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- W2017666089 abstract "Clinical evidence suggests that administration of Hypericum perforatum (Hp) extracts containing the photo-activated hypericin compounds may cause fewer skin photosensitization reactions than administration of pure hypericin. This study was conducted to determine whether the phototoxicity of hypericin in HaCaT keratinocytes could be attenuated by H. perforatum extracts and constituents. Two extracts, when supplemented with 20 μM hypericin: (1) an ethanol re-extraction of residue following a chloroform extraction (denoted ethanol(-chloroform)) (3.35 μM hypericin and 124.0 μM total flavonoids); and (2) a chloroform extract (hypericin and flavonoids not detected), showed 25% and 50% (p < 0.0001) less phototoxicity than 20 μM hypericin alone. Two H. perforatum constituents, when supplemented with 20 μM hypericin: (1) 10 μM chlorogenic acid; and (2) 0.25 μM pyropheophorbide, exhibited 24% (p < 0.05) and 40% (p < 0.05) less phototoxicity than 20 μM hypericin alone. The peroxidation of arachidonic acid was assessed as a measure of oxidative damage by photo-activated hypericin, but this parameter of lipid peroxidation was not influenced by the extracts or constituents. However α-tocopherol, a known antioxidant also did not influence the amount of lipid peroxidation induced in this system. These observations indicate that hypericin combined with H. perforatum extracts or constituents may exert less phototoxicity than pure hypericin, but possibly not through a reduction in arachidonic acid peroxidation." @default.
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- W2017666089 date "2006-11-01" @default.
- W2017666089 modified "2023-10-18" @default.
- W2017666089 title "Reduction in hypericin-induced phototoxicity by Hypericum perforatum extracts and pure compounds" @default.
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- W2017666089 doi "https://doi.org/10.1016/j.jphotobiol.2006.06.001" @default.
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