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Fermentation method capable of reducing content of heavy metal cadmium in rice

A fermentation method and technology for heavy metals, applied in the fields of bacteria, food science, and applications used in food preparation, can solve the problems of large fluctuations in the efficiency of heavy metal cadmium, reduce the risk of unstable work, improve efficiency, and stabilize fermentation. The effect of cadmium efficiency

Active Publication Date: 2016-02-24
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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  • Fermentation method capable of reducing content of heavy metal cadmium 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 After 16-28 hours. 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 1000g of a rice sample with a cadmium content of 0.40mg / kg, add 0.5g of dextrin and 9.5g of sugar (the total amount of dextrin and sugar accounts for 1.0% of the mass of rice), add 1200g of water and mix well, and then add 35g of stable fermentation broth (accounting for 3.5% of rice) were inoculated into the soaking solution and incubated at 32°C for 24h. 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. Detected 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 embodiment 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 only the fermen...

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 24h. 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. Detected by flame atomic absorption method, wherein the residual amount of cadmium is 0.1585mg / kg, which is lower than the national standard of 0.2mg / kg, indicating that this embodiment 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 liquid...

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Abstract

The invention discloses a fermentation method capable of reducing the content of heavy metal cadmium in rice. According to the invention, stable fermentation broth is prepared through necessary soaking or fermentation procedure of deep processing of milled early long-grain non-glutinous rice, and the simple and low-cost method using the stable fermentation broth for reducing the content of heavy metal cadmium in rice is provided. A bacterial strain in traditional fermentation broth, e.g., lactobacillus plantarum, lactobacillus fermenti, lactobacillus salivarius and yeast, is employed to improve the nutrient structure in an impregnation solution used in the process of fermentation, so nutrient supply in the process of microbial fermentation can be increased, the growth rate of microbes is promoted, and the number of live bacteria of the microbes in the impregnation solution is increased in a certain period of time. Through improvement of the vitality of lactic acid bacteria, increase of the acidity of the impregnation solution can be accelerated, and impregnation of the acid solution is capable of reducing the content of heavy metal cadmium in rice. In virtue of acid production of the lactic acid bacteria, a complexing bond between the heavy metal cadmium and protein is broken, so cadmium is dissociated; a part of cadmium is adsorbed in virtue of membrane absorption of the microbes at the same time; thus, the content of heavy metal cadmium in rice is substantially reduced 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 (0.2mg / 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 Applications(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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