CN104698033B - It is a kind of to predict the chewiness after rice stick is made in rice method and application - Google Patents

It is a kind of to predict the chewiness after rice stick is made in rice method and application Download PDF

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CN104698033B
CN104698033B CN201510119055.9A CN201510119055A CN104698033B CN 104698033 B CN104698033 B CN 104698033B CN 201510119055 A CN201510119055 A CN 201510119055A CN 104698033 B CN104698033 B CN 104698033B
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rice
chewiness
content
heat
amylose content
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CN104698033A (en
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梁兰兰
谭龙飞
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Guangzhou City Polytechnic
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Guangzhou City Polytechnic
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Abstract

The chewiness after rice stick is made in rice method and application are predicted the invention discloses a kind of.This method determines the heat enthalpy value, amylose content and chalkiness degree of rice sample first, the numerical value measured is contrasted with amylose content/chalkiness degree/heat content-chewiness relation table again, as long as heat enthalpy value, amylose content and chalkiness degree all fall within the number range in amylose content/chalkiness degree/heat content-chewiness relation table, that is, it can determine that chewiness of the rice sample under predetermined processing conditions is interval.Chewing sexual intercourse due to heat enthalpy value, amylose content, chalkiness degree three-dimensional condition with determining rice vermicelli under processing conditions is highly stable, so as to which the method that the present invention is provided has very high accuracy rate, it is applied in rice stick processing, is conducive to obtaining the good rice stick of chewiness.

Description

It is a kind of to predict the chewiness after rice stick is made in rice method and application
Technical field
It is more particularly to a kind of to predict that rice is made the method for the chewiness after rice stick and answered the invention belongs to field of food With.
Background technology
After rice grinds, suitable quantity of water is added, by gelatinization process such as boiling or extruding, ground rice paste is had certain Plasticity, is then made the various dry rice flour bar such as vertical bar, square or rectangle, is a kind of common food-processing method.
Due to the difference of the conditions such as rice variety, the place of production, planting environment, the qualities of the rice vermicelli processed also has aobvious Write difference.Some rice suitable for making rice sticks, rice stick flexible, chewiness are good, by consumers welcomed;Some rice are not Suitable for making rice stick, rice stick lacking toughness, elasticity, the chewiness after processing is poor, causes stockpiling of unsold product.
Distinguish the rice of different qualities, with determine its whether suitably processing rice stick be in quality of rice noodles control one it is important Work.
Under prior art, judged using manual type.By taking the processing of long-grain rice flour as an example, specific practice is, by Xian Meter Yu Shui is mixed according to proper proportion, on electric cooker after boiling, and sense organ taste is carried out by skilled engineer, according to Situations such as elasticity of rice, toughness, predicts the chewiness of dry rice flour.This Forecasting Methodology excessively relies on the experience of judgement person, mistake Rate is very high.
In addition to the above method, detect the amylose content of rice, thus predict the method for rice stick chewiness also compared with It is common.It is believed that rice of the amylose content higher than more than 20% is suitable for making the ground rice that hardness is high, chewiness is good Bar.This Forecasting Methodology the disadvantage is that, (amylose content is between 20~30% for the close rice of amylose content Between) still have significant deviation.
The content of the invention
The primary and foremost purpose of the present invention is to overcome the shortcoming and deficiency of prior art that ground rice is made there is provided one kind prediction rice The method of chewiness after bar.This method step is simple, and accurately can be predicted using rice sample to be processed This kind of rice is processed as vermicelli, be especially processed as containing less moisture dryness food bars (be usually water content 15% with Under) chewiness, be easy to be widely popularized in food-processing industry.
Another object of the present invention is to provide the application that the method for the chewiness after rice stick is made in the prediction rice.
The purpose of the present invention is achieved through the following technical solutions:It is a kind of to predict the side that the chewiness after rice stick is made in rice Method, comprises the following steps:
(1) rice sample is crushed, obtains rice powder;Rice powder is measured using differential scanning calorimeter, is obtained To temperature-hot-fluid uptake curve of rice powder;According to temperature-hot-fluid uptake curve, the heat content of rice powder is calculated Value;
(2) amylose content and chalkiness degree of rice sample are measured;
(3) by above-mentioned heat enthalpy value, amylose content and chalkiness degree and amylose content/chalkiness degree/heat content-nozzle Chew sexual intercourse table to contrast, as long as heat enthalpy value, amylose content and chalkiness degree all fall within amylose content/chalkiness degree/heat Number range in enthalpy-chewiness relation table, that is, can determine that chewiness of the rice sample under predetermined processing conditions is interval.
Rice sample described in step (1) is long-grained nonglutinous rice.
The degree of crushing described in step (1) is preferably that rice powder can cross 100 mesh sieves.
The step of application differential scanning calorimeter described in step (1) measures rice powder is preferably as follows:With water by powder The rice powder for being broken to 100 mesh is made into the solution of mass percent 30%, is placed in closed tubule, stands 24 hours, Ran Houqu Go out to be partially placed into the high platens of DSC, from 30 DEG C of scannings to 100 DEG C, 10 DEG C/min of heating rate obtains temperature-hot-fluid uptake Curve.
Temperature-hot-fluid uptake curve described in step (1), the starting point line using endothermic peak two ends is baseline, baseline The area of above endothermic peak is heat absorption peak area (mJ), and the heat content that per dry matter (g) is absorbed is heat enthalpy value (J/g).
Amylose content and described chalkiness degree described in step (2) are measured according to national standard method.
Amylose content/chalkiness degree/heat content-chewiness relation table described in step (3), is the heat for reflecting rice The interval of the chewiness after dry rice flour bar is made in enthalpy, amylose content, chalkiness degree and the rice under predetermined processing conditions One table of comparisons of corresponding relation, the table of comparisons is obtained by pilot experiments.
When described rice is early makes long-grained nonglutinous rice, described amylose content/chalkiness degree/heat content-chewiness relation table is excellent Choosing is as follows, and the numerical intervals listed in table include its region end-point data:
Table 1
Amylose content (%) Chalkiness degree (%) Heat content (J/g) Chewiness (g.mm)
20.0~21.9 0~5 7~13 4000~5000
22.0~23.9 0~9 9~11 4000~5000
24.0~25.9 0~3 5~8 4000~5000
26.0~27.9 0~6 7~11 4000~5500
28.0~29.9 0~15 8~10 4500~5500
The method that the chewiness after rice stick is made in above-mentioned prediction rice can apply to make ground rice with polished rice or long-grained nonglutinous rice In the processing of bar, it is particularly suitable for use in the processing that the rice using amylose content higher than 20% makes dry rice flour bar.
Rice stick of the described dry rice flour bar preferred water content below 15%.
The present invention has the following advantages and effect relative to prior art:Ground rice is made in the prediction rice that the present invention is provided The method of chewiness after bar, the chalkiness degree and amylose content of rice is measured using national standard method, and use differential amount Thermal scanner measures the heat enthalpy value of this kind of rice;Above-mentioned chalkiness degree, amylose content and heat enthalpy value and pilot experiments are obtained Amylose content, chalkiness degree, heat content-chewing sexual intercourse be compared, determine the rice in the determination processing conditions Under chewiness.Nozzle due to heat enthalpy value, amylose content, chalkiness degree three-dimensional condition with determining rice vermicelli under processing conditions Chew sexual intercourse highly stable so that this method has very high accuracy rate.
Brief description of the drawings
Fig. 1 is the flow chart for the method that the chewiness after rice stick is made in the prediction rice that embodiment 1 is provided.
Fig. 2 is temperature-hot-fluid uptake curve map spectrogram that embodiment 1 is obtained.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited In this.
Embodiment 1
The chewiness, refers to the description rice obtained after the rice stick compression properties after being boiled using Texture instrument measurement The index of vermicelli toughness and chewy texture, equal to the area of extrusion graph.Chewiness value is higher, and rice stick toughness is better, and chewy texture is better. Specific determination step refers to the blue orchid paddy storage time of beam and kind arranges powder qualitative effects study mechanism doctorate to rice Paper 4.1.4.1 extrudes part of detecting.
Take a morning make long-grained nonglutinous rice sample (sample not used for formulate following amylose content/chalkiness degree/heat content- Chewiness relation table), it is determined as follows, continuous mode is as shown in Figure 1:
(1) step S101, measures the chalkiness degree that the morning makes long-grained nonglutinous rice:According to GB/T 17891-1999《High quality paddy》Regulation Method measure rice chalkiness degree, obtain the rice chalkiness degree be 8.3%.
(2) step S102, makes long-grained nonglutinous rice sample by the morning and powdered long-grain rice flour is made:Long-grained nonglutinous rice sample is made with morning to be processed Product, crush by FSJ-1 types grain experiment pulverizer, then cross 80 mesh sieves;Then whirlwind pulverising mill (FOSETECATOR) is used Mill, it is ensured that obtained ground rice 99.6% can cross 100 mesh sieves, obtain powdered long-grain rice flour.
(3) step S103, measures the amylose content of above-mentioned long-grain rice flour:According to GB/T 15683-2008《Rice is straight The measure of chain content of starch》Defined method measures the amylose content of rice, and obtaining the Rice Amylose content is 23.4%.
(4) step S104, measures the heat enthalpy value of above-mentioned long-grain rice flour:The above-mentioned long-grain rice flours of 10g are made into quality hundred with water Divide the solution than 30%, be placed in closed tubule, stand 24 hours, then take out a little, be put into the high platens of DSC;Differential is swept It is that 10 DEG C/min of heating rate obtains a temperature-hot-fluid uptake from 30 DEG C of scannings to 100 DEG C to retouch calorimeter measurement parameter The A curves of curve, i.e. Fig. 2.The abscissa of the figure is temperature, and ordinate is hot-fluid uptake.According to the endothermic curve of starch, with The starting point line at endothermic peak two ends is baseline, and the area of baseline above endothermic peak is heat absorption peak area (mJ), per dry matter (g) heat content absorbed is heat enthalpy value (J/g).It is 63.244mJ to measure this long-grain rice flour heat absorption peak area;Heat enthalpy value is 9.972J/g。
(5) step S105, the amylose content/chalkiness degree/heat content-chewiness relation table obtained according to pilot experiments, Determine that the morning of the examples representative makes long-grained nonglutinous rice and the chewiness after rice stick is made.
According to the morning of a large amount of different cultivars, batch make long-grain rice flour it is determined that processing conditions under the experiment that carries out, can be with Amylose content/chalkiness degree/heat content-chewing sexual intercourse under the processing conditions is obtained, table of comparisons description is early to make long-grained nonglutinous rice Amylose content, chalkiness degree, heat enthalpy value it is interval and it is early make long-grained nonglutinous rice it is determined that predetermined processing conditions under ground rice is made after nozzle The interval corresponding relation of chewing property.In some determination processing conditions, (long-grained nonglutinous rice is crushed to 80 mesh, is added water according to 150% ratio, stirring After uniform, Rice & peanut milk is poured into prefabricated container, at ambient pressure boiling 10~15 minutes, is cooled to after normal temperature and cuts shaping) under, fit For the early specific table of comparisons for making long-grained nonglutinous rice as shown in table 2 (data area in table includes its end-point data):
Table 2
Amylose content (%) Chalkiness degree (%) Heat content (J/g) Chewiness (g.mm)
20.0~21.9 0~5 7~13 4000~5000
22.0~23.9 0~9 9~11 4000~5000
24.0~25.9 0~3 5~8 4000~5000
26.0~27.9 0~6 7~11 4000~5500
28.0~29.9 0~15 8~10 4500~5500
Note:In the table, chewiness more than 4000 all represents that chewiness is good, and numerical value is higher, and chewiness is better.
It is 23.4% according to the amylose content that the present embodiment is obtained, chalkiness degree is 8.3%, and heat enthalpy value is 9.972J/g Situation, thus it is speculated that the chewiness of this kind of rice stick is between 4000~5000g.mm, and actually measured chewiness (presses above-mentioned detection side Method detection ground rice gel) it is 4400g.mm.
Comparative example 1
Take a morning make long-grained nonglutinous rice sample (sample not used for formulate following amylose content/chalkiness degree/heat content- Chewiness relation table), it is determined as follows, continuous mode is as shown in Figure 1:
(1) step S101, measures the chalkiness degree that the morning makes long-grained nonglutinous rice:According to GB/T 17891-1999《High quality paddy》Regulation Method measure rice chalkiness degree, obtain the rice chalkiness degree be 37.4%.
(2) step S102, makes long-grained nonglutinous rice sample by the morning and powdered long-grain rice flour is made:Long-grained nonglutinous rice sample is made with morning to be processed Product, crush by FSJ-1 types grain experiment pulverizer, then cross 80 mesh sieves;Then whirlwind pulverising mill (FOSETECATOR) is used Mill, it is ensured that obtained ground rice 99.6% can cross 100 mesh sieves, obtain powdered long-grain rice flour.
(3) step S103, measures the amylose content of above-mentioned long-grain rice flour:According to GB/T 15683-2008《Rice is straight The measure of chain content of starch》Defined method measures the amylose content of rice, and obtaining the Rice Amylose content is 26.7%.
(4) step S104, measures the heat enthalpy value of above-mentioned long-grain rice flour:The above-mentioned long-grain rice flours of 10g are made into quality hundred with water Divide the solution than 30%, be placed in closed tubule, stand 24 hours, then take out a little, be put into the high platens of DSC;Differential is swept It is that 10 DEG C/min of heating rate obtains a temperature-hot-fluid uptake from 30 DEG C of scannings to 100 DEG C to retouch calorimeter measurement parameter Curve.The abscissa of the figure is temperature, and ordinate is hot-fluid uptake.According to the endothermic curve of starch, with endothermic peak two ends Starting point line is baseline, and the area of baseline above endothermic peak is heat absorption peak area (mJ), the heat that per dry matter (g) is absorbed Enthalpy is heat enthalpy value (J/g).It is 63.679mJ to measure this long-grain rice flour heat absorption peak area;Heat enthalpy value is 10.14J/g.
(5) step S105, the amylose content/chalkiness degree/heat content-chewiness relation table obtained according to pilot experiments, Know that the morning of the examples representative makes long-grained nonglutinous rice, although amylose content, heat enthalpy value are interval in table 2, but chalkiness degree is not or not the area of table 2 Between, predict that the not higher than 4000g.mm of the chewiness after rice stick is made in the sample.Actually detected as shown by data, the sample chewiness For 3000g.mm.
Long-grained nonglutinous rice is made by the morning of separate sources to be tested, many experiments show, the corresponding relation in table 2 is relative constancy 's.It therefore, it can early make long-grained nonglutinous rice chalkiness degree, amylose content and heat enthalpy value by determining, some accurately speculated by the table The specific early chewiness for making the dry rice flour that long-grained nonglutinous rice sample is obtained under the processing conditions.According to the estimated value of chewiness, it can sentence Disconnected this kind of rice whether the rice stick of suitable fabrication good toughness.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims (3)

1. a kind of predict the method that the chewiness after rice stick is made in rice, it is characterised in that comprises the following steps:
(1) rice sample is crushed, obtains rice powder;Rice powder is measured using differential scanning calorimeter, obtains big Temperature-hot-fluid uptake the curve at ground rice end;According to temperature-hot-fluid uptake curve, the heat enthalpy value of rice powder is calculated;
(2) amylose content and chalkiness degree of rice sample are measured;
(3) by above-mentioned heat enthalpy value, amylose content and chalkiness degree and amylose content/chalkiness degree/heat content-chewiness Relation table is contrasted, if heat enthalpy value, amylose content and chalkiness degree all fall within amylose content/chalkiness degree/heat content- Number range in chewiness relation table, that is, can determine that chewiness of the rice sample under predetermined processing conditions is interval;
Rice sample described in step (1) is long-grained nonglutinous rice;
The degree of crushing described in step (1) is that rice powder can cross 100 mesh sieves;
The step of application differential scanning calorimeter described in step (1) measures rice powder is as follows:100 mesh will be crushed to water Rice powder be made into the solution of mass percent 30%, be placed in closed tubule, stand 24 hours, then take out and be partially placed into In the high platens of DSC, from 30 DEG C of scannings to 100 DEG C, 10 DEG C/min of heating rate obtains temperature-hot-fluid uptake curve;
Temperature-hot-fluid uptake curve described in step (1), the starting point line using endothermic peak two ends is baseline, more than baseline The area of endothermic peak is heat absorption peak area, the heat content that per dry matter is absorbed as heat enthalpy value;
Amylose content/chalkiness degree/heat content-chewiness relation table described in step (3), be reflect rice heat enthalpy value, The interval correspondence pass of the chewiness after dry rice flour bar is made in amylose content, chalkiness degree and the rice under predetermined processing conditions One table of comparisons of system, the table of comparisons is obtained by pilot experiments;When described rice is early makes long-grained nonglutinous rice, described amylose The numerical intervals listed in content/chalkiness degree/heat content-chewiness relation table such as following table, table include its region end-point data:
2. predict that the application of the method for the chewiness after rice stick is made in rice described in claim 1, it is characterised in that:It is described pre- Survey rice and the method for the chewiness after rice stick is made applied to the processing that rice stick is made of long-grained nonglutinous rice.
3. the application of the method for the chewiness after rice stick is made in prediction rice according to claim 2, it is characterised in that:Institute The rice stated is the rice that amylose content is higher than 20%;Described rice stick is dry rice flour bar.
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