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A method for removing heavy metal lead and cadmium in rice dregs protein

A rice dregs protein and heavy metal technology, which is applied to the preparation method of peptides, chemical instruments and methods, peptides, etc., can solve the problems of high heavy metal lead and cadmium content, which restricts the processing and reuse of rice dregs protein, and achieves easy exposure and convenience The effect of removal and protein structure stretching

Active Publication Date: 2021-07-20
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

A method for removing lead and cadmium in rice dregs protein, the multiple carboxylic acid groups of complexing agent citric acid and EDTA‑2Na can effectively complex heavy metal lead and cadmium. After the rice dreg protein is treated with ethanol and hydrogen peroxide, some heavy metal lead and cadmium are complexed with citric acid in acidic conditions. After washing with water, most of the heavy metal lead and cadmium are complexed with EDTA-2Na under high temperature conditions. After repeated washing, The rice dregs protein with low content of lead and cadmium can be obtained, the contents of which are respectively 0.076 and 0.011 mg / kg, which can effectively solve the problem of excessive lead and cadmium content in the existing rice dregs protein. The invention is simple in operation and remarkable in effect, can safely and effectively remove heavy metal lead and cadmium in rice dreg 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 Patents(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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