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Method for extracting edible rice starch and rice protein from broken rice with excessive pesticide residues

A technology of rice starch and rice protein, applied in the field of food processing, can solve the problems of wasting energy, damage product quality, reduce product yield, etc., and achieve the effects of good safety, increased yield, and reduced residual protein

Active Publication Date: 2021-11-26
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the rice is harvested, some pesticides still remain on the rice. At the same time, during the storage of the rice, it is easy to be contaminated by fungi and produce mycotoxins such as aflatoxin.
In the rice milling process, as many as 10% of broken rice will be produced, and the broken rice contains more rice husks and pesticide residues, which greatly reduces the utilization value of broken rice. Now broken rice is mostly used for animals. In the feed, even if the protein and starch are extracted, these harmful substances will be brought into the finished product along with the preparation and extraction of rice protein and rice starch. If they are not handled correctly, the safety of the product will be affected
[0003] Patent CN94110384.6 mentions that ammonia or chlorine water or sodium hypochlorite is used to remove aflatoxin in soy sauce raw materials; patent CN201410417726 uses ultraviolet rays to catalyze the degradation of pesticide residues; Reduce product yield; UV catalytic degradation of pesticide residues also has the problem of wasting energy

Method used

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  • Method for extracting edible rice starch and rice protein from broken rice with excessive pesticide residues
  • Method for extracting edible rice starch and rice protein from broken rice with excessive pesticide residues
  • Method for extracting edible rice starch and rice protein from broken rice with excessive pesticide residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Raw material crushing: the ratio of rice to water to liquid is 1:6 (g / L), soaked in 0.1% alkali solution, and use a colloid mill to crush the raw materials, and after crushing, the rice milk is then ultrafinely crushed by an ultrafine pulverizer;

[0037] (2) rice milk reaction: stirring the rice milk obtained in step (1) for 6 hours;

[0038] (3) The first oxidative degradation of pesticide residues and toxins: adjust the pH of the rice milk obtained in step (2) to 12, add sodium hypochlorite and chlorine dioxide, the molar ratio of the two is (1:5), and make the available chlorine concentration 50ppm , and stirred for 30min;

[0039] (4) centrifugation: the rice milk obtained in step (3) is centrifuged in a centrifuge, and the light phase obtained is protein liquid, and the heavy phase is starch;

[0040] (5) Oxidative degradation of pesticide residue toxins for the second time: adjust the pH of the protein solution obtained in step (4) to 8, add hydrogen peroxid...

Embodiment 2

[0050] (1) Raw material pulverization: the ratio of rice to water to liquid is 1:6 (g / L), soaked in 0.1% alkali solution, and use a colloid mill to pulverize the raw materials.

[0051] (2) rice milk reaction: stirring the rice milk obtained in step (1) for 6 hours;

[0052] (3) The first oxidative degradation of pesticide residues and toxins: adjust the pH of the rice milk obtained in step (2) to 10, add sodium hypochlorite and chlorine dioxide, the molar ratio of the two is (1:1), and the available chlorine concentration is 50ppm , and stirred for 30min;

[0053] (4) centrifugation: the rice milk obtained in step (3) is centrifuged in a centrifuge, and the light phase obtained is protein liquid, and the heavy phase is starch;

[0054] (5) Oxidative degradation of pesticide residue toxins for the second time: adjust the pH of the protein solution obtained in step (4) to 8, add hydrogen peroxide to make its mass concentration 1%, and stir for 30 minutes; add water to the star...

Embodiment 3

[0064] (1) Raw material crushing: the ratio of rice to water to liquid is 1:6 (g / L), soaked in 0.1% alkali solution, and use a colloid mill to crush the raw materials, and after crushing, the rice milk is then ultrafinely crushed by an ultrafine pulverizer;

[0065] (2) rice milk reaction: stirring the rice milk obtained in step (1) for 6 hours;

[0066] (3) The first oxidative degradation of pesticide residues and toxins: adjust the pH of the rice milk obtained in step (2) to 10, add sodium hypochlorite and chlorine dioxide, the molar ratio of the two is (1:5), and make the available chlorine concentration 30ppm , and stirred for 30min;

[0067] (4) centrifugation: the rice milk obtained in step (3) is centrifuged in a centrifuge, and the light phase obtained is protein liquid, and the heavy phase is starch;

[0068] (5) Oxidative degradation of pesticide residue toxins for the second time: adjust the pH of the protein solution obtained in step (4) to 8, add hydrogen peroxid...

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Abstract

The invention discloses a method for extracting edible rice starch and rice protein from broken rice with excessive pesticide residues. According to the method, pesticide residues such as isoprothiolane and hexaconazole and mycotoxins such as aflatoxin are oxidized and degraded into non-toxic substances through oxidizing agents such as sodium hypochlorite, chlorine dioxide and hydrogen peroxide, disulfide bonds of protein are opened at the same time, stable sulfonic acid groups with high solubility are formed, protein dissolution is increased, the yield is increased, residual protein in starch is reduced, and protein and starch products with better safety are obtained.

Description

technical field [0001] The invention relates to a method for extracting edible rice starch and rice protein from broken rice with excess pesticide residues, belonging to the technical field of food processing. Background technique [0002] As a major crop in China and the staple food consumed by 65% ​​of the country's population, rice is undoubtedly an extremely important crop. As the most common staple food on the Chinese table, rice also provides most of the plant protein that Chinese people consume in a day. As the only grain that is exempt from allergy tests, the application of rice protein and starch is also increasing with the development of industrial technology. In order to ensure the yield of rice, it is necessary to use pesticides to ensure the growth of rice. After the rice is harvested, some pesticides still remain on the rice. At the same time, during the storage of the rice, it is easy to be contaminated by fungi and produce mycotoxins such as aflatoxin. In ...

Claims

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Application Information

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IPC IPC(8): C08B30/04C08H1/00A23J1/12
CPCC08B30/042C08H1/00A23J1/12
Inventor 王韧秦禹冯伟薛晴予王涛张昊
Owner JIANGNAN UNIV
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