A method of reducing heavy metals in rice products by complex method

A heavy metal and complex technology, applied in the field of grain deep processing, can solve the problems of complex process, high preparation difficulty and high cost, and achieve the effects of saving energy and cost, easy separation and good quality.

Active Publication Date: 2020-06-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for reducing heavy metals are complicated in process, difficult in preparation, and high in cost, which makes many manufacturers unwilling to completely reduce heavy metals, and makes people eat rice products with great risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for reducing heavy metals in rice by complexation, comprising the steps of:

[0028] (1) pulping: paddy (lead content is 0.2ppm, mercury content is 0.02ppm, cadmium content is 0.2ppm) water pulping, wherein the ratio of material to liquid is 1:1, with sodium hydroxide (the concentration of sodium hydroxide is 1%) adjust slurry pH to be 6.5;

[0029] (2) Complexation: Add chitosan and phytic acid (mass ratio 1:1) to the feed liquid prepared in step (1), and the addition amount is 0.05% (according to the mass of the feed liquid after dispersion meter), soaked in a water bath at 30°C for 1 hour, stirred at normal pressure for 0.5 hours after soaking, and stirred at a speed of 100 r / min, then vacuumed for 0.5 hours, and maintained a vacuum of 0.06 MPa; followed by pressurized reaction for 0.5 hours, maintained at a pressure of 0.2 MPa ; Wherein the pH of the complexation reaction process is maintained between 6.5.

[0030] (3) Washing and separation: the reaction...

Embodiment 2

[0033] A method for reducing heavy metals in brown rice by complexation, comprising the steps of:

[0034] (1) pulping: brown rice (lead content is 0.3ppm, mercury content is 0.03ppm, cadmium content is 1.0ppm) water pulping, solid-liquid ratio 1:1.5, with sodium hydroxide (the concentration of sodium hydroxide is 2 %) Regulating slurry pH is 6.7;

[0035] (2) Complexation: Add the prepared chitosan and phytic acid (mass ratio 1:1.5) solution to the feed liquid prepared in step (1), and the addition amount is 0.15% (according to the feed liquid after dispersion (mass meter) reaction, soaked in a water bath at 40°C for 1.5h, stirred at normal pressure for 0.75h after soaking, and the stirring speed was 150r / min, and then reacted with vacuum for 0.75h, maintaining a vacuum of 0.07MPa; followed by pressurized reaction for 0.75h, The pressure is maintained at 0.4MPa; the pH of the complexation reaction process is maintained at 6.7.

[0036] (3) Washing and separation: the reacti...

Embodiment 3

[0039] A method for reducing heavy metals in whole rice by complexation, comprising the steps of:

[0040] (1) pulping: the whole rice (lead content is 0.3ppm, mercury content is 0.03ppm, cadmium content is 0.8ppm) water pulping, solid-liquid ratio 1:1.5, with sodium hydroxide (the concentration of sodium hydroxide is 3%) adjust slurry pH to be 6.8;

[0041] (2) Complexation: add the prepared chitosan and phytic acid (mass ratio 1:2) solution, the addition amount is 0.18% (according to the mass of the feed liquid after dispersion) to the prepared slurry according to step (1). In the feed solution, soak for 2 hours in a water bath at 45°C, stir at normal pressure for 1 hour after soaking, and stir at a speed of 180 r / min, then use vacuum for 1 hour to maintain a vacuum of 0.08 MPa; then pressurize for 1 hour to maintain a pressure of 0.6 MPa; Wherein the complexation reaction process pH is maintained between 6.8.

[0042] (3) Washing and separation: the reaction solution obta...

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Abstract

The invention discloses a method for reducing heavy metal in rice products by utilizing a complexation method. The method comprises the following steps: carrying out pulp conditioning on the rice products (rice, unpolished rice, whole rice, broken rice, rice flour, rice bran, rice protein and the like), carrying out vacuum pressure immersion, complexing, washing and separating and drying to finally prepare corresponding rice products with low content of the heavy metal. According to the method disclosed by the invention, the heavy metal in the rice products is complexed by utilizing a chitosan and phytic acid compound complexing agent; chitosan and phytic acid, which are separated from the heavy metal of the rice products, are combined and then are washed and separated, so that the content of the heavy metal in the rice products is reduced and rice deep processing products with high quality and low content of the heavy metal are prepared. The rice products prepared by the method is relatively low in protein loss degree; the taste change is small; meanwhile, the method is simple to operate, low in cost and suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of grain deep processing, in particular to a treatment method for reducing heavy metal content in rice, brown rice, whole rice, broken rice, rice flour, rice bran, rice protein and the like. Background technique [0002] China is the world's largest rice producer. In 2008, the rice output was 189 million tons. Rice is my country's largest food crop. However, the quality of the soil in various places is directly related to the quality of edible rice. However, the adsorption of heavy metal pollution by rice It is obviously stronger than other crop varieties such as corn and soybean. Therefore, the rice is treated by means of deep processing to obtain high-quality products while removing heavy metals, which also increases the added value of rice utilization. [0003] Heavy metals in rice are mainly combined with amino acids in a chelated state. It is reported that heavy metals in plants are mainly combined with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L5/20
Inventor 于秋生冯伟平向莉李珍妮徐晖於慧利张芬芬
Owner JIANGNAN UNIV
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