Preparation method of special half-dried flour for physalis alkekengi rice noodles

A technology of physalis rice noodle and semi-dry powder, which is applied in the field of grain deep processing, can solve the problems of material loss, low removal rate of lead and mercury, and no method for removing cadmium, etc., and achieve high quality, low cost and wide range of heavy metal reduction Effect

Active Publication Date: 2017-05-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although most of the arsenic and cadmium are removed in the application of the above patents, there are the following disadvantages: (1) the removal rate of lead and mercury is not high; (2) t

Method used

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  • Preparation method of special half-dried flour for physalis alkekengi rice noodles

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Experimental program
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Effect test

Embodiment 1

[0031] Get the rice (lead content is 0.2ppm, mercury content is 0.02ppm, cadmium content is 0.2ppm, arsenic content is 0.2ppm) that heavy metal exceeds the standard and carry out the following steps:

[0032] (1) soak rice for acid adjustment: soak the rice in water, the ratio of solid to liquid is 1:1, adjust the pH to 4.0 with the acid adjustment solution, and the acid adjustment solution is; the mixture of lactic acid and glacial acetic acid (the mol ratio of lactic acid and glacial acetic acid is 2 : 1) compound acid formed with hydrochloric acid, wherein the mol ratio of mixture and hydrochloric acid is 3:1;

[0033] (2) Add lactic acid bacteria: add lactic acid bacteria in the feed liquid of step (1), the addition amount is 5×10 6 cfu / g (according to rice mass);

[0034] (3) Dynamic countercurrent fermentation: Add the feed liquid containing the bacteria in step (2) to the countercurrent device that has sterilized the bacteria, set the fermentation temperature to 45°C, ...

Embodiment 2

[0041]Get the rice (lead content is 0.3ppm, mercury content is 0.03ppm, cadmium content is 0.8ppm, arsenic content is 0.4ppm) that heavy metal exceeds the standard and carry out the following steps:

[0042] (1) soaking rice for acid adjustment: soak the rice in water, the ratio of solid to liquid is 1:1.1, adjust the pH to 4.5 with the acid adjustment solution, and the acid adjustment solution is a mixture of three acids: citric acid, malic acid and fumaric acid ( Citric acid, malic acid, fumaric acid molar ratio is 1:2:1) and the composite acid of hydrochloric acid, wherein the molar ratio of mixture and hydrochloric acid is 4:1;

[0043] (2) Adding lactic acid bacteria: adding lactic acid bacteria to the feed liquid in step (1), the addition amount is 6×10 6 cfu / g (according to rice mass);

[0044] (3) Dynamic countercurrent fermentation: Add the feed liquid containing the bacteria in step (2) into the countercurrent device that has sterilized the bacteria, set the ferment...

Embodiment 3

[0051] Get the rice (lead content is 0.4ppm, mercury content is 0.04ppm, cadmium content is 2ppm, arsenic content is 0.6ppm) that heavy metal exceeds the standard and carry out the following steps:

[0052] (1) Sour rice acid adjustment: rice is soaked in water, the ratio of material to liquid is 1:1.2, and the pH is adjusted to 5.0 with the acid adjustment solution, and the acid adjustment solution is; a mixture of tartaric acid, metatartaric acid, citric acid (tartaric acid, metatartaric acid, The compound acid that citric acid mol ratio is 3:2:1) and hydrochloric acid forms, and wherein the mol ratio of mixture and hydrochloric acid is 5:1;

[0053] (2) Add lactic acid bacteria: add lactic acid bacteria to the feed liquid in step (1), the addition amount is 7×10 6 cfu / g (according to rice mass);

[0054] (3) Dynamic countercurrent fermentation: Add the feed liquid containing the bacteria in step (2) to the countercurrent device that has sterilized the bacteria, set the fer...

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Abstract

The invention discloses a preparation method of special half-dried flour for physalis alkekengi rice noodles. According to the method, rice is used as a raw material. The method comprises the following steps of soaking the rice, performing whole-rice fermentation, performing washing and separation, performing draining, performing crushing, and finally performing solid state fermentation treatment so as to obtain the half-dried rice flour with low content of heavy metals. According to the method disclosed by the invention, the heavy metals in the rice are dissociated out by a fermentation method, the fermentation reaction efficiency is improved through a dynamic reverse-flow device, after water is thoroughly drained, the whole rice is crushed, rhizopus oryzae and ester-production fragrance-production yeast are added for performing solid state fermentation on the half-dried rice flour, and finally re-crushing is performed so that the half-dried rice flour is obtained for standby application. The rice flour prepared by the method has special fragrance and is low in the content of the heavy metals, wherein the content of cadmium is lower than 0.2mg/kg, the content of total mercury is lower than 0.02mg/kg, the content of lead is lower than 0.2mg/kg, the content of inorganic arsenic is lower than 0.2mg/kg, and the removing rate for the heavy metal cadmium can reach 95% or above; and besides, the method is simple to operate, low in cost and convenient to use, and can be used for production of the physalis alkekengi rice noodles.

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 by fermentation. 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 processed through 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 ligands formed by metallothionein, and some of them are combined with li...

Claims

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Application Information

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IPC IPC(8): A23L7/104A23L5/20
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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