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Method for measuring p-hydroxybenzoate in cosmetics

A technology for the determination of hydroxybenzoic acid esters and methods, which is applied in the field of determination of ingredients in cosmetics, can solve the problems of low analysis efficiency, high analysis cost, and high operation intensity, and achieve high analysis efficiency, low analysis cost, and easy operation. low intensity effect

Inactive Publication Date: 2013-05-22
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: provide a kind of assay method of paraben in cosmetics, to solve the above-mentioned analysis efficiency that prior art exists , Insufficient operation intensity and high analysis cost

Method used

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  • Method for measuring p-hydroxybenzoate in cosmetics
  • Method for measuring p-hydroxybenzoate in cosmetics
  • Method for measuring p-hydroxybenzoate in cosmetics

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Embodiment 1

[0061] A method for determining parabens in cosmetics, comprising the following steps:

[0062] A. Tested sample processing:

[0063] Weigh 1.00 g of the tested cosmetic shampoo and body wash respectively into a stoppered test tube, add 10.0 mL of methanol to oscillate to disperse, extract by ultrasonic wave for 15 min; rotate at 4000 rps, centrifuge for 10 min, take the supernatant and filter to obtain the filtrate; The absorbance of the filtrate is in the linear range, quantitatively pipette the filtrate, dilute with methanol to 10.0mL to obtain the dilution;

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Abstract

The invention discloses a method for measuring p-hydroxybenzoate in cosmetics and relates to a method for measuring components in cosmetics. The method comprises the following steps: A, performing tested sample treatment, namely preparing the tested cosmetics into diluent; B, performing spectral measurement, namely B1, preparing a background spectrum set, B2, determining the standard spectrum of p-hydroxybenzoate, and B3, performing spectral measurement on the tested cosmetics; C, performing positive test and content measurement, namely C1, performing positive test, calculating an included angle between the merged matrix and the standard spectrum of p-hydroxybenzoate, when the included angle is larger than 0.15, the p-hydroxybenzoate is judged to be negative, and the spectrum of the tested cosmetics is recorded into the background spectrum database, and when the included angle is smaller than 0.1, the p-hydroxybenzoate is stored in the tested cosmetics, the sample is positive, and continuing, and C2 performing content measurement, namely deducing the standard spectrum of p-hydroxybenzoate from the spectrum of the tested cosmetics, thereby obtaining the actual content of the p-hydroxybenzoate. The method is high in analysis efficiency, low in operation strength, low in analysis cost, high in robustness and easy to popularize and use.

Description

technical field [0001] The invention relates to a method for determining components in cosmetics, in particular to a method for determining preservative parabens in cosmetics. Background technique [0002] Preservatives have a good inhibitory effect on various harmful microorganisms in cosmetics, but they have certain toxic and side effects on human skin and other organs. The national "Hygienic Standards for Cosmetics" stipulates the limited range of use of preservatives. Parabens, that is, parabens, are relatively common preservatives in cosmetics at present, and their analysis methods are mainly chromatographic methods, including thin-layer chromatography, gas chromatography, and high-performance liquid chromatography (HPLC). and capillary electrophoresis, etc. When gas chromatography is used to determine polar substances such as hydroxyl and carboxyl, it generally needs to undergo methyl silylation and derivatization before using gas chromatography for qualitative and qu...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 粟晖姚志湘方凤陈成刘柳黄丽梅梁晓梅
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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