usnic acid

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usnic acid

[′əs·nik ′as·əd]
(biochemistry)
C18H16O7 Yellow crystals, insoluble in water, slightly soluble in alcohol and ether, melts about 198°C; found in lichens; used as an antibiotic. Also known as usninic acid.
References in periodicals archive ?
We found four lichen compounds (atranorin, perlatolic acid, physodic acid and usnic acid) that exhibited potent neurotrophic activity similar to that of a known neurotrophin, NGF.
The crude extract of lichen sample was filtered and stored at 4degC for 24 h to precipitate usnic acid (UA).
In previous studies performed in our laboratory, H1299 lung cancer cells were exposed to 29 [micro]M usnic acid for up to 48 hours (Mayer et al.
hossei Atranorin - Lecanoric acid - Usnic acid + Sekikaic acid + Salanizic acid - Terpenoids + Tannins + Saponins - Flavonoids - Steroids - Table 2: Antifungal activity of solvent extracts of R.
And still others--ephedra, usnic acid, kava--can be dangerous.
Usnic acid does this by preventing photosynthesis through a key enzyme involved in pigment biosynthesis," Nanayakkara says.
The active ingredients in Usnea are Usnic and Barbatic acids, two acids that are soluble in alcohol, but not in water.
Some authors believe that epiphytic lichens protect the trees they grow on, for they are at less risk from wood-rotting fungi because the lichens produce a series of specific acids, such as usnic acid and pulvinic acid, which show antibiotic activity against wood-destroying fungi.
The research collaboration will assess the ability of various dietary supplements, including black cohosh, green tea, ginko biloba, kava, usnic acid and potentially others, to affect various drug transporters.
Usnic acid inhibits breast tumor angiogenesis and growth by suppressing VEGFR2-mediated AKT and ERK1/2 signaling pathways.
Thallus Pd+ red, K+ yellow, contains fumarprotocetraric and usnic acids.
The usnic acid it contains is a potent antibiotic and antifungal agent.