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Method for measuring protection of sunscreen cosmetic

A technology of cosmetics and testing methods, which is applied in the measurement of color/spectral characteristics, etc., can solve problems such as poor repeatability, high testing costs, and long testing time, and achieve high accuracy and sensitivity, improve reliability, and rapid detection.

Inactive Publication Date: 2014-02-19
中山鼎晟生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many methods for evaluating the protective effect of sunscreen cosmetics, including SPF (sunprotection factor) value human body test method, in vitro SPF value determination method, UVA protective effect evaluation method, Lab colorimetric system erythema test method, British plate film method, Peeling skin penetration method and marmot method, etc. Human body method is used to evaluate the sunscreen effect of cosmetics as much as possible to simulate the actual use conditions. The results have high reliability, but the test cost is high, professional operation is required, and the test time is long. Poor repeatability, other testing methods also require specialized equipment, instruments or biological samples, and the operation is cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Divide 10ml of purified water into two parts, add 1mg of the cosmetic (sunscreen) to one part and mix well to obtain the test solution, and the other part as a blank control solution;

[0028] (2) Install the integrating sphere with the highly reflective barium sulfate on the inner wall between the quartz absorption cell and the photomultiplier tube detector in the UV-visible spectrophotometer; use sunlight as the light source, and scan the wavelength range of the UV-visible spectrophotometer Adjust to 280~400nm, add the blank control solution into the quartz absorption cell in the UV-visible spectrophotometer, perform blank calibration on the UV-visible spectrophotometer, and adjust the instrument so that the absorbance of the blank control solution is 0.

[0029] (3) Remove the blank control solution, add the solution to be tested into the quartz absorption cell in the UV-Vis spectrophotometer, detect the solution to be tested, and measure the ultraviolet absorptio...

Embodiment 2

[0033] (1) Divide 20ml of purified water into two parts, add 5mg of the cosmetic (sunscreen lotion) to one part and mix evenly to obtain the test solution, and the other part is used as a blank control solution;

[0034] (2) Install the integrating sphere containing polytetrafluoroethylene, a highly reflective material on the inner wall, between the quartz absorption cell and the silicon cross diode array detector in the UV-visible spectrophotometer; Adjust the scanning wavelength range to 280-400nm, add the blank control solution into the quartz absorption cell in the UV-visible spectrophotometer, perform blank calibration on the UV-visible spectrophotometer, and adjust the instrument so that the absorbance of the blank control solution is 0.

[0035] (3) Remove the blank control solution, add the solution to be tested into the quartz absorption cell in the UV-Vis spectrophotometer, detect the solution to be tested, and measure the ultraviolet absorption spectrum and absorbanc...

Embodiment 3

[0038] (1) Divide 16ml of acetone into two parts on average, add 3mg of the cosmetic (sunscreen) to one part and mix evenly to obtain the test solution, and the other part is used as a blank control solution;

[0039] (2) Install the integrating sphere with the highly reflective barium sulfate on the inner wall between the quartz absorption cell and the photomultiplier tube detector in the UV-visible spectrophotometer; use sunlight as the light source, and scan the wavelength range of the UV-visible spectrophotometer Adjust to 280~400nm, add the blank control solution into the quartz absorption cell in the UV-visible spectrophotometer, perform blank calibration on the UV-visible spectrophotometer, and adjust the instrument so that the absorbance of the blank control solution is 0.

[0040] (3) Remove the blank control solution, add the solution to be tested into the quartz absorption cell in the UV-Vis spectrophotometer, detect the solution to be tested, and measure the ultravi...

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Abstract

The invention relates to a method for measuring protection of a sunscreen cosmetic, which is characterized by comprising the following steps: a solution to be tested and a blank reference solution containing no cosmetic to be measured are prepared; then an integrating sphere is arranged between an absorption pond and a detector in an ultraviolet-visible spectrophotometer, the blank reference solution is employed for blank correction on the ultraviolet-visible spectrophotometer; the solution to be tested is added in the absorption pond of the ultraviolet-visible spectrophotometer finally, the solution to be tested is tested, the ultraviolet absorption spectrum of the solution to be tested is measured, and the cosmetic to be measured has better protection effect due to higher absorbance. According to the invention, the ultraviolet-visible spectrophotometer of the integrating sphere is increased for measuring the absorbance of the cosmetic to be measured, thereby the sunscreen effect of the cosmetic to be measured can be measured, the measurement method has the advantages of simple operation, low measurement cost, high credibility and accuracy, and easy popularization and application.

Description

technical field [0001] The invention belongs to the detection field of cosmetics, and in particular relates to a method for measuring the protective efficacy of sunscreen cosmetics. Background technique [0002] Ultraviolet rays in the sun are a kind of electromagnetic wave, whose wavelength is distributed between 200nm and 400nm, which can pass through the skin and produce a series of biochemical reactions, including beneficial and harmful. Synthetic, it has a significant bactericidal and disinfecting effect on the skin, therefore, it plays an important role in the prevention of ultraviolet rays on human health and diseases. With the development of skin science and people's further understanding of ultraviolet rays, research has found that UVB with a wavelength of 280nm to 320hm and UVA with a wavelength of 320nm to 400hm can penetrate the skin. The stratum corneum and cortex reach the subcutaneous tissue, thereby causing lasting photooxidative damage to the skin, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 郭狄
Owner 中山鼎晟生物科技有限公司
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