Method for removing nitrite from milk by utilizing membrane separation technology

A technology for nitrite and membrane separation, applied in applications, milk preparations, dairy products, etc., can solve the problem of inedible milk, and achieve the effect of reducing ash content and improving quality

Inactive Publication Date: 2011-02-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a method for removing nitrite in milk by using membrane separation technology, to solve the problem that milk with excessive nitrite content cannot be eaten, and to eliminate environmental pollution caused by waste milk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Firstly, the milk whose nitrite content exceeds the standard (1.0mg / kg) is subjected to ultrafiltration treatment. The molecular weight cut-off of the organic ultrafiltration membrane is 10,000MW, the pressure difference of each membrane module is 0.07MPa, the operating temperature is 10°C, and the diafiltration solvent is Purified water, continuously add water for diafiltration until the nitrite contained in the milk drops below 0.1mg / kg, and the volume of diafiltration water is 5 times the volume of the milk to be treated. Then the ultrafiltration permeate is subjected to nanofiltration treatment, the molecular weight cut-off of the organic nanofiltration membrane is 100-300MW, the pressure difference of each membrane module is 0.1MPa, and the operating temperature is 10°C. Finally, after mixing the qualified ultrafiltration retentate (nitrite content≤0.1mg / kg) with the nanofiltration retentate (nitrite content≤0.1mg / kg), homogenize and sterilize (treatment at 135°C) ...

Embodiment 2

[0024] Firstly, the milk whose nitrite content exceeds the standard (0.6mg / kg) is subjected to ultrafiltration treatment. The molecular weight cut-off of the organic ultrafiltration membrane is 10,000MW, the pressure difference of each membrane module is 0.1MPa, the operating temperature is 15°C, and the diafiltration solvent is Purified water, continuously add water for diafiltration until the nitrite contained in the milk drops below 0.1mg / kg, and the volume of diafiltration water is twice the volume of the milk to be treated. Then the ultrafiltration permeate is subjected to nanofiltration treatment, the molecular weight cut-off of the organic nanofiltration membrane is 100-300MW, the pressure difference of each membrane module is 0.15MPa, and the operating temperature is 20°C. Finally, after mixing the qualified ultrafiltration retentate (nitrite content≤0.1mg / kg) with the nanofiltration retentate (nitrite content≤0.1mg / kg), homogenize and sterilize (treatment at 135°C) 5s...

Embodiment 3

[0026] Firstly, the milk whose nitrite content exceeds the standard (0.4mg / kg) is subjected to ultrafiltration treatment, the inorganic ultrafiltration membrane has a molecular weight cut-off of 20,000MW, the pressure difference of each membrane module is 0.2MPa, the operating temperature is 20°C, and the diafiltration solvent is Purified water, continuously add water for diafiltration until the nitrite contained in the milk drops below 0.1mg / kg, and the volume of diafiltration water is 1 times the volume of the milk to be treated. Then the ultrafiltration permeate is subjected to nanofiltration treatment, the molecular weight cut-off of the organic nanofiltration membrane is 100-300MW, the pressure difference of each membrane module is 0.2MPa, and the operating temperature is 30°C. Finally, after mixing the qualified ultrafiltration retentate (nitrite content≤0.1mg / kg) with the nanofiltration retentate (nitrite content≤0.1mg / kg), homogenize and sterilize (treatment at 135°C) ...

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PUM

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Abstract

The invention relates to a method for removing nitrite from milk by utilizing a membrane separation technology, belonging to the field of the membrane separation technology of dairy foods. The method comprises the following steps of: (1) carrying out the ultrafiltration treatment of milk; (2) carrying out the nanofiltration treatment of ultrafiltration permeated liquid; and (3) mixing ultrafiltration trapped fluid and nanofiltration trapped fluid, homogenizing and sterilizing. The invention solves the problem of overstandard nitrite in milk by utilizing the membrane separation method. The product obtained by applying the method of the invention accords with the national standards, has unchanged nutritional value and flavor and decreased ash content and can be used as a food raw material.

Description

technical field [0001] The invention relates to a method for removing nitrite in milk by using membrane separation technology, and belongs to the technical field of membrane separation of dairy products. Background technique [0002] Nitrite exists widely in nature. Nitrite can oxidize ferrous iron in hemoglobin to trivalent iron to form methemoglobin, thus losing the ability to carry oxygen and causing tissue hypoxia. If the human body takes in too much nitrite at one time, methemoglobinemia will occur, that is, nitrite poisoning. Nitrite can also react with secondary amines, intermediate products of protein metabolism, to generate a carcinogen—nitrosamines. Milk is an important food in people's daily life. Based on the possible harm of nitrite to human health, in order to ensure the safety of dairy products, my country's national standard stipulates that the limit index of nitrite in milk is 0.2mg / kg. [0003] Under normal circumstances, because cow rumen microorganism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23C9/142
Inventor 窦建鹏张守勤张劲松孟庆伟李东升
Owner JILIN UNIV
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