Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for analyzing protein adulteration in dairy products

An analysis method and technology of dairy products, which is applied in the field of analysis of protein adulteration in dairy products, can solve the problems that grass-roots inspection departments have difficulty in having inspection resources, high inspection costs, and troublesome operations, and achieve broad market application prospects and meet safety requirements. The effect of control needs and simple operation

Active Publication Date: 2014-09-24
SOUTH CHINA AGRI UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Monitoring is an important management measure to ensure food safety in the market, and it is also a routine work of the Chinese government management department. However, there are currently the following problems in the monitoring of milk protein adulteration: 1. There are loopholes in the detection method: the protein content determination method in milk / milk powder is Kjeldahl method, this method converts nitrogen content into protein for quantification, as long as various compounds with high nitrogen content are added, similar adulteration effects can be produced, so it is necessary to fundamentally solve the adulteration of milk / milk powder The problem needs to be solved from the means of protein determination; 2. Protein is composed of amino acids. In theory, detecting the content and ratio of all essential amino acids can achieve the control of protein adulteration. At present, the simultaneous detection of all essential amino acids is generally used. Amino acid analyzers, the detection cost is quite high, it is difficult for grassroots detection departments to have such detection resources
[0004] The existing detection of protein adulteration in dairy products, one is the detection of adulteration of non-protein nitrogenous substances. At present, the research on this is relatively mature at home and abroad, and there are existing international standards to strictly monitor it; the other is The detection of non-dairy protein adulteration is currently mainly based on the differences in protein amino acid composition, solubility, antigen specificity, molecular weight, and charge, but most of the operations are cumbersome and time-consuming. There is no report on the identification of milk protein adulteration by amino acid pattern

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for analyzing protein adulteration in dairy products
  • Method for analyzing protein adulteration in dairy products
  • Method for analyzing protein adulteration in dairy products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Milk sample protein simulation adulteration discrimination

[0042] (1) Accurately weigh 0.010g each of tryptophan, threonine, valine, and lysine standard substances, dissolve them in 0.01mol / L HCl solution and dilute to 10mL, and prepare a standard stock of 1000μg / mL liquid in a volumetric flask. Prepare standard solutions with tryptophan concentrations of 1, 5, 10, 25, and 50 μg / mL with tryptophan standard stock solutions; prepare threonine, valine, and lysine standard stock solutions to prepare threonine, Valine, lysine mixed standard solution, so that the concentrations of threonine were 2, 10, 20, 50, 100 μg / mL; mL; derivatize the mixed standard solution of threonine, valine, and lysine; draw 10 μL of the derivative solution of tryptophan standard solution and the mixed standard solution of threonine, valine, and lysine, respectively, and inject High-performance liquid chromatography is analyzed, obtains the peak area of ​​high-performance liquid chro...

Embodiment 2

[0062] Example 2 Milk powder sample protein simulation adulteration discrimination

[0063] (1) Accurately weigh 0.010g each of tryptophan, threonine, valine, and lysine standard substances, dissolve them in 0.01mol / L HCl solution and dilute to 10mL, and prepare a standard stock of 1000μg / mL liquid in a volumetric flask. Prepare standard solutions with tryptophan concentrations of 1, 5, 10, 25, and 50 μg / mL with tryptophan standard stock solutions; prepare threonine, valine, and lysine standard stock solutions to prepare threonine, Valine, lysine mixed standard solution, so that the concentrations of threonine were 2, 10, 20, 50, 100 μg / mL; mL; derivatize the mixed standard solution of threonine, valine, and lysine; draw 10 μL of the derivative solution of tryptophan standard solution and the mixed standard solution of threonine, valine, and lysine, respectively, and inject High-performance liquid chromatography is analyzed, obtains the peak area of ​​high-performance liqu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
wavelengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an analysis method for protein adulteration in dairy products. The method is as follows: firstly divide the sample into two parts, one for alkali hydrolysis and one for acid hydrolysis; after alkali hydrolysis, acid is used for neutralization; Evaporate to dryness and redissolve with dilute acid, derivatize the reconstituted solution with a derivatizing agent, and filter through an organic filter to obtain a sample solution; prepare a tryptophan standard solution and a mixed standard of threonine, valine and lysine respectively Then inject the standard solution and the sample solution into the high performance liquid chromatograph, then measure the peak area of ​​the standard solution and the sample solution, and calculate the content of tryptophan, threonine, valine and lysine in the sample solution . The method is simple to operate, can quickly obtain analysis results, has low analysis cost, and is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of liquid chromatography analysis, and in particular relates to an analysis method for protein adulteration in dairy products. Background technique [0002] With the improvement of living standards, people's demand for milk and dairy products shows a continuous upward trend. Driven by huge market interests, many dairy production companies or individuals adulterate dairy products in order to make huge profits. Milk is rich in protein, fat, and carbohydrates. According to the nutrition required by human beings, protein is the ingredient with the highest nutritional value in milk. Therefore, one of the main indicators for the detection of milk and dairy products is protein; correspondingly, milk The adulteration of products is mainly aimed at the adulteration of milk protein. For example, in Shandong in 2005, it was found that milk had been added with leather hydrolyzed protein; in 2008, Shijiazhuang Sanlu G...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/88
Inventor 柳春红赖玉婷董芷呈陈挺强王培坚李明芬
Owner SOUTH CHINA AGRI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products