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Process for preparing polypeptide surfactant by near-critical hydrolysis of feather keratin

A technology for surfactant and feather keratin, which is applied in the field of biomass processing and treatment, can solve the problems of long time consumption, easy inactivation, low yield and the like of industrial wastewater

Inactive Publication Date: 2014-07-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are mainly acid hydrolysis and enzymatic hydrolysis for feather protein hydrolysis. There are disadvantages in acid-base hydrolysis, such as easy-to-corrosion equipment, low yield, large amount of industrial waste water and long time consumption.
Enzymatic hydrolysis is very slow, and the enzyme is expensive and easy to lose activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The feather keratin solid is dried in an oven at 65°C, and crushed to 20-40 meshes. Weigh 1.0 g of dry keratin and 15 g of deionized water and put them into a 20 mL hydrothermal autoclave for reaction. The reaction temperature is 160° C., the reaction time is 60 minutes, and the maximum pressure during the reaction is 1.6 MPa. After the reaction, when the temperature of the reaction kettle dropped to room temperature, the hydrolyzate was suction filtered. The hydrolysis rate of keratin obtained from the amount of solid residue was 81.44%. The polypeptide filtrate obtained by suction filtration was tested for surface tension, and the measured surface tension was 44 mN / m. The foaming force measurement method is: make the hydrolyzed solution into a solution with a concentration of 1%, take 20mL into a 100mL stoppered measuring cylinder, shake it up and down for 20 times, let it stand for 30 seconds, record the foam volume V, foaming power = foam volume V / Test solution v...

Embodiment 2

[0014] The feather keratin solid is dried in an oven at 65°C, and crushed to 20-40 meshes. Weigh 1.5g of dry keratin and 15g of deionized water and put them into a 20mL hydrothermal autoclave for reaction. The reaction temperature is 200°C, the reaction time is 60 minutes, and the maximum pressure during the reaction is 3.9MPa. After the reaction, when the temperature of the reaction kettle dropped to room temperature, the hydrolyzate was suction filtered. The hydrolysis rate of keratin obtained from the amount of solid residue was 96.42%. The polypeptide filtrate obtained by suction filtration is tested for surface tension, and the surface tension is 37 mN / m, and the foaming force measurement method is: the hydrolyzate is made into a solution with a concentration of 1%, and 20mL is put in a 100mL stoppered measuring cylinder. Shake up and down 20 times, stand still for 30 seconds, record the foam volume V, foaming power = foam volume V / test solution volume, and the foaming p...

Embodiment 3

[0016] The feather keratin solid is dried in an oven at 65° C., and crushed to 20-40 meshes. Weigh 1.0 g of dry keratin and 15 g of deionized water and put them into a 20 mL high-temperature and high-pressure reactor for reaction. The reaction temperature is 180° C., the reaction time is 90 minutes, and the maximum pressure during the reaction is 2.6 MPa. After the reaction, when the temperature of the reaction kettle dropped to room temperature, the hydrolyzate was suction filtered. The hydrolysis rate of keratin obtained from the amount of solid residue was 95.21%. The polypeptide filtrate obtained by suction filtration is tested for surface tension, and the surface tension is 41 mN / m, and the foaming force measurement method is: the hydrolyzate is made into a solution with a concentration of 1%, and 20mL is put in a 100mL stoppered measuring cylinder. Shake up and down 20 times, stand still for 30 seconds, record the foam volume V, foaming power = foam volume V / test soluti...

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Abstract

The invention relates to a process for preparing a polypeptide surfactant by near-critical hydrolysis of feather keratin, and belongs to the technical field of biomass processing treatment. Polypeptide is a green surfactant with excellent properties such as nontoxicity, no irritation, environment friendliness, degradability, good biocompatibility, and the like, and has important applications in fields of bioengineering, medicine, food, cosmetics, environmental engineering, and the like. The polypeptide surfactant is prepared by hydrolyzing feather keratin in near-critical water without addition of acid or base catalysts, and keratin can be hydrolyzed into micromolecular polypeptide rapidly. The process is simple, causes no environmental pollution, and is an environment-friendly green process. When the mass ratio of feather keratin to water is (0.5-2):15, the temperature is 160 DEG C-200 DEG C, and the time is 30-90 min, the hydrolysis rate of feather keratin is up to 97%, and the surface tension of the prepared polypeptide surfactant aqueous solution is 37 mN / m.

Description

technical field [0001] The invention relates to a process method for preparing polypeptide surfactant by near-critical hydrolysis, that is, high-temperature and high-pressure hydrolysis of feather keratin, and belongs to the technical field of biomass processing. Background technique [0002] Feather is a derivative of keratinized poultry epidermal cells, and its protein content is 80%-90%, which has a high recycling value. Every year, millions of tons of feathers are produced in my country's poultry slaughterhouses, some of which are used as fillers, decorations, feed, etc., and most of them are discarded and landfilled, causing economic losses and environmental damage. Therefore, it is of great significance to process feathers, extract keratin and further process keratin to obtain products with high added value. [0003] Due to the advantages of non-toxic, non-irritating, good biocompatibility and good environmental compatibility, biosurfactants have attracted the attenti...

Claims

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Application Information

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IPC IPC(8): C07K1/12B01F17/30C09K23/30
Inventor 陈晋阳季益梅吕婧潇杨玄宇邢璐瑶丁巳芫李智炼
Owner SHANGHAI UNIV
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