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Liquid phase detection method for fatty acid residues in amino acid surfactants
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A technology of surfactants and amino acids, which is applied in the field of analysis and detection, can solve the problems of large relative molecular mass and high boiling point, and achieve the effects of short time consumption, high accuracy and improved sensitivity
Active Publication Date: 2019-04-30
GUANGZHOU TINCI MATERIALS TECH
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However, there are great limitations in the determination of fatty acid components with high boiling point, large relative molecular mass and non-volatile
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Embodiment 1
[0036] This embodiment is used to illustrate the liquid phase detection method of fatty acid residue in a kind of cocoyl glycinate potassium of the present invention, comprises the steps:
[0037] (1) Reagent preparation:
[0038] Standard solution 1: Prepare acetone solutions containing 500mg / L caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid;
[0039] Standard solution 2: Prepare acetone solutions containing 200mg / L caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid respectively;
[0040] Standard solution 3: Prepare acetone solutions containing 100 mg / L caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid;
[0041] Standard solution 4: prepare acetone solutions containing 50 mg / L caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid and stearic acid;
[0042] Standard solution 5: Prepare acetone solutions containing 25mg / L caprylic acid, capric acid,...
Embodiment 2
[0074] This embodiment is used to illustrate the liquid phase detection method of fatty acid residue in a kind of cocoyl alaninate sodium of the present invention, and detection step is consistent with embodiment 1, repeats no more.
[0075] The fatty acid residual repeatability data measured in the same batch of cocoyl alanine sodium are as follows:
[0076]
[0077] The data of recovery rate of standard addition are as follows:
[0078]
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Abstract
The invention discloses a method for detecting fatty acid residue in an amino acid surfactant; the method comprises: acidifying the surfactant with an inorganic acid; extracting organic matters by using C18 SPE (solid phase extraction) micro-column, and eluting the organic matters from the micro-column by using an organic solvent; using 2-bromoacetophenone solution and organic amine as derivatization reagents to carry out derivatization and eluting to obtain organic matters; carrying out HPLC (high performance liquid chromatography) analysis. The method of the invention is low in time consumption, simple to perform, high in accuracy, independent of fatty acid type, and applicable to the fatty acid residue detection for all amino acid surfactants.
Description
technical field [0001] The invention relates to the technical field of analysis and detection, in particular to a liquid-phase detection method for fatty acid residues in amino acid surfactants. Background technique [0002] The most widely used amino acid surfactants on the market are mainly anionic. It is very mild and has excellent foaming ability, and is widely used in personal care products such as shampoos, body washes, and facial cleansers. Suitable for sensitive skin, the skin feels soft and comfortable after use. [0003] At present, the industry adopts Schotten-Baunmann (Schotten-Baunmann) condensation method to produce amino acid surfactants, that is, fatty acyl chlorides and amino acids are reacted in alkaline water / hydrophilic organic solvent mixed phase to obtain fatty acyl amino acid salts. Then the fatty acylamino acid is separated by acidification with inorganic acid, and then neutralized with alkali to become a relatively pure fatty acylamino acid salt. ...
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