PubMed · 5509019
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N K Bhide. 1970. Some general problems concerning research on medicinal plants.. https://pubmed.ncbi.nlm.nih.gov/5509019/
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Some dozens of ultraviolet absorbents were extracted from leaves of pure natural plants, such as frangipani, mango, and sweet-scented osmanthus. Then the spectral properties of these ultraviolet absorbents were analyzed. The plant that has the best effect of absorbing ultraviolet ray was selected by comparing one with the others. And the method of extracting ultraviolet absorbent was studied. The results showed that the method, which used leaves of mango as material, distilled water as extracted solvent, and alcohol as precipitator, was satisfactory. When the concentration of ultraviolet absorbent solution is 1% (w/w), the ultraviolet ray transmission is smaller than 1% in 200-400 nm. The rate of production is 1.5%. It is innoxious.
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