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Novel hair hydrolyzing technique

A new process, hair technology, applied in the preparation of hydrogenated polysulfides/polysulfides, organic chemistry, etc., can solve the problems affecting the separation and purification of amino acids, side reactions, increase production energy consumption, etc. The effect of low hydrolysis temperature and energy saving in production

Inactive Publication Date: 2009-08-12
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defects of this process mainly include the following points: 1. It is necessary to use high-concentration inorganic strong acid for hydrolysis, and high-concentration inorganic strong acid has strong oxidizing property, so that the hydrolyzate appears black, which affects various amino acids after hydrolysis The accurate regulation of the isoelectric point of the amino acid will either reduce the yield of amino acid, or affect the separation and purification of amino acid; and the high concentration of inorganic strong acid will easily cause some side reactions during hydrolysis, which will also affect the hydrolysis yield and the hydrolysis obtained. The separation and purification of amino acids has a great impact
2. It needs to be hydrolyzed at a high temperature above 100°C, which not only increases the production energy consumption, but also easily leads to side reactions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Step A, pretreatment of hair hydrolysis

[0012] First wash the hair with clean water, then clean it with decontamination powder to remove dirt, grease, etc., and finally wash it with clean water, dry it at 40°C and cut it into short hair for later use.

[0013] Step B, acid hydrolysis

[0014] Firstly, 300 ml of trichloroacetic acid aqueous solution with a concentration of 5 mol / L is added to 200 g of treated dry hair, and then the closed constant temperature hydrolysis reaction is carried out in a 60-80° C. water bath for 7-9 hours.

[0015] Step C, use alkali to neutralize and adjust the isoelectric point to precipitate the corresponding amino acid

[0016] Adjust the pH value to 5.0 with 6 mol / L ammonia water, stand to crystallize, and filter and dry to obtain 11.4 g of L-cystine powder with a yield of 5.7% and a purity of 99%.

Embodiment 2

[0018] Step A, pretreatment of hair hydrolysis

[0019] First wash the hair with clean water, then clean it with decontamination powder to remove dirt, grease, etc., and finally wash it with clean water, dry it at 40°C and cut it into short hair for later use.

[0020] Step B, acid hydrolysis

[0021] First, 500 ml of trichloroacetic acid aqueous solution with a concentration of 3 mol / L is added to 200 g of the treated dry hair, and then the closed constant temperature hydrolysis reaction is carried out in a 60-80° C. water bath for 7-9 hours.

[0022] Step C, use alkali to neutralize and adjust the isoelectric point to precipitate the corresponding amino acid

[0023] Adjust the pH value to 5.0 with 6 mol / L ammonia water, stand to crystallize, and filter and dry to obtain 10.6 g of L-cystine powder with a yield of 5.3% and a purity of 99%.

Embodiment 3

[0025] Step A, pretreatment of hair hydrolysis

[0026] First wash the hair with clean water, then clean it with decontamination powder to remove dirt, grease, etc., and finally wash it with clean water, dry it at 40°C and cut it into short hair for later use.

[0027] Step B, acid hydrolysis

[0028] First, 200 ml of trichloroacetic acid aqueous solution with a concentration of 8 mol / L is added to 200 g of the treated dry hair, and then the closed constant temperature hydrolysis reaction is carried out in a 60-80 DEG C water bath for 7-9 hours.

[0029] Step C, use alkali to neutralize and adjust the isoelectric point to precipitate the corresponding amino acid

[0030] Adjust the pH value to 5.0 with 6 mol / L ammonia water, stand for crystallization, and filter and dry to obtain 11.0 g of L-cystine powder with a yield of 5.5% and a purity of 99%.

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Abstract

The invention discloses a new hair hydrolyzing process comprising three steps, i.e. hair treatment before hydrolysis, acid hydrolysis and alkali neutralization for adjusting isoelectric point so as to precipitate corresponding amino acid. The method is characterized in that the conditions for the acid hydrolysis are as follows: acid solution is trichloroacetic acid aqueous solution, acid concentration is 3-8 mol / L, the temperature of the acid hydrolysis is 60-80 DEG C, the time of the acid hydrolysis is 7-9 h, and the mass ratio of the hair and the trichloroacetic acid is 0.1-3. The conditions for the acid hydrolysis not only realizes the aim of obtaining the amino acid during hair hydrolysis, but also can obtain clear and transparent hair hydrolysa, thereby solving the problem that black hydrolysa in the prior art affects the accurate control and adjustment of the isoelectric point of various amino acids after hydrolysis. In addition, the temperature of the acid hydrolysis is low, thereby not only saving energy during production but also avoiding the generation of a few secondary reactions, and not only improving the yield rate but also being favorable for the separation and purification of the amino acid.

Description

technical field [0001] The invention relates to a hair hydrolysis process and belongs to the technical field of fine chemical treatment. Background technique [0002] Animal feathers, human hair and nails are composed of a protein called keratin, which is a natural protein source containing a variety of amino acids and can be widely used in food, feed additives, medicine, cosmetics, pesticides, synthetic raw materials and industrial aspect. At present, most of the natural proteins such as hair are hydrolyzed by inorganic strong acids such as sulfuric acid and hydrochloric acid to prepare various amino acids. The defects of this process mainly include the following points: 1. It is necessary to use high-concentration inorganic strong acid for hydrolysis, and high-concentration inorganic strong acid has strong oxidizing property, so that the hydrolyzate appears black, which affects various amino acids after hydrolysis The accurate control of the isoelectric point of the amin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/58C07C319/22
Inventor 刘继华钱士强
Owner SHANGHAI UNIV OF ENG SCI
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