried after nutrient enrichment, rice husks were removed, and semen was refined to further remove germs and cocoon layers to obtain nutrient-enriched white rice. The content of γ-aminobutyric acid was measured for all the above samples. Hereinafter, in consideration of the difference in the experimental conditions, a sample with an immersion time of 3 minutes to 7 minutes is referred to as “Group A”, and a sample with an immersion time of 15 minutes to 180 minutes is referred to as “Group B”.

  As a result of Experiment 3, the content of γ-aminobutyric acid was 6.0 mg / 100 g or more in all the samples of Group A and Group B, and 10 mg was obtained for the Group B samples in which the immersion time in the nutrient enrichment process was 15 minutes or more. / 100g or more.

  As described above, enrichment of γ-aminobutyric acid was confirmed in the range where the immersion time in the nutrient enrichment step was 3 minutes or more and 180 minutes or less. Moreover, after the immersion time of about 50 minutes to 60 minutes passed, even if immersion was further continued, the improvement of the effect of nutrient enrichment was not recognized.

Experiment 4 and Experiment 5
Experiment 4 and Experiment 5 are experiments showing the relationship between the moisture content of raw material cocoons and the effect of nutrient enrichment in the nutrient enrichment process. Hereinafter, based on Table 4, Table 5, and FIG. 5, it demonstrates in an Example.
In Experiment 4, the comparison was made on Example 7, Comparative Example 4 and Comparative Example 5. The dried koji from Koshihikari produced in 2007 was used as a raw material, and the dried koji was immersed in water at 25 ° C. for 25 hours in order to add moisture and increase the water content. Thereafter, dehydration and drying were performed to remove rice husks, and Comparative Example 4 was obtained as brown rice. Moreover, the brown rice obtained from what was immersed in 60 degreeC water for 20 minutes as a nutrient enrichment process after the immersion for water addition is set to Example 7, and after drying once after immersion, it is 60 degreeC as a nutrient enrichment process. The brown rice obtained from what was immersed in the water for 20 minutes was made into the comparative example 5, and content of (gamma) -aminobutyric acid was measured, respectively.

  As shown in Table 4, as a result of Experiment 4, in Example 7, the content of γ-aminobutyric acid reached 20.4 mg / 100 g, whereas Comparative Example 5 was dried before nutrient enrichment. Remained at a content of 5.8 mg / 100 g. Moreover, the content of γ-aminobutyric acid in Comparative Example 4 in which the nutrient enrichment process was not performed was 4.6 mg / 100 g.

  In Experiment 5, the dry koji from Koshihikari produced in 2007 was used as a raw material, and five soaking times were set, and the dry koji of the raw material was dipped in water at 25 ° C. for 6 hours 30 minutes to 27 hours 30 minutes, respectively, and the average water content Five groups of samples were obtained such that the rates differed from 23% to 27.4%, respectively. Each sample was immersed in water at 60 ° C. for 20 minutes as a nutrient enrichment process, dehydrated and dried, rice husks were removed, semen was removed to further remove germs and cocoon layers, and white rice contained γ-aminobutyric acid The amount was measured.

  As shown in Table 5 and FIG. 5, as a result of Experiment 5, the content of γ-aminobutyric acid reached 5.0 mg / 100 g when nutrient-enriched with an average water content of 23%. In addition, as the moisture content increases, the γ-aminobutyric acid content after nutrient enrichment also increases. At an average moisture content of 27.4%, the γ-aminobutyric acid content after nutrient enrichment reaches 14.9 mg / 100 g. Reached.

  As described above, when the nutrient enrichment process was performed in a state where the average moisture content was 23% or more, the content of γ-aminobutyric acid was significantly enriched in the endosperm (5 mg / 100 g or more). Moreover, the effect of nutrient enrichment improved as the average water content increased.

Experiment 6
Experiment 6 is an experiment showing the effect of enrichment of nutrients when the moisture content is increased by immersing the cocoon at a high temperature of 50 ° C. or higher or a low temperature of 10 ° C. or lower at which bud germination is inhibited. Hereinafter, based on Table 6, it demonstrates by an Example.
Example 9 was made from dried koshihikari rice produced in 2007, soaked in water at 51 ° C. to increase the moisture content to 28.4%, and then enriched, dried, crushed, and refined to make white rice. Is. Example 10 is also made from dry koji from Koshihikari produced in 2007 as a raw material, soaked in water at 6 ° C. to increase the water content to 24.6%, and then immersed in water at 60 ° C. for 20 minutes to enrich nutrients. It is made from white rice by drying, scouring and scouring. About the above, content of (gamma) -aminobutyric acid was measured.

  As a result of Experiment 6, the γ-aminobutyric acid content of Example 9 was 14.4 mg / 100 g, and the γ-aminobutyric acid content of Example 10 was 11.1 mg / 100 g.

  As described above, γ-aminobutyric acid is also contained in the endosperm even when the nutrient enrichment step is performed after increasing the water content by immersing in water at 10 ° C. or lower and water at 50 ° C. or higher, which is inappropriate for germination of straw. The effect of enriching was obtained.

Experiment 7
Experiment 7 is an experiment showing the relationship between the immersion time when immersed at a low temperature of 10 ° C. or lower, and the moisture content when immersed at a high temperature of 50 ° C. or higher. Hereinafter, based on Table 7 and FIG. 6, it demonstrates by an Example.
In Experiment 7, the dried cocoon produced in 2007 was used as a raw material, and the change in average moisture content with the immersion time was measured. The average moisture content before the immersion of the dried soot was 13.9%. The immersion temperatures were 10 ° C. and 50 ° C., and the average moisture content was measured as needed until 48 hours passed from the start of immersion for the 10 ° C. sample and 16 hours passed from the start of immersion for the 50 ° C. sample. Table 7 also shows the results when immersed in water at 60 ° C and 65 ° C.

  As a result of Experiment 7, when immersed in water at 10 ° C., the average moisture content reached 23.1% as measured at 31 hours. On the other hand, when immersed in water at 50 ° C., the average moisture content reached 23.8% when 2 hours and 30 minutes had elapsed. Further, when immersed in water at 60 ° C. for 1 hour and 15 minutes, the average moisture content becomes 24.2%, and when immersed in water at 65 ° C. for 1 hour and 15 minutes, the average moisture content becomes 25.4%. It was.

  As described above, when immersed in water at 10 ° C., the average moisture content exceeded 23% after an immersion time of about 30 hours. In addition, when immersed in water at 50 ° C., the average moisture content exceeded 23% within 2 hours and 30 minutes. When immersed in water at 60 ° C. and 65 ° C., the water content reached 24% or more after 1 hour and 15 minutes, and it was estimated that the average water content exceeded 23% around 1 hour. .

Experiment 8
In Experiment 8, based on Table 8, an example demonstrates the method of performing the immersion for raising the moisture content of the dried rice cake and the immersion for enrichment of nutrients by a series of immersion.
In Experiment 8, using Koshihikari rice cake produced in 2007 as a raw material, the samples were divided into three groups, soaked in water at 55 ° C to 65 ° C, respectively, and then dehydrated and dried. Then, the germ and cocoon layer were further removed, and the content of γ-aminobutyric acid was measured as nutrient-enriched white rice. The immersion time was 5 hours to 7 hours, and the average moisture content measured after the experiment was 29.9% to 30.7%.

  According to Experiment 8, the γ-aminobutyric acid content of the white rice after the experiment reached 14.8 mg / 100 g to 17.9 mg / 100 g.

  As described above, the effect of enriching γ-aminobutyric acid was obtained even when the water content was increased by immersion in water at 55 ° C. to 65 ° C.

Experiment 9
In Experiment 9, based on Table 9, the effect of nutrient enrichment when brown rice is used as a raw material will be described in Examples.
In Experiment 9, a high-moisture rice bran prepared by immersing ginger from Akita Komachi produced in 2007 in water at 27 ° C for 12 hours was used as a raw material to make high-moisture brown rice, and then immersed in water at 63 ° C in a dipping bath. Soaked for 2 to 30 seconds to enrich nutrients. Then, it dehydrated and dried, and it scoured and removed a germ and a cocoon layer further, and measured content of (gamma) -aminobutyric acid as nutrient enriched white rice.

  According to the result of Experiment 9, the immersion time was 20 seconds, and γ-aminobutyric acid was enriched to 5.5 mg / 100 g. Further, even when the immersion time was 8 seconds, 4.9 mg / 100 g, which was richer in γ-aminobutyric acid than normal white rice.

  As described above, when raw brown rice is used as a raw material, an effect of enriching γ-aminobutyric acid somewhat occurs in a nutrient enrichment process in a short time of 8 seconds, and higher nutrition is achieved by heating for 20 seconds or more. The effect of enrichment could be obtained.

Experiment 10
In Experiment 10, enrichment of nutrients of vitamins will be described in Examples based on Table 10 and FIG.
In Experiment 10, a dry koji from Koshihikari produced in 2007 was used as a raw material, soaked at a water temperature of 17 ° C. to 25 ° C. for 28 hours to make a high moisture koji, and then immersed in water at 60 ° C. for 20 minutes in a dipping bath. And enriched with nutrition. After nutrient enrichment, dehydration and drying were carried out, rice husks were removed, and scouring was performed to further remove the germ and the cocoon layer, whereby the nutrient-enriched white rice of Example 11 was obtained. Further, white rice obtained by removing the same dried rice husk as the raw material of Example 11 and further removing the germ and the cocoon layer was used as Comparative Example 6, and vitamin B1, vitamin B2, vitamin 6, vitamin Content was measured for E, folic acid, and pantothenic acid.

  As shown in Table 10 and FIG. 7, the content of vitamins of Example 11 (vitamin B1, vitamin B2, vitamin B6, vitamin E, folic acid, pantothenic acid) was 1.2 times that of Comparative Example 6. It was ~ 2.5 times.

  As described above, enrichment of nutrients of vitamins by the method for producing nutrient-enriched rice of the present invention was observed.

Experiment 11
Experiment 11 is an experiment showing the effect of nutrient enrichment when heated in air. Hereinafter, based on Table 11, it demonstrates in an Example.
In Experiment 11, the dried rice cake of Koshihikari produced in 2007 was used as a raw material. After the moisture content was increased by soaking, drained water and crushed into a high moisture brown rice, packed in a vinyl bag and kept at 63 ° C for 1 hour for nutrition. After enrichment, drying and milling were carried out to further remove the germ and cocoon layer to obtain nutrient-enriched white rice. The experiment was performed on five groups of samples in which the water content was varied by changing the immersion time. The immersion time for increasing the water content was about 8 hours to about 22 hours, respectively, and the water content was 23.5% to 27.2%.

  According to the result of Experiment 11, the γ-aminobutyric acid content of white rice was 7.4 mg / 100 g to 13.8 mg / 100 g.

  As described above, even when the raw material rice was heated in the air without being immersed in water, the effect of nutrient enrichment could be obtained.

Experiment 12
Experiment 12 is an experiment showing the relationship between the heating temperature and the nutrient enrichment effect in the nutrient enrichment process when ginger is used as a raw material. Hereinafter, based on Table 12 and FIG. 8, it demonstrates by an Example.
In Experiment 12, ginger of Koshihikari produced in 2008 was used as a raw material. The average moisture content of the raw material ginger at the start of the experiment was 26.5%, soaking was not performed to increase the moisture content, and it was directly immersed in a dipping bath for 60 minutes and heated as a nutrient enrichment process. The heating temperature in the nutrient enrichment process was set to six types of 52 ° C., 56 ° C., 60 ° C., 63 ° C., 68 ° C., and 73 ° C., and an experiment was conducted for each group of samples. Each sample was dehydrated and dried after nutrient enrichment, and after removing rice husks, it was scoured to further remove germs and straw layers, and the content of γ-aminobutyric acid was measured as nutrient enriched white rice.

  As a result of Experiment 12, the content of γ-aminobutyric acid was 1.3 mg / 100 g in the sample having a heating temperature of 52 ° C., but 5.0 mg / 100 g or more in the sample at 56 ° C. to 73 ° C. Furthermore, content of (gamma) -aminobutyric acid in the sample of 56 to 68 degreeC was 10 mg / 100g or more.

  As described above, γ-aminobutyric acid could be enriched to a predetermined level or higher by a nutrient enrichment process at an immersion temperature of 56 ° C to 73 ° C. However, the content of γ-aminobutyric acid was lower at a heating temperature of 73 ° C. than at 56 ° C. to 68 ° C., and a more excellent effect could be obtained in the range of 56 ° C. to 68 ° C.

Experiment 13
Experiment 13 is an experiment showing the relationship between the heating time in the nutrient enrichment process and the effect of nutrient enrichment. Hereinafter, based on Table 13 and FIG. 9, it demonstrates in an Example.
In Experiment 13, a raw ginger of Koshihikari produced in 2008 was used as a raw material. The average moisture content of the raw material ginger at the start of the experiment was 26.5%, soaking was not performed to increase the moisture content, and it was immersed and heated in a soaking bath as it was as a nutrient enrichment process. The heating temperature of the nutrient enrichment process is 63 ° C., and the heating time is 5 minutes, 10 minutes, 20 minutes, 30 minutes, 60 minutes, 120 minutes, and 180 minutes, respectively. It was. Each sample was dehydrated and dried after nutrient enrichment, and after removing the rice husk, the germ and the cocoon layer were further removed to measure the content of γ-aminobutyric acid as nutrient enriched white rice.

  As a result of the experiment 13, the content of γ-aminobutyric acid is 5.0 mg / 100 g or more in all samples heated for 5 minutes or more in the nutrient enrichment process, and the heating time of the nutrient enrichment process is 10 minutes or more. In the sample, it was 10 mg / 100 g or more. Furthermore, in the sample with a heating time of the nutrient enrichment process of 20 minutes or more, it was 20 mg / 100 g or more.

  As described above, even when ginger was used as a raw material, enrichment of γ-aminobutyric acid was confirmed in the range of 5 minutes to 180 minutes in the heating time in the nutrient enrichment step. However, after the heating time of about 60 minutes has elapsed, even if the nutrient enrichment is continued, the improvement of the nutrient enrichment effect is not recognized.

Experiment 14
Experiment 14 is an experiment showing the effect when nutrient enrichment is performed after the low temperature immersion step S5 and the effect when nutrition enrichment is performed after the step immersion step S7. Hereinafter, a description will be given based on Table 14.
Example 12 is made from dried koshihikari rice produced in 2008 as a raw material, and immersed in water at 1 ° C. to 5 ° C. for 40 hours as a low temperature dipping step S5 to increase the average moisture content to 23.0%. As the chemical conversion step S8, the rice is kept warm at 63 ° C. in the air for 60 minutes to enrich the nutrients, and dried, kneaded, and refined to make white rice. In Example 13, the dry koji of 2008 Koshihikari was used as a raw material, and immersed in water at 4 ° C. to 5 ° C. for 27 hours as a step dipping step S7 (low temperature dipping step S5), and further 30 in 50 ° C. water. After soaking for 30 minutes (high temperature soaking step S6), the average moisture content is increased to 23.0%, and as nutrient enrichment step S8, it is kept in the air at 63 ° C for 60 minutes to enrich the nutrients. To make white rice. About the above, content of (gamma) -aminobutyric acid was measured.

  As a result of Experiment 14, the γ-aminobutyric acid content of Example 12 was 12.9 mg / 100 g, and the γ-aminobutyric acid content of Example 13 was 12.8 mg / 100 g.

  As described above, γ-aminobutyric acid was enriched in the endosperm part when the nutrient enrichment step was performed by immersing the straw in water at 10 ° C. or lower to a moisture content of 23% or higher. Similarly, in the case where the nutrient enrichment step is performed after dipping the straw in water at 10 ° C. or lower and then increasing the water content by immersing in water at 50 ° C. or higher, the endosperm portion is rich in γ-aminobutyric acid. Turned into. Since germination does not occur even when the cocoon is immersed under a low temperature of 10 ° C. or less and a high temperature of 50 ° C. or more, γ-aminobutyric acid can be enriched in the endosperm portion of the cocoon that has not germinated.

Experiment 15
Experiment 15 is an experiment showing the time required for improving the moisture content in the step immersion step S7. In Experiment 15, the dried rice cake of Koshihikari produced in 2008 was immersed in water at 5 ° C. to 8 ° C. for 300 minutes (5 hours) to 480 minutes (8 hours) (low temperature immersion step S5), and then continuously into 50 ° C. water. It dipped for 60 minutes-120 minutes (high temperature immersion process S6), added water | moisture content, and improved the moisture content of the soot. Hereinafter, description will be given based on Table 15.

  As a result of Experiment 15, the average moisture content of the dried soot before immersion was 14.7%, while the average moisture content of the soot after soaking was 23.0% to 24.5%. After performing low temperature immersion at 5 ° C. to 8 ° C. for 300 minutes (5 hours), followed by high temperature immersion at 50 ° C. for 90 minutes, the average moisture content could be 23% or more. Similarly, when the immersion time for low temperature immersion was changed to 480 minutes (8 hours) and when the immersion time for high temperature immersion was changed to 120 minutes, the average moisture content could be 23% or more. As shown in Table 7 and FIG. 6, in the low-temperature dipping step S5, when dipped at a low temperature of 10 ° C., the average moisture content is 17.7% even when dipped for 300 minutes, and is 23% or more. It took 1860 minutes (31 hours) to become, but according to Experiment 15, the average moisture content could be 23% or more in 390 minutes (6 hours 30 minutes), and the required moisture content It was possible to significantly shorten the time required for water addition. In Experiment 15, the immersion temperature at high temperature was set to 50 ° C. However, if this temperature is set to a higher temperature, the penetration of moisture into the straw can be accelerated. Thereby, even if immersion time is 60 minutes, it is possible to set it as the average moisture content of 23% or more.

  Thus, according to the nutrient enriched rice production method 1 described above, the ginger 2 or the high moisture cocoon 6 having a rice husk and having a germ and a cocoon layer is obtained at a predetermined temperature of 56 ° C. to 68 ° C. in the nutrient enrichment step. By heating at a temperature of for a predetermined time, it is possible to produce a nutrient-enriched rice cake 3 in which nutrients such as γ-aminobutyric acid are enriched in the endosperm part.

  In addition, according to the method 1 for producing nutrient-enriched rice, the nutrient-enriched rice bran 3 is enriched not only in the germ and the cocoon layer but also in the endosperm part. 5 can leave most of the enriched nutrition. That is, the content of γ-aminobutyric acid in normal white rice is about 1 mg / 100 g, whereas the content of γ-aminobutyric acid in white rice derived from germinated brown rice of Comparative Example 2 is 2.3 mg / 100 g. In Example 2, which uses nutrient-rich white rice 5 as raw material, 14.2 mg / 100 g in Example 2, and 17.9 mg / 100 g in Example 4 which uses dry rice as a raw material, the germ and the cocoon layer are removed. Even if it is made, content of (gamma) -aminobutyric acid will be enriched 14 to 18 times equivalent compared with normal white rice.

  Moreover, according to this invention, if the average moisture content of the raw koji is 23% or more, nutrients such as γ-aminobutyric acid can be enriched in non-germinated koji. Prior to the nutrient enrichment step, it may be a high moisture cocoon 6 whose average moisture content has been increased to 23% or more by dipping, or an ungerminated ginger 2.

  In addition, according to said nutrient enriched rice manufacturing method 1, as shown in Table 5 and FIG. 5, when the average moisture content of koji is 23% or more, a remarkable nutrient enrichment effect can be obtained. The effect can be enhanced as the water content increases. In order to obtain a significant nutrient enrichment effect, the average moisture content is more preferably 24% or more, and when the average moisture content is 26% or more, the effect can be further enhanced.

  Furthermore, according to the nutrient enriched rice production method 1 described above, the raw ginger 2 and the dried koji 8 are both ungerminated koji, and by suppressing germination, γ-amino is obtained without extending the germ. Nutrients such as butyric acid can be enriched. Thereby, it is possible to suppress the consumption of nutrients due to the elongation of the germ, and to produce the nutrient-enriched white rice 5 that is richer in nutrition than the conventional germinated brown rice.

  Moreover, according to said nutrient-enriched rice manufacturing method 1, the raw ginger 2 which is not dried after harvesting can be used as a raw material. Thereby, drying S2 and moisture enrichment process S3 are abbreviate | omitted, and nutrient enriched white rice 5 can be manufactured efficiently. Moreover, since the propagation of miscellaneous bacteria can be suppressed by omitting the water enrichment step S3, facilities and processes for sterilization can be omitted.

  Further, when the raw ginger 2 is used as a raw material, it is possible to greatly suppress the possibility of shell cracking, so that it is possible to produce the nutrient-enriched white rice 5 by whitening with milled S10.

  In addition, since nutrient-enriched white rice 5 can be produced from ginger 2 shortly after harvesting, it is possible to shift the production time from the case where dried rice is used as a raw material, improving the operating rate of equipment. Can be made. In addition, since it is possible to use rice bran harvested in a high-moisture state, the harvest time of rice for producing nutrient-enriched rice is intentionally shifted from the general harvest time for early harvesting or rainy weather. Or after harvesting, it is possible to suppress the load concentration of the manufacturing equipment.

  Moreover, according to said nutrient enriched rice manufacturing method 1, in the nutrient enrichment process S8, since the rice grain with the rice husk is heated, heat transfer to the inside of the rice grain becomes gentle, and the inside of the rice grain Rapid progression of enzyme denaturation can be suppressed.

  Moreover, according to said nutrient enriched rice manufacturing method 1, the nutrient enriched white rice 5 which enriched nutrients, such as (gamma) -aminobutyric acid, can be manufactured. Unlike conventional germinated brown rice, it is not necessary to mix ordinary white rice that is deficient in γ-aminobutyric acid in order to improve the taste, so with the same amount of rice, γ-aminobutyric acid is more abundant than conventional germinated brown rice. Can be ingested.

  Moreover, according to said nutrient enriched rice manufacturing method 1, since nutrient enrichment process S8 can be performed with an immersion tank, special facilities are not required, and nutrient enriched white rice 5 is manufactured with simple facilities. Can do.

  In addition, when the heating temperature with respect to koji exceeds 68 ° C., the enzyme is denatured and inactivation proceeds rapidly, so the reaction is lowered and nutrient enrichment tends to be insufficient. On the other hand, when heating temperature is lower than 56 degreeC, the reactivity of an enzyme falls and the efficiency of nutrient enrichment falls remarkably. For this reason, it is desirable that the heating temperature in the nutrient enrichment step is 56 ° C. or more and 68 ° C. or less, and considering the nutrient enrichment efficiency and the safety margin of the quality level, the heating temperature is 60 ° C. or more and 63 ° C. or less. It is particularly desirable.

  Moreover, as shown in Experiment 3, in the nutrient enrichment step S8, if the heating time is 3 minutes or more, the content of γ-aminobutyric acid is 5 mg / 100 g or more, which corresponds to 5 times or more that of ordinary white rice. It can be enriched until. Moreover, if the heating time of 15 minutes or more is provided, the content of γ-aminobutyric acid can be enriched until it becomes 10 mg / 100 g or more. As shown in FIG. 4, the nutrient enrichment progress rate is relatively large and high in efficiency until the heating time is about 30 minutes, but when the heating time exceeds 30 minutes, the nutrient enrichment is slowed and the efficiency is lowered. In addition, the nutrient enrichment has reached its peak when the heating time is about 50 minutes to 60 minutes, and it is efficient to treat the nutrient enrichment within 60 minutes assuming a difference in characteristics depending on the variety and the like. . Moreover, it is wasteful in terms of time efficiency and energy efficiency to continue heating even after nutrient enrichment slows down. For this reason, it is desirable to limit the heating time in the nutrient enrichment step S8 to 60 minutes or less, and considering the time efficiency and energy efficiency, the heating time is more desirably 30 minutes or less.

  Furthermore, according to the nutrient enriched rice production method 1 described above, a low temperature dipping step S5 in which water is immersed in low-temperature water of 10 ° C. or less, which is unsuitable for germination of straw, and a high temperature of 50 ° C. or more, which is also unsuitable for germination of straw The moisture content of the soot can be increased by the high-temperature dipping step S6 of dipping in the water. Thereby, while increasing the moisture content up to the moisture content necessary for the nutrient enrichment step S8, the elongation of the germ can be suppressed, and the possibility that nutrients such as γ-aminobutyric acid are consumed by the germ can be suppressed.

  Moreover, according to said nutrient enriched rice manufacturing method 1, in low temperature immersion process S5, since it immerses at the low temperature of 10 degrees C or less, propagation of miscellaneous bacteria can be suppressed. Thereby, a sterilization process can be abbreviate | omitted and manufacturing cost can be reduced. In the low-temperature dipping step S5, the dipping time varies somewhat depending on the variety, the water temperature of the dipping water, and the like, but usually a sufficient water content can be achieved in 30 to 60 hours.

  Furthermore, according to the method 1 for producing nutrient-enriched rice, it is possible to prepare an environment in which the water temperature is maintained at a temperature higher than 0 ° C and lower than 10 ° C by natural cold air during the cold season. Energy consumption required for production can be suppressed.

  Moreover, according to said nutrient-enriched rice manufacturing method 1, it is also possible to quickly increase the water content by allowing the raw material koji to quickly absorb water by the high-temperature dipping step S6 in which it is immersed in high-temperature water at 50 ° C. or higher. In addition, since the cocoon does not germinate in a temperature range of 50 ° C. or higher, the moisture content of the cocoon can be increased while suppressing germination. Thereby, it is possible to suppress the possibility that nutrients such as γ-aminobutyric acid are consumed for the elongation of the embryo while adding water to the moisture content necessary for the nutrient enrichment step S8. The dipping time in the high temperature dipping step S6 is usually 60 minutes or more, but the required time varies depending on the raw material varieties, the water content before the high temperature dipping step S6, the dipping water temperature, etc. In order to increase the rate, it is desirable to immerse for 90 minutes to 180 minutes. If the high-temperature dipping step S6 takes a long time, discoloration or a strange odor may occur in the rice, so the dipping time is more preferably 120 minutes or less.

  Moreover, you may perform high temperature immersion process S6 and nutrient enrichment process S8 continuously. That is, in the high-temperature dipping step S6, soot may be soaked in water at 56 ° C. to 65 ° C. to add moisture, and after the moisture content of the soot reaches a predetermined level, soaking may be continued to enrich the nutrients. Alternatively, the nutrient enrichment step S8 may be performed by adjusting the water temperature to 56 ° C. to 68 ° C. after increasing the water content by immersing in water at 50 ° C. to 65 ° C. If the average water content is 23% or more during the immersion when the immersion is performed at a water temperature of 56 ° C. to 65 ° C. in the high temperature immersion step S6, the water temperature is maintained as it is and the immersion is continued as the nutrient enrichment step S8. It can also be enriched by nutrition. If the high temperature immersion step S6 and the nutrient enrichment step S8 are continuously performed in this manner, the steps up to the nutrient enrichment step S8 can be completed in a relatively short time in the same immersion tank, and the energy required for heating can be reduced. Loss can also be suppressed.

  Moreover, according to said nutrient enriched rice manufacturing method 1, the raw brown rice 2a which kneaded the raw ginger 2 with undried can also be utilized as a raw material. When raw brown rice 2a is used as a raw material, it is not necessary to perform the water enrichment step S3 for adding water, and the heating time of the nutrient enrichment step is set to 20 seconds to 60 minutes, thereby further reducing the time required for producing the nutrient enriched rice. Can do.

  Furthermore, also when dry brown rice 8a is used as a raw material, the nutrient enrichment step S8 can be performed after increasing the water content by immersion, as in the case of the dried rice bran 8. When brown rice is used as a raw material, the water content can be increased faster than rice bran because of its high water absorption.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And changes are possible.

  That is, according to the nutrient-enriched rice production method 1 described above, the method for increasing the moisture content of the dried rice bran 8 by immersion has been shown, but the means for increasing the moisture content is not particularly limited, and tempering, pressurized water addition, etc. Various methods are possible. According to the pressurized water, the water content can be increased quickly.

  Moreover, according to said nutrient enriched rice manufacturing method 1, although the temperature-controllable immersion tank was shown as a heating means, as an other usable heating means, an electric heater, a gas heater, a high temperature and high humidity state are used. Examples include a tank provided with an air conditioning facility to be maintained, a device that irradiates and heats microwaves, and a device that irradiates and heats far infrared rays. By selecting such equipment according to the business scale and the production amount of nutrient-enriched rice, it is possible to efficiently produce the nutrient-enriched white rice 5 and reduce the cost.

  Furthermore, the nutrient-enriched white rice 5 can adjust the degree of semen as with normal white rice or brown rice. That is, when the nutrient-enriched brown rice 4a is refined to the nutrient-enriched white rice 5 in the milling S10, it can be divided into five minutes or seven minutes. As a result, a variety of nutrition-enriched rice can be provided and applied to various cooking forms and products.

  Moreover, it is also possible to manufacture the rice processed food which processed the nutrient enriched white rice 5. FIG. For example, it is possible to provide cooked rice products obtained by cooking white rice into retort packaging, and processed rice foods such as rice flour, rice miso, and rice crackers. Since γ-aminobutyric acid is not lost by cooking rice, nutrient-enriched rice is also suitable as a raw material for processed foods, and can provide various processed rice foods enriched with nutrients such as γ-aminobutyric acid. Is possible.

  Moreover, in said embodiment, the rice cake which dried after completion | finish of nutrient enrichment process S8, and obtained the nutrient enriched brown rice 4a, and rice cake rice cake in an undried state before nutrient enrichment process S8 The raw brown rice 2a or the high-moisture brown rice 6a is shown and dried after the nutrient enrichment step S8. However, the present invention is not limited to this, and the moisture content is predetermined at the time of the nutrient enrichment step S8. The hulling and drying can be performed at any time during the process.

  Moreover, Example 10 of Experiment 6 and Example 12 of Experiment 14 are merely examples, and the moisture content may be further increased by immersing for a longer time, or the temperature may be increased to 10 ° C., which is higher than that of the Example. The immersion time may be shortened by immersion in water at a near temperature.

  Moreover, in Experiment 5 and Experiment 6, although the example which performed the water enrichment by the low temperature immersion process S5 of 10 degrees C or less and the high temperature immersion process S6 of 50 degrees C or more was shown, low temperature immersion process S5 and high temperature immersion process S6 were shown. It is also possible to perform water enrichment by the combined step immersion step S7. The moisture content of raw rice bran and brown rice varies depending on the drying and storage conditions after harvesting, and the moisture content varies even with rice of the same variety that is harvested at the same time, so optimal soaking conditions for water enrichment Since the water absorption varies greatly depending on the case, the low temperature immersion step S5 alone may take a very long time to increase the moisture content, whereas the high temperature immersion step S6 requires 1 hour to Even for about 2 hours and 30 minutes, the water content can be sufficiently increased. Since the low temperature immersion step S5 has an advantage that the propagation of various bacteria can be suppressed, the low temperature immersion step S5 performs immersion until reaching a predetermined level, for example, an average water content of 20%, and then performs the high temperature immersion step S6. If the water content is increased by the step immersing step S7 for reaching a water content of at least%, the dipping time can be shortened while suppressing the propagation of germs. Further, in both the low temperature immersion step S5 and the high temperature immersion step S6, since germ growth is suppressed, the consumption of nutrients can be reduced. This step immersion step S7 is not necessarily a combination of the low temperature immersion step S5 and the high temperature immersion step S6, and the immersion step S4 at a temperature in the range of 10 ° C. to 50 ° C. is performed after the low temperature immersion step S5. Good. In this case, the energy consumption required for heating can be reduced by lowering the immersion temperature, and the possibility of discoloration or a strange odor due to immersion at a high temperature can be suppressed.

  As shown in Example 13, according to the step immersion step S7, the moisture content can be increased to 23% or more in a shorter time than in the case of the low temperature immersion step S5 (Example 12). Nutrient-enriched rice containing abundant γ-aminobutyric acid can be produced as in the case of increasing the water content. Example 13 is merely an example, and the nutrient enrichment effect can be further enhanced by further increasing the water content.

S5 Low temperature dipping process S6 High temperature dipping process S8 Nutrition enrichment process 1 Nutrition enriched rice production method 2 Ginger (ungerminated rice bran)
2a Raw brown rice (brown rice)
3. Nutrient enriched rice (nutrient enriched rice)
3a Nutrient-enriched brown rice (Nutrient-enriched rice)
4 Dried nutrient-enriched rice cake (nutrient-enriched rice)
4a Nutrient-enriched brown rice (Nutrient-enriched rice)
5 Nutrient-enriched white rice (Nutrient-enriched rice)
8 Dry rice cake (ungerminated rice cake)
8a Dried brown rice (brown rice)

Patent No. 3841801

Claims (5)

Non-germinated buds that have an average moisture content of 23% or more and have not germinated,
It has a nutrient enrichment step of enriching nutrients containing γ-aminobutyric acid in the endosperm portion of the ungerminated cocoon by heating at a predetermined temperature of 56 ° C. to 68 ° C. for a predetermined time by a heating means. And nutrition-enriched rice production method.   The method for producing nutrient-enriched rice according to claim 1, wherein the ungerminated rice bran is undried ginger. The low-temperature soaking step of immersing the ungerminated buds in water at a temperature higher than 0 ° C. and not higher than 10 ° C. for a predetermined time, and increasing the average moisture content of the ungerminated buds to 23% or more than the nutrient enrichment step The method for producing nutrient-enriched rice according to claim 1 or 2, further comprising before. A step of immersing the ungerminated buds in water at a temperature of 50 ° C. or higher and 65 ° C. or lower, and increasing the average moisture content of the ungerminated buds to 23% or more, further before the nutrient enrichment step, The method for producing nutrient-enriched rice according to any one of claims 1 to 3, wherein the method comprises: Brown rice that has germ and has an average moisture content of 23% or more and has not germinated.
It has a nutrient enrichment step of enriching nutrients containing γ-aminobutyric acid in the endosperm portion of the brown rice by heating for a predetermined time at a predetermined temperature of 56 ° C. or higher and 68 ° C. or lower by a heating means. , Nutrition-enriched rice production method.

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