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A kind of fermentation method for reducing heavy metal cadmium content in rice

A fermentation method and heavy metal technology, applied to bacteria, lactobacillus, food science and other directions used in food preparation, can solve the problems of large fluctuation range of heavy metal cadmium efficiency, reduce the risk of unstable work, and have obvious cadmium removal effect. The effect of increasing the number

Active Publication Date: 2020-02-04
GAEA GEM RICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fermentation liquid contains Lactobacillus plantarum, Lactobacillus salivarius, yeast and other microorganisms. This method is greatly affected by the ambient temperature and the activity of the fermentation liquid, and the efficiency of reducing heavy metal cadmium also fluctuates widely.

Method used

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  • A kind of fermentation method for reducing heavy metal cadmium content in rice

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 1000g of rice samples with a cadmium content of 0.08mg / kg, add 3g of dextrin and 3g of sugar (the total amount of dextrin and sugar accounts for 0.6% of the mass of rice), add 4000g of water and mix well, add 80g of stable fermentation broth and incubate at 32°C 16-28 hours later. The measured pH value of the fermentation broth was stable at about 3.58, and the total number of lactic acid bacteria was 5.0×10 9 About cfu / mL, the highest value during the fermentation process.

[0043] Control 1: The rice (cadmium content: 0.08 mg / kg) was soaked in the original fermentation broth, but no nutrients were added, and it was fermented for 16-28 hours under the same conditions. The pH value of the fermented liquid was measured to be about 3.70, and it was unstable, and the total number of lactic acid bacteria was 4.9×10 8 About cfu / mL is the highest value during the fermentation process.

Embodiment 2

[0045] Take 1000 g of rice samples with cadmium content of 0.40 mg / kg, add 0.5 g of dextrin and 9.5 g of sugar (the total amount of dextrin and sugar accounts for 1.0% of the mass of rice), add 1200 g of water and mix well, and then add 35 g of stable fermentation broth ( Accounting for 3.5% of rice) were inoculated into the soaking solution and incubated at 32 °C for 24 h. After the fermentation is completed, the fermented liquid is filtered out, the fermented rice is washed with clear water, and the heavy metal cadmium is removed after being filtered and dried. After testing by flame atomic absorption method, the residual amount of cadmium is 0.0940 mg / kg, which is much lower than the national standard of 0.2 mg / kg, indicating that this implementation can effectively remove heavy metal cadmium in rice.

[0046] Control 1: Stable fermented liquid was added to the rice soaking liquid, but no nutritional additives (such as dextrin, sugar, etc.) were added for fermentation, and ...

Embodiment 3

[0048] Take 1000g of rice sample with a cadmium content of 0.65mg / kg, add 2g of modified starch and 2g of sugar (modified starch and sugar account for 0.4% of the mass of rice), add 1200g of water and mix well, and then add 50g of stable fermentation broth (accounting for 5% of rice) ) were inoculated into the soaking solution and incubated at 32 °C for 24 h. After the fermentation is completed, the fermented liquid is filtered out, the fermented rice is washed with clear water, and the heavy metal cadmium is removed after being filtered and dried. After detection by flame atomic absorption method, the residual amount of cadmium is 0.1585 mg / kg, which is lower than the national standard of 0.2 mg / kg, indicating that this implementation can effectively remove heavy metal cadmium in rice.

[0049] Control 1: Stable fermented liquid was added to the rice soaking liquid, but no nutritional additives (such as dextrin, sugar, etc.) were added for fermentation, and only the fermented...

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Abstract

The invention discloses a fermentation method for reducing the content of heavy metal cadmium in rice. A stable fermented liquid is prepared by using the soaking or fermented processes required in the deep processing of early indica rice, and the stable fermented liquid is used to provide a method with simple process and low cost. Low method of reducing cadmium content in rice. The present invention utilizes the strains in the traditional fermentation liquid, such as Lactobacillus plantarum, Lactobacillus fermentum, Lactobacillus salivarius, yeast, etc., to improve the nutrient structure of the soaking solution in the fermentation process, increase the nutrient supply in the microbial fermentation process, and promote The growth rate of microorganisms increases the number of viable microorganisms in the soaking solution within a certain period of time. Improving the activity of lactic acid bacteria can accelerate the increase of the acidity in the soaking solution, and soaking in the acid solution can reduce the cadmium content in rice. Using lactic acid bacteria to produce acid breaks the bond between heavy metal cadmium and protein complexation, thereby freeing cadmium. At the same time, using the membrane adsorption of microorganisms to absorb part of cadmium, greatly reducing the content of cadmium in rice after washing.

Description

technical field [0001] The invention relates to the technical field of rice deep processing and the field of food fermentation, in particular to a method for reducing the content of heavy metal cadmium in rice or brown rice by using fermentation. Background technique [0002] Rice is the world's largest food crop and one of the most important staple foods. At present, the heavy metal pollution of rice in China is serious, especially the cadmium content of more than 70% of rice in the south exceeds the national food safety standard value (0.2 mg / kg), which greatly affects the safety of rice and its processed products. According to the National Soil Pollution Survey Bulletin released by the Ministry of Environmental Protection and the Ministry of Land and Resources in April 2014, nearly one-fifth of the country's cultivated land is polluted. As a pilot province for the restoration and treatment of heavy metal-contaminated cultivated land, Hunan mainly adopts "VIP technology",...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23L7/104A23L5/20
CPCA23V2400/143A23V2400/181A23V2400/169
Inventor 刘也嘉肖冬梅张珺段卓梅小弟林利忠
Owner GAEA GEM RICE
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