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Method for detecting protein content in regenerated protein fiber

A technology for regenerating protein and protein content, applied in the preparation of test samples, chemical analysis by titration, etc., can solve the problems of 4h or even longer time, long test period, small scope of application, etc., and achieve short test period. , Easy to operate, wide range of effects

Inactive Publication Date: 2018-06-26
广东省江门市质量计量监督检测所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent also mentions the Kjeldahl method using a nitrogen distillation device. The test period of this method is longer. In addition to drying the fiber, it also needs to be digested. Due to the problem of the device, it takes 3~4h or even 3 hours to digest a sample. Longer time, and a set of devices can only digest one sample at a time, the efficiency is very low
And these two methods are only used for protein viscose fiber, the scope of application is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put a sufficient amount of soybean protein composite short fiber into a weighing bottle, dry it in a drying oven at (105±3)°C until it reaches a constant weight, cover the bottle cap, and move the weighing bottle into a desiccator equipped with color-changing silica gel. cool down.

[0020] Quickly weigh 0.2g of the cooled fiber, put it into the digestion tube, then add 0.4g of copper sulfate, 10g of potassium sulfate and 12mL of concentrated sulfuric acid into the digestion tube, place the digestion tube in a porous digestion furnace at 420°C, and digest for 45min , take it out and cool it down at room temperature.

[0021] Set the parameter conditions of the automatic Kjeldahl nitrogen analyzer: the amount of diluent (deionized water) added is 50mL, the amount of receiving solution (containing boric acid solution with a mass fraction of 4% mixed indicator) is added 50mL, and the concentration is 400g / L of sodium hydroxide The amount of solution added was 50mL, the di...

Embodiment 2

[0026] Put a sufficient amount of silkworm chrysalis protein viscose short fibers into a weighing bottle, dry in a drying oven at (105±3)°C until constant weight, cover the bottle cap, and move the weighing bottle into a desiccator filled with color-changing silica gel ,cool down.

[0027] Quickly weigh 0.2g of the cooled fiber, put it into the digestion tube, then add 0.4g of copper sulfate, 10g of potassium sulfate and 12mL of concentrated sulfuric acid into the digestion tube, place the digestion tube in a porous digestion furnace at 420°C, and digest for 45min , take it out and cool it down at room temperature.

[0028] Set the parameter conditions of the automatic Kjeldahl nitrogen analyzer: the amount of diluent (deionized water) added is 50mL, the amount of receiving solution (containing boric acid solution with a mass fraction of 4% mixed indicator) is added 50mL, and the concentration is 400g / L of sodium hydroxide The amount of solution added was 50mL, the distillati...

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PUM

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Abstract

The invention discloses a method for detecting protein content in regenerated protein fiber. The method includes weighing a certain amount of regenerated protein fiber baked to constant weight, into adigestive tube, adding a certain amount of copper sulfate, potassium sulfate and concentrated sulfuric acid, then digesting the mixture in a constant temperature digestion furnace for a period, and then performing test on a Kjeldahl analyzer after cooling. The protein content can be obtained by performing converting according to the set protein conversion coefficient. The method overcomes the shortcomings of complicated operation and long test period of the existing Kjeldahl method and the sodium hypochlorite method, and has the advantages of short test period, wide application range, high efficiency, simple operation and good repeatability.

Description

technical field [0001] The invention relates to a method for detecting textile components, in particular to a method for detecting protein content in regenerated protein fibers. Background technique [0002] Regenerated protein fiber is a new type of regenerated fiber obtained by extracting protein solution from animals or plants, physical blending or chemical copolymerization with other polymers, and wet spinning. At present, soybean protein composite fiber is more maturely used. , protein viscose fiber and milk protein fiber. Since the regenerated protein fiber contains protein components, it has good skin-friendly and comfortable properties. [0003] The protein content has an influence on the performance of the regenerated protein fiber, and is an important index to evaluate the performance of the regenerated protein fiber. Chinese patent CN104020075A discloses a method for quantitatively detecting the protein content in protein viscose fibers. It bakes protein viscose...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N1/44
CPCG01N1/44G01N31/16
Inventor 徐杰陈颂伟李伟坤李振球丁敏余晓筠
Owner 广东省江门市质量计量监督检测所
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