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Removal method of heavy metal lead and cadmium in rice residue protein

A technology of rice dregs protein and heavy metals, which is applied to the preparation method of peptides, chemical instruments and methods, organic chemistry, etc., can solve the problems of restricting the processing and reuse of rice dregs protein, high content of heavy metals lead and cadmium, and achieve easy removal and easy removal. Effects of exposure, protein structure stretching

Active Publication Date: 2018-11-23
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of heavy metals lead and cadmium in rice dregs protein is still high, which restricts the processing and reuse of rice dregs protein

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Crush the purchased rice dregs protein, and pass through an 80-mesh sieve to obtain rice dregs protein with uniform and fine particles.

[0017] (2) Take 200 g of sifted rice dreg protein, add 1600 mL of absolute ethanol and mix evenly, stir and react in a water bath at 25 °C at a stirring speed of 200 rpm, react for 1 h, and filter with filter cloth. Add 2000 mL of deionized water to the filtered rice dreg protein, stir evenly, and filter through a filter cloth to obtain the filter dreg protein.

[0018] (3) Add 2000 mL of hydrogen peroxide with a mass concentration of 3% and mix evenly. Stir and react in a water bath at 25°C at a stirring speed of 200 rpm, react for 1 hour, filter with a filter cloth, and add 2000 mL of the filtered rice dreg protein Stir and wash with deionized water evenly once, and filter through filter cloth to obtain hydrogen peroxide treated filter residue protein.

[0019] (4) Add 2000 mL of deionized water and 5 g of citric acid solid to ...

Embodiment 2

[0023] Embodiment two comparative test

[0024] (1) Crush the purchased rice dregs protein, and pass through an 80-mesh sieve to obtain rice dregs protein with uniform particles.

[0025] (2) Take 200 g of sieved rice dreg protein, add 2000 mL of deionized water and 5 g of EDTA-2Na solid and stir evenly, and adjust the pH of the solution to 7.5 with a sodium hydroxide solution with a concentration of 1 mol / L. Stir the reaction in a water bath environment at 60-80°C, the stirring speed is 200-300 rpm, the reaction time is 2-4 h, filter, add 2000 mL of deionized water to the filtered protein, stir and wash once, filter, and then Add 2000 mL of deionized water, stir well and wash with water once.

[0026] (3) After filtering, dry in an oven at 70°C, and after drying, crush and pack to obtain low-content heavy metal lead rice dreg protein with the same apparent properties as the original rice dreg protein.

[0027] (4) The low-content heavy metal lead and cadmium rice slag prote...

Embodiment 3

[0028] Embodiment three comparative test

[0029] (1) Crush the purchased rice dregs protein, and pass through an 80-mesh sieve to obtain rice dregs protein with uniform and fine particles.

[0030] (2) Take 200 g of sieved rice dreg protein, add 2000 mL of deionized water and 5 g of citric acid solid, stir evenly to fully dissolve the citric acid solid, and adjust the pH of the solution with a hydrochloric acid solution with a concentration of 1 mol / L 5.0, stirred and reacted in a water bath at 50°C at a stirring speed of 200 rpm, reacted for 1 hour, filtered, added 2000 mL of deionized water to the filtered rice dregs protein, stirred evenly and washed twice, filtered to obtain the filter residue protein.

[0031] (3) Add 2000 mL of deionized water and 5 g of EDTA-2Na solid to the filter residue protein and stir evenly. Use a sodium hydroxide solution with a concentration of 1 mol / L to adjust the pH of the solution to 7.5. Stir the reaction, the stirring speed is 200-300 rp...

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PUM

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Abstract

The invention discloses a removal method of heavy metal lead and cadmium in rice residue protein. Citric acid as a complexing agent and multiple carboxyl groups of EDTA-2Na can be effectively in complexing with the heavy metal lead and cadmium. After rice residue protein is subjected to treatment with ethyl alcohol and hydrogen peroxide, the citric acid is in complexing with a part of the heavy metal lead and cadmium under the acid condition, the EDTA-2Na is continuously in complexing with most of the heavy metal lead and cadmium under the high-temperature alkaline condition after washing, andwashing is performed for multiple times to obtain the rice residue protein with low lead content and low cadmium content being 0.076 mg / kg and 0.011 mg / kg respectively, so that the problem of too high lead content and cadmium content in the existing rice residue protein can be effectively solved. The removal method provided by the invention is simple to operate and remarkable in effect, can safely and effectively remove the heavy metal lead and cadmium in the rice residue protein and is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of rice product processing, in particular to a method for removing lead and cadmium in rice dreg protein. Background technique [0002] Food safety is closely related to everyone and has always been one of the government's most important issues. Rice is the main food crop in my country, and its heavy metal content is an important safety indicator. Although my country's economic development has made great progress, the problem of environmental pollution has become increasingly prominent, including the pollution of agricultural land. Rice is currently the main ration crop for people in our country, and its safety issues are directly related to the health status of every person in the country. [0003] For rice, the main types of heavy metals contained in it are lead and cadmium. Excessive intake of lead can damage the human nervous system, lead to neurasthenia, indigestion, big head and other symptoms, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07K1/14
CPCC07K1/14
Inventor 刘成梅戴涛涛罗舜菁陈军钟业俊李俶刘伟胡健
Owner NANCHANG UNIV
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