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Method of reducing heavy metals of cereals

A heavy metal and grain technology, applied in the field of grain and grain processing by-products, can solve the problem of high cost, achieve low cost, good effect, and reliable technical process

Active Publication Date: 2015-04-22
HUAZHONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a better effect of removing heavy metal residues, but the cost is higher

Method used

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  • Method of reducing heavy metals of cereals
  • Method of reducing heavy metals of cereals
  • Method of reducing heavy metals of cereals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Example of removing heavy metals from rice

[0043] The initial test value of the raw rice sample used in the test: starch content 78.52%, moisture content 12.23%, crude protein content 7.21%, cadmium content 0.382mg / kg, lead content 0.165mg / kg, arsenic content 0.085mg / kg, mercury content 0.013 mg / kg, nickel content 0.71mg / kg, copper content 3.592mg / kg.

[0044] Step 1: Take 1000g of the above-mentioned raw rice, wash it with 1500g of tap water, and wash it twice;

[0045] Step 2: Add 4000 g of soaking solution 1 (0.4% NaOH solution) to the washed rice, stir and soak for 3 hours at room temperature to fully swell the rice, and grind the swollen rice with a colloid mill for 100 Mesh sieve;

[0046] Step 3: Sedimentation and separation of the slurry to obtain precipitate 1, adjust the pH of the supernatant to 2.0 with 0.1N hydrochloric acid, and dialyze in a hydrochloric acid solution of pH 2.0 with a molecular weight cut-off of 1000D for 24 hours to allow hea...

Embodiment 2

[0051] Example 2 Comparison of the removal of heavy metals from rice by different soaking solutions 1

[0052] The method in Example 1 was adopted to remove heavy metals in rice, and the raw rice used in the test was the same sample as in Example 1. Just change the soaking solution 1 in Step 2 of Example 1, and the effects of different soaking solutions 1 on removing heavy metals from rice are shown in Table 1.

[0053] Table 1 Treatment effect of different soaking solution 1

[0054]

[0055] Table 1 shows that, using the selected soaking solution 1 to carry out the corresponding heavy metal removal treatment, the heavy metal content in the obtained product all meets the national standard (see the national standard of the People's Republic of China, standard number GB 2762-2012), wherein, 0.4% NaOH The effect of removing heavy metals from solution is relatively good, and the protein recovery rate is also the highest.

Embodiment 3

[0056] Example 3 Comparison of removing heavy metals from rice protein under different membrane separation conditions

[0057] The method in Example 1 was adopted to remove heavy metals in rice, and the raw rice used in the test was the same sample as in Example 1. Just change the conditions of the supernatant membrane separation and removal of heavy metals in Step 3 of Example 1, wherein the volume of the supernatant is concentrated to about 35% by ultrafiltration, and the removal effect of heavy metals is shown in Table 2.

[0058] Table 2 Effects of different membrane separations on heavy metal removal

[0059]

[0060] Table 2 shows that in the selected dialysis bag and ultrafiltration membrane, the product recovery rate decreases with the increase of the molecular weight cut-off, and the effect of removing heavy metals is not much different, and the cadmium and lead heavy metal contents of the obtained rice protein all meet the national standards (See National Standar...

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Abstract

The invention belongs to the technical field of deep processing of cereals such as rice, and relates to a method of reducing heavy metal residues of cereals such as rice polluted by heavy metals such as cadmium and lead and processing byproducts. The method comprises the following steps: by taking the heavy metal polluted cereals such as rice, wheat and corn and cereal processing byproducts such as rice bran and bran as raw materials, purifying, cleaning, soaking by a soaking liquid, defibrinating and settling and separating to obtain a supernate; carrying out pH regulation, settlement or membrane separation, washing, settlement and drying to obtain cereal proteins; carrying out washing, pH adjustment, filtration and drying on precipitate to obtain cereal starch or polysaccharide; or carrying out washing, pH adjustment, protease hydrolysis, washing, filtration and drying to obtain cereal starch or polysaccharide. The permissible content of heavy metals such as cadmium, lead, arsenic, mercury and nickel in products such as cereal proteins, cereal starch or polysaccharide prepared by the method provided by the invention satisfies the national standard.

Description

technical field [0001] The invention belongs to the technical field of deep processing of rice and other grains, and specifically relates to a method for reducing heavy metals such as cadmium or lead to pollute rice and other grains and by-products of grain processing. The content of heavy metals such as cadmium, lead, arsenic, mercury, nickel and copper remaining in protein, starch or polysaccharides. Background technique [0002] Due to geological causes and human activities, heavy metals such as cadmium will pollute farmland ecosystems such as rice fields, wheat fields, and corn fields. Heavy metals are ingested by the human body through the food chain, posing a great threat to human health. The pollution of heavy metals such as cadmium in farmland in China, Japan, India, South Korea and other Southeast Asian countries is particularly serious, and other countries in the world are also polluted to varying degrees. The entry of cadmium and other heavy metals into people's ...

Claims

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Application Information

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IPC IPC(8): A23L1/015A23L1/10A23L5/20A23L7/10
CPCA23L5/25A23L5/27A23L5/276A23V2002/00A23V2300/40A23V2300/14A23V2300/26A23V2300/10
Inventor 赵思明豁银强熊善柏陈颖潘洪冬
Owner HUAZHONG AGRICULTURAL UNIVERSITY
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