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Detection method for non-protein nitrogen-containing compound in feed protein raw material

A non-protein and nitrogen compound technology, which is applied in the direction of analyzing materials through chemical reactions and material analysis through observing the impact on chemical indicators, etc. It can solve the problems affecting the quality of livestock products, food safety risks, and endangering animal growth, etc. question

Inactive Publication Date: 2009-06-24
SHANDONG NEW HOPE LIUHE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This has left a technical loophole for unscrupulous businessmen, who often add some cheap nitrogen-containing compounds (such as urea, urea-formaldehyde polymers, melamine, etc.) to protein raw materials to make huge profits and harm animals. growth, affect the quality of livestock products, and pose a food safety risk

Method used

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Examples

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Effect test

Embodiment Construction

[0011] The crude protein content of a certain animal protein raw material fishmeal measured by the Kjeldahl method is 61%, which meets the contract requirements; however, according to the present invention, the sample containing urea-formaldehyde polymer can actually be judged to be an adulterated raw material.

[0012] The crude protein content of soybean meal of a plant protein raw material measured by the Kjeldahl method is 43.4%, which meets the contract requirements; however, according to the present invention, the sample containing urea-formaldehyde polymer can actually be judged to be an adulterated raw material.

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Abstract

The invention provides a method for detecting non-protein nitrogen-containing compounds in a feed protein raw material. Compared with other aldehyde, ketone and carbohydrate, formaldehyde produced in the decomposition of an ureaformaldehyde polymer, which is one of the non-protein nitrogen-containing compounds (NPN), under the action of hot sulfuric acid, has the characteristic that formaldehyde can form a purplish red substance with chromotropic acid, and the characteristic can be utilized for verifying whether the raw material is adulterated. The method comprises the following steps: after degreasing and drying the protein raw material with petroleum ether, placing the sample under a stereo microscope; picking out and placing suspicious materials into a 50ml beaker with a pair of tweezers; adding 1ml of chromotropic acid into the beaker; heating the beaker with an electric stove until fume starts rising; and taking the beaker off from the electric stove, and adding 50ml of water into the beaker instantly. The fact that the liquid turns purplish red shows that a non-protein nitrogen (NPN)-containing compound, called unreaformaldehyde polymer, is present in the sample, so that whether the sample is adulterated can be verified accurately.

Description

Technical field: [0001] The invention relates to the field of detection of feed raw materials, in particular to a detection method capable of detecting the adulteration phenomenon of urea-formaldehyde polymer, one of non-protein nitrogenous compounds (NPN), in feed protein raw materials. Background technique: [0002] The detection method of protein content in feed GB6432-1994 is obtained by multiplying the content of nitrogen element by Kjeldahl method and multiplying it by a coefficient (6.25). There is a big defect in this sample detection method, that is, all nitrogen-containing compounds in the sample are identified as proteins. This has left a technical loophole for unscrupulous businessmen, who often add some cheap nitrogen-containing compounds (such as urea, urea-formaldehyde polymers, melamine, etc.) to protein raw materials to make huge profits and harm animals. growth, affect the quality of livestock products, and cause food safety risks. [0003] Advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 郭吉原荣佳隋莉孔凡科王永强张蕾朱素丽吕明斌黄河李鑫崔芹
Owner SHANDONG NEW HOPE LIUHE GROUP
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