JP3417910B2 - Low phosphorus special polished rice and method for producing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to specialized medical rice,
In particular, the present invention relates to inexpensive specially-polished rice (hereinafter referred to as low-phosphorus specially-polished rice), which is suitable for dialysis patients or the like who cannot reduce the phosphorus concentration in blood, has a small amount of protein reduction, and has a low phosphorus content, and a production method thereof.

[0002]

2. Description of the Related Art Currently, there are about 200,000 dialysis patients in Japan, and it is a big problem that these people cannot reduce the phosphorus concentration in blood. That is, 80% of dialysis patients
People with serum phosphorus have a normal upper limit of 5 mg / 10 cm ³
Is always above. And the continuation of this hyperphosphatemia
It is associated with many bone-related complications that develop about 10 years after the start of dialysis. Therefore, in order to lower the blood phosphorus concentration, a phosphorus adsorbent such as calcium carbonate is taken, but the effect is not very sufficient.

After all, it is most effective to reduce the phosphorus intake from the diet in order to lower the blood phosphorus concentration. Incidentally, in Japan, the amount of phosphorus ingested from normal cooked rice is 4 out of 800 mg ingested daily.
It is estimated to account for 340 mg, which corresponds to 2.5%. Therefore, it is extremely important to reduce the phosphorus concentration in cooked rice, and conventionally, low phosphorus rice was produced by significantly increasing the polishing rate as compared with regular white rice. This is because the phosphorus content in the rice particles is higher as it gets closer to the surface layer than inside the rice.

Generally, the phosphorus content in 100 g of rice is about 300 mg in the case of brown rice and 120 in the case of normal white rice.
~ 150 mg. Therefore, the phosphorus concentration of white rice should be 1 /
In order to reduce it to about 3, the polishing rate must be about 50%, and the amount that can be effectively used as food is halved, which is extremely expensive. In addition, increasing the polishing rate in this way reduces the protein content, and the taste is poor,
It becomes difficult to eat. Therefore, conventionally, the polishing rate was 30 to 4
5% forced to not give suppressed, Therefore, it has been difficult to reduce the phosphorus concentration in 60 m g or less in rice 100 g.
Even if the polishing rate is suppressed in this way, the conventional low phosphorus specially polished rice was expensive, about twice the normal rice price. Nevertheless, when a low-protein rice food is desired, it is of some value, but it also has the drawback that the protein content is too low for dialysis patients.

Therefore, the inventors of the present invention have conducted extensive studies to obtain low-phosphorus rice that is inexpensive and has a small amount of protein loss. As a result, flattening reduces the polishing rate to about 25% and mixes sodium chloride and acetic acid. The present invention has found that by extracting the phosphorus in rice particles by immersing it in a solution, it is possible to obtain inexpensive low phosphorus rice having a protein content higher than conventional and having a taste similar to that of ordinary white rice, and the present invention. Reached

[0006]

SUMMARY OF THE INVENTION Therefore, a first object of the present invention is to provide low phosphorus special rice which is inexpensive and has a higher protein content than the conventional special rice. A second object of the present invention is to provide an inexpensive method for producing low-phosphorus specially-polished rice in which the phosphorus content in 100 g of rice is 50 mg or less and the protein content is 5 g or more.

[0007]

Means for Solving the Problems The above-mentioned objects of the present invention are as follows: the original rate of brown rice is 65% or more, and the protein content in 100 g of rice is 100 %.
The content of phosphorus is 5g or more, and the content of phosphorus contained in 100g of rice is 50mg or less, and low phosphorus specially polished rice, and the polishing rate is 25% by using a polishing machine.
After flattening brown rice and polishing as shown below, it is treated with a mixed aqueous solution of sodium chloride and acetic acid, and then washed with water.
It was achieved by a method for producing low phosphorus specially milled rice characterized by being dried.

In the present invention, the original rate of brown rice is represented by 100 K ³ where K is the rice polishing coefficient. In addition, the rice polishing coefficient is a value obtained by dividing the average thickness of the back part of rice grains after polishing by the average thickness of the back part of brown rice, and is a coefficient well known in the art. In order to keep the original shape rate of the specially-polished rice of the present invention at 65% or more, it can be realized by flattening the brown rice and suppressing the polishing rate within 25%. The polishing is performed on unpolished rice, but by removing the flattening of the back part of the rice grain, which is thickest, the flattened rice is more flat than the normal high-whiteness polished rice, and the original rice shape is kept at 65% or more. This makes it possible to improve the phosphorus extraction efficiency by the treatment described below.

The above flattened polishing can be carried out by using a polishing machine such as a brewer's rice polishing machine or the like and performing multi-stage polishing while appropriately controlling the processing conditions. Multi-stage Wasei
For example, the pressure in the polishing pot and the rotation speed of the cutting blade are changed every 5% polishing rate. In addition, it is preferable that the rice milling machine is a fine roll and the atmospheric pressure and the number of revolutions are computer-controlled during the polishing. For example, when starting polishing of brown rice, the inside of the kettle is adjusted to 60 to 65 atm, the rotation speed of the cutting blade is adjusted to 350 to 550 rotations / minute, and these values are appropriately adjusted according to the progress of polishing. This adjustment can be computer controlled. The original rate of the polished rice of the present invention thus obtained is about 69.42% at about 80% of polished rice (about 20% of polished rice) from the thickness measurement of the raw material rice measured by the slit type comb. Is.

By suppressing the polishing rate in this way, it is possible to easily increase the protein content to 5 g or more per 100 g of the polished rice obtained. In the present invention, the milled rice thus obtained is used as basic rice, and then phosphorus contained in the basic rice is extracted. In this extraction, a mixed aqueous solution of a salt of a strong acid, a strong base and a weak acid is used, but in the present invention, it is preferable to use a mixed aqueous solution of sodium chloride and acetic acid from the viewpoint of economy and safety.

In this case, the concentration of sodium chloride is preferably within 4% by weight, and the concentration of acetic acid is preferably 0.5% by weight or less. If the concentration of sodium chloride exceeds 4% by weight, the taste of the low phosphorus specially-polished rice obtained becomes salty, which is not preferable. Similarly, when the concentration of acetic acid is 0.
If it exceeds 5% by weight, the specially-polished rice obtained has a vinegar taste, which is not preferable. The lower the concentration of the treatment liquid, the longer the treatment time, but this treatment time depends on the treatment temperature.
The treatment temperature is preferably 15 to 40 ° C, more preferably 33 to 37 ° C, most preferably 35 to 36 ° C.

The phosphorus extraction treatment from the basic rice in the present invention is preferably carried out until the water content of the rice reaches 19 to 20% by weight. If the water content of the rice is more than 20% by weight, cracking and splitting of the rice will occur when the water content of the rice is returned to the water content before treatment by drying after drying, which is not preferable. Usually, the water content of basic rice is 13 to 14% by weight,
Although the moisture content of 13 to 14% by weight is finally restored by the drying after the phosphorus extraction treatment, the moisture content of the basic rice does not have to be 13 to 14% by weight. The water content of the specially-polished rice as a product of the present invention may be 15% by weight or less,
It is particularly preferably 13% by weight or more.

When the basic rice is immersed in the treatment liquid at about 20 ° C.,
The treatment liquid does not permeate uniformly from the rice grain surface,
It penetrates from a weak surface tissue such as the germ removal part toward the center of the rice grain with a score-like streak, and the softening and swelling of the rice grain progresses considerably in about 30 minutes and continues to swell until about 2 hours. , It doesn't change much after that. The higher the treatment temperature, the faster the water absorption, but the higher the treatment temperature, the larger the water absorption.

The target water content of 20% by weight in the present invention is reached in a few minutes even if the temperature of the treatment liquid is about 20 ° C., so that it is preferable to gently stir in order to efficiently extract phosphorus. If you do not mix gently, rice grains will be damaged, so it is necessary to mix carefully. When the phosphorus extraction treatment is not performed in a batch method but in a continuous method in which the treatment liquid is allowed to pass for a certain period of time, stirring may not be performed. Alternatively, the treatment liquid may be circulated and poured onto rice for a certain period of time. In any case, the phosphorus content per 100 g of rice is 50 m by fully performing the phosphorus extraction treatment in the range where the water content does not exceed 20% by weight.
It can be g or less. The content of phosphorus is
It is a value measured by an absorptiometry.

In the present invention, the drying process after the above-mentioned phosphorus extraction treatment is performed in the following three stages. That is, the first
The stage is a stage in which only the rice grain surface is rapidly dried by hot air of 50 ° C. to 80 ° C. The second stage is a aging stage in which the temperature is kept at 40 ° C. or lower and the water absorption rate of the whole rice grain is made uniform. And the third stage is 15% by weight or less, preferably 1
50 ° C.-8 until the desired moisture content of 3-14% by weight
This is a step of drying again with hot air of 0 ° C. According to this drying method, it is possible to prevent the rice grain from cracking or splitting.

[0016]

EFFECTS OF THE INVENTION The low phosphorus specially refined rice of the present invention produced as described above has a low polishing rate, so that not only a small amount of protein is lost but also a taste similar to that of ordinary white rice can be obtained. Since its phosphorus content is significantly lower than that of conventional specially-polished rice, it is suitable as medical rice for dialysis patients. In addition, since the polishing rate is close to that of regular white rice, it is inexpensive, and it has become possible for the entire family together with the patient to surround the same table.

[0017]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. Example 1. Using a sake brewing machine, Koshihikari brown rice was flat-processed and polished until the polishing rate reached 20% by weight. At the time of the flattening process, the polishing is started under the condition that the pressure inside the kettle is 60 atmospheric pressure and the rotation speed of the cutting blade is 500 rotations / minute, and the above atmospheric pressure and rotation speed are adjusted as shown in the table below according to the progress of the polishing accuracy. did. When the thickness of the resulting milled rice was measured with a slit type comb, the original shape ratio was 69.42%.

The obtained polished rice is used as basic rice, and the basic rice is immersed in a mixed aqueous solution of 3.5% by weight of sodium chloride and 0.4% by weight of acetic acid at 35 ° C. for 8 minutes to remove phosphorus in the rice. Was extracted. Next, the rice grain was dried by hot air at 70 ° C. until the surface became white, and then left in the air at 35 ° C. for about 2 hours until the water content in the rice grain became about 14 wt%. The shape of the specially-polished rice of the present invention thus obtained is
As shown in FIG. 1, the prototype ratio measured by the slit type comb was 69.5%. As a result of an analytical test, the phosphorus content was 47 mg and the protein content was 5.3 g per 100 g of rice. When the low phosphorus specially refined rice of the present invention thus obtained was actually used as cooked rice, the phosphorus content in 100 g of cooked rice was 19 mg, and
Not only is it shiny and has no odor, but it is the same as ordinary rice and can be eaten deliciously. As is clear from these results, the specially-polished rice of the present invention is not only inexpensive because it has a low polishing rate, but also has a small amount of protein reduction even though the phosphorus content is lower than that of conventional specially-polished rice. , Proved to be particularly useful as medical rice for dialysis patients.

[Brief description of drawings]

FIG. 1 is a view showing the shapes of the specially-polished rice of the present invention, as well as the shapes of ordinary polished rice and conventional specially-polished rice, for explaining the prototype ratio of the specially-polished rice of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-9203 (JP, A) JP-A-7-170923 (JP, A) JP-A-11-243879 (JP, A) JP-A-3- 50487 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A23L 1/10

Claims (8)

(57) [Claims] 1. A plasma ratio of brown rice is not more than 65%, US
Low phosphorus specially-polished rice characterized in that the protein content in 100 g is 5 g or more and the phosphorus content in 100 g of rice is 50 mg or less. 2. The low phosphorus specially polished rice according to claim 1, which is obtained by polishing brown rice such that the polishing rate is 25% or less. 3. The polishing rate is 25% or less using a polishing machine.
The brown rice is processed into a flat shape like
Treated with a mixed solution of sodium chloride and acetic acid, then washed with water and dried.
And a method for producing low-phosphorus special-polished rice characterized by: 4. A mixed solution of the above sodium chloride and acetic acid.
The treatment according to claim 3, wherein the treatment is performed at 15-40 ° C.
Method for producing low phosphorus special rice. 5. The mixed solution of sodium chloride and acetic acid is 4
The method for producing low phosphorus specially polished rice according to claim 3 or 4, which is a mixed solution of a sodium chloride aqueous solution of not more than 5% by weight and an acetic acid solution of not more than 0.5% by weight. 6. A process according to the mixed solution, the water content in the rice performed until about 19 to 20 wt%, claim 3-5
4. A method for producing low phosphorus specially milled rice according to any one of 1. 7. Drying after washing with water is carried out by rapidly drying only the surface of the rice grain with hot air at 50 to 80 ° C., aging at 40 ° C. or lower, and then 50 to 80 until the water content becomes 15% by weight or lower.
The method for producing low-phosphorus special rice according to any one of claims 3 to 6, which is dried again with hot air at ℃. 8. The method for producing low phosphorus special rice according to claim 7, wherein the ripening temperature is 35 to 36 ° C.