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Analysis method of carbon chain composition of cocoyl amino acid surfactants

A technology of cocoyl amino acid and surfactant, applied in the field of chemical analysis, can solve the problems such as the ineffectiveness of long carbon chain component analysis, and achieve the effects of low cost, high sensitivity and simple operation

Active Publication Date: 2016-06-15
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not effective for the analysis of long carbon chain components

Method used

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  • Analysis method of carbon chain composition of cocoyl amino acid surfactants
  • Analysis method of carbon chain composition of cocoyl amino acid surfactants
  • Analysis method of carbon chain composition of cocoyl amino acid surfactants

Examples

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Embodiment 1

[0033] A kind of high-performance liquid chromatography analysis method that the carbon chain of sodium cocoyl alaninate of the present embodiment forms, comprises the steps:

[0034] (1) Disperse 1.0 g of sodium cocoyl alaninate (commercially available) in 50 mL of 6N hydrochloric acid, heat it to reflux for 4 hours, then cool the reaction solution to room temperature, and adjust the pH to 1.5-2.0 with 32% liquid caustic soda;

[0035] (2) First use n-hexane to extract the fatty acids in the system (extraction three times, each time 100mL n-hexane), then use about 10g of anhydrous sodium sulfate to dry the obtained extract, filter the desiccant and carry out rotary evaporation to obtain the fatty acid extract , dissolve it with 5mL DMF for use;

[0036] (3) Weigh 0.71g α-bromoacetophenone and 0.42gKF, disperse with 5mLDMF and stir for 1min, then add the DMF solution obtained in step (2) (the mol ratio of KF, α-bromoacetophenone and fatty acid is controlled In the range of 8-...

Embodiment 2

[0049] A kind of high-performance liquid chromatography analysis method that the carbon chain of sodium cocoyl glycinate of the present embodiment forms, comprises the steps:

[0050] (1) Disperse 1.0 g of sodium cocoyl glycinate (commercially available) in 50 mL of 6N hydrochloric acid, heat it to reflux for 4 hours, then cool the reaction solution to room temperature, and adjust the pH to 1.5-2.0 with 32% liquid alkali;

[0051] (2) First use n-hexane to extract the fatty acids in the system (extract three times, 100mL n-hexane each time), then dry the obtained extract with about 10g of anhydrous sodium sulfate, filter the desiccant and perform rotary evaporation to obtain an oily extract , dissolve it with 5mL DMF for use;

[0052](3) Take by weighing 0.75g α-bromoacetophenone and 0.44gKF, disperse with 5mLDMF and stir for 1min, then add the DMF solution obtained in step (2) (the mol ratio of KF, α-bromoacetophenone and fatty acid is controlled within the range of 8-6:4-3:...

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Abstract

The invention relates to an analysis method of carbon chain composition of cocoyl amino acid surfactants. The method comprises the following steps: hydrolysis is carried out for cocoyl amino acid / salt, coconut oil fatty acid is obtained, and HPLC analysis is carried out after derivatization. The analysis method is not influenced by kinds of amino acid surfactants, as long as the type of the surfactant accords with fatty acyl amino acid / salt; the analysis method has the advantages of simple operation, low cost, and high sensitivity, and the analysis method is not influenced by length of carbon chain.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a method for analyzing the carbon chain composition of cocoyl amino acid surfactants. Background technique [0002] As a typical fatty acyl amino acid surfactant, cocoyl amino acid / salt is made from natural amino acid and coconut oil. Excellent degradation performance, extremely low toxicity and irritation make it suitable for food, medicine, daily chemical and other industries. In the field of daily chemicals, cocoyl amino acid / salt has the characteristics of antistatic, bactericidal, good compatibility, and hard water resistance, and can be widely used in various liquids, creams, facial cleansers, masks, skin care products, toothpaste, Washing products, shampoo, shower gel and various soaps and other products. [0003] Cocoyl amino acid / salt is a mixed amino acid surfactant, mainly including caprylyl amino acid / salt, capryl amino acid / salt, lauroyl amino acid / salt, ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/027G01N2030/062G01N2030/067
Inventor 李泽勇钟国祯陈磊
Owner GUANGZHOU TINCI MATERIALS TECH
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