Composition and combination of bmdbm photostabilizers and sunscreens
A technology of butylmethoxydibenzoylmethane and ethylhexyloxyphenolmethoxyphenyltriazine, which can be used in drug combinations, preparations for skin care, active ingredients of heterocyclic compounds, etc., can solve cross-allergies, Contact eczema and other problems, to achieve the effect of good absorption and response
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[0098] In Vitro Method for Assessing Overall UV and UVA Photostability
[0099] A) material
[0100] -UV spectrophotometer:
[0101] The spectrophotometer measures the spectral transmittance through the panel with and without a layer of sunscreen composition on the surface.
[0102] The spectrophotometer should allow measurements between 290nm and 400nm. In order to reduce the variability between measurement readings and to compensate for the lack of uniformity of the product layer, it is recommended that the reading area of the site is at least 0.5cm 2 .
[0103] The spectrophotometer used for these measurements was UV-1000S or 2000S.
[0104] -plate:
[0105] A panel is the material on which the sunscreen composition is applied. The material must be UV transparent, non-fluorescent, photostable and inert with respect to the compound of the composition being tested. For this solution, polymethylmethacrylate (PMMA) sheets proved ideal.
[0106] -UV source:
[0107]...
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