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Method for decreasing heavy metal content in cereal powder

A heavy metal and powder technology, which is applied in the field of reducing heavy metal content in grain powder, can solve the problems of increasing metal pollution of rice powder and its flour products, and achieve the effects of avoiding re-pollution, improving safety, and improving reduction efficiency

Inactive Publication Date: 2016-03-30
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to reports, the heavy metal content of rice processing will be greatly increased, which will also increase the metal pollution of rice powder and its noodle products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Take 20g of early rice powder with a cadmium content of 0.3549mg / kg (dry basis), add 200mL of water, add citric acid equivalent to 0.2% of the water weight, stir evenly, and obtain a feed liquid;

[0024] (2) Ultrasonic treatment is performed on the feed liquid obtained in step (1), the ultrasonic frequency is 40kHz, the time is 2h, and the ultrasonic treatment process controls the temperature at 25±2°C;

[0025] (3) Press filter the feed liquid treated in step (2), wash it with water, repeat the operation 3 times, each time the pressure is 3MPa, and each time the water consumption is 200mL;

[0026] (4) Drying the early rice obtained after the treatment in step (3), the drying temperature is 50° C., and the drying time is 8 hours.

[0027] After inspection, the cadmium content of the treated early rice powder was 0.0325 mg / kg (dry basis), and the cadmium removal rate reached 90.8%.

Embodiment 2

[0029] (1) Take 20g of rice powder with a cadmium content of 0.7537mg / kg (dry basis), add 200mL of water, add citric acid equivalent to 0.2% of the water weight, stir evenly, and obtain a feed liquid;

[0030] (2) Ultrasonic treatment is performed on the feed liquid obtained in step (1), the ultrasonic frequency is 30kHz, the time is 2h, and the ultrasonic treatment process controls the temperature at 30±2°C;

[0031] (3) Press filter the feed liquid treated in step (2), wash it with water, repeat the operation 3 times, each time the pressure is 2MPa, and each time the water consumption is 200mL;

[0032] (4) Drying the rice obtained after the treatment in step (3), the drying temperature is 50° C., and the drying time is 8 hours.

[0033] After inspection, the cadmium content of the treated rice powder was 0.1258mg / kg (dry basis), and the cadmium removal rate reached 83.3%.

Embodiment 3

[0035] (1) Take 20g of rice powder with a cadmium content of 0.8710mg / kg (dry basis) rice machine No. 5, add 200mL of water, add tartaric acid equivalent to 0.4% of the water weight, stir evenly, and obtain a feed liquid;

[0036] (2) Ultrasonic treatment is performed on the feed liquid obtained in step (1), the ultrasonic frequency is 20kHz, the time is 3h, and the ultrasonic treatment process controls the temperature at 35±2°C;

[0037] (3) Press filter the feed liquid treated in step (2), wash it with water, repeat the operation 3 times, each time the pressure is 4MPa, and each time the water consumption is 200mL;

[0038] (4) Dry the No. 5 rice obtained from the rice machine after the treatment in step (3), the drying temperature is 50° C., and the drying time is 8 hours.

[0039] After inspection, the cadmium content of the treated Miji No. 5 rice powder was 0.1434 mg / kg (dry basis), and the cadmium removal rate reached 83.5%.

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Abstract

A method for decreasing heavy metal content in cereal powder includes the following steps of firstly, conducting a reduction reaction, wherein cereal powder polluted by heavy metal is weighed, water accounting for 5-10 times of the weight of the cereal powder is added, a heavy metal reduction agent accounting for 0.1-1.0% of the weight of the added water is added, the mixture is evenly stirred, and material liquid is obtained; secondly, conducting ultrasonic reduction, wherein ultrasonic processing is conducted on the material liquid obtained in the first step, the ultrasonic frequency is 20-50 kHz, time is 1-4 h, and the temperature is controlled at 20-40 DEG C in the ultrasonic processing process; thirdly, conducting washing, wherein filter pressing is conducted on the liquid material processed in the second step, and the liquid material is washed with water; fourthly, conducting drying, wherein cereal obtained after the processing in the third step is dried. By means of the method, the problem that at present, the content of heavy metal such as cadmium, chromium, lead, mercury, arsenium and copper in powder of cereal such as rice exceeds the standard can be effectively solved.

Description

technical field [0001] The invention relates to a method for reducing heavy metal content in grain powder. Background technique [0002] Heavy metals are substances that are harmful to the human body and can enter the food chain through crops. [0003] Rice is one of the most important grain varieties in my country, and more than 65% of the population in my country takes rice as a staple food. Studies have shown that rice is easy to enrich the heavy metals in the soil and air, thus indirectly threatening human health. Rice has the characteristics of strong absorption of heavy metals such as cadmium, chromium, lead, mercury, arsenic, and copper. This inherent characteristic also explains the occasional heavy metal pollution incidents in rice in recent years. According to reports, the heavy metal content of rice processing will be greatly increased, which will also increase the metal pollution of rice powder and its noodle products. At present, there is an urgent need for a...

Claims

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Application Information

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IPC IPC(8): A23L5/20A23L5/30A23L7/10
CPCA23V2002/00A23V2300/48A23V2300/02
Inventor 林亲录徐友志白婕郭志萍杨涛吴伟吴晓娟周玲
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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