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A kind of method for removing lead in rice dregs protein
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A technology for rice dregs protein and protein is applied in the field of removing lead in rice dregs protein, and can solve the problems of restricting the processing and reuse of rice dregs protein and high content of heavy metal lead.
Active Publication Date: 2021-07-20
NANCHANG UNIV
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Problems solved by technology
However, the heavy metal lead content in rice dregs protein is still high, which restricts the processing and reuse of rice dregs protein
Method used
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Embodiment 1
[0013] (1) Crush the purchased rice dregs protein, and pass through an 80-mesh sieve to obtain rice dregs protein with uniform and fine particles.
[0014] (2) Take 200 g of sifted rice dregs protein, add 2000 mL of 3% hydrogenperoxide and mix evenly, stir and react in a water bath at 25°C at a stirring speed of 200 rpm, react for 1 hour, and filter with filter cloth , the filtered rice dreg protein was added to 2000 mL of deionized water, stirred and washed evenly once, and filtered through a filter cloth to obtain the filter residue protein.
[0015] (3) Add 2000 mL of deionized water and 5 g of citric acidsolid to the filter residue protein, stir evenly to fully dissolve the citric acid solid, adjust the pH of the solution to 3.0 with a hydrochloric acid solution with a concentration of 1 mol / L, and stir in a water bath at 50 °C Reaction, the stirring speed is 200 rpm, react for 1h, filter, add 2000 mL of deionized water to the filtered rice residue protein, stir and wash...
[0020] (1) Crush the purchased rice dregs protein, and pass through an 80-mesh sieve to obtain rice dregs protein with uniform particles.
[0021] (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 9.0 with a sodiumhydroxide 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 evenly, wash once with water to obtain protein residue.
[0022] (3) The filtered filter residue protein is dried in an oven at 70°C, and the dried filter residue protein is crushed and packaged to obtain low-content heavy metal lead rice dreg protein with the same apparent properties as the original rice dreg prot...
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Abstract
A method for removing lead in rice dregs protein, the multiple carboxylic acid groups of the complexing agent citric acid and EDTA-2Na can effectively complex the heavy metal lead. After the rice dregs protein is treated with hydrogenperoxide, some heavy metal lead is complexed with citric acid in acidic conditions, and most of the heavy metal lead is complexed with EDTA-2Na under high temperature and alkaline conditions after washing with water. After repeated washing, low lead content can be obtained 0.072 mg / kg rice dregs protein can effectively solve the problem of excessive lead content in the existing rice dregs protein. The invention has simple operation and remarkable effect, can safely and effectively remove the heavy metal lead in the 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 productprocessing, in particular to a method for removing lead in rice dregs protein. Background technique [0002] Lead is a heavy metal element with accumulation and multi-affinity, which can cause damage to human nervous, hematopoietic, digestive and immune systems. Lead damage is internationally recognized as the number one killer that endangers the development of children's nervous system. If the blood lead content in children exceeds 100 ug / L, the intelligence index will drop by 10-20 points. Therefore, the heavy metal lead has been listed as a must-test item in the monitoring of food pollutants in the global environmental monitoring plan. my country is a large agricultural country, and rice is one of the staple foods of our people, and the population who takes rice as a staple food accounts for more than 60%. Due to the rapid development of small and medium-sized enterprises, the discharge ...
Claims
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Application Information
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