usnic acid


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us·nic acid

 (ŭs′nĭk)
n.
An antibacterial substance, C18H16O7, obtained from lichens of several genera, including Usnea.
References in periodicals archive ?
Variable responses of different human cancer cells to the lichen compounds parietin, atranorin, usnic acid and gyrophoric acid.
In particular, DS known to cause liver injury include Hydroxycut, Camellia sinensis (green tea extract), Herbalife products, usnic acid, LipoKinetix, 1,3-Dimethylamylamine, uncoupling protein-1, vitamin A, OxyELITE pro, and anabolic steroids [4].
Usnic acid used as a component in weight-loss products.
They also referred to other case reports and case series of liver transplantation occurring in individuals who had taken the supplements usnic acid, Herbalife, Hydroxycut, linoleic acid, black cohosh, Chinese herbs, kava kava, skullcap, ma huang, or bai fang herb.
These include zeorin, methyl-[beta]-orcinolcarboxylate, methylorsellinate [16, 35], sekikaic acid, salazinic acid, and dibenzofuran usnic acid [36].
Flavoparmelia euplecta has been reported to contain the dibenzofuran usnic acid and the depsidone protocetraric acid [47]; on the other hand, Myelochroa irrugans present as bioactive compounds the depside atranorin, the triterpenes zeorin and leucotylic acid, and the xanthone secalonic acid A [48]; and the main secondary metabolites in Parmelia omphalodes have been described to be the depsides atranorin, the depsidones salazinic and lobaric acids, and the acyclic fatty acid protolichesterinic acid [49].
Usnic acid [2,6-diacetyl-7,9-dihydroxy-1,3-dimethyl-8-9b (2H, 9[alpha]/[beta]H)-dibenzo-furandione; [C.sub.18][H.sub.16][O.sub.7]] is a compound of natural origin resulting from lichen secondary metabolism.
Purpose: The present study investigated the neuroactive properties of selected lichen compounds (atranorin, perlatolic acid, physodic acid and usnic acid), for their neurotrophic, neurogenic and acetylcholine esterase (AChE) activities.
It was once used to treat wounds as the usnic acid it contains has antibiotic properties; | Stereocaulon glareosum - a kind of coral lichen, it lives on bare toxic ground low in nutrients.
Two secondary metabolites (diffractaic acid and usnic acid) and extract of a lichen species, Usnea longissima Ach.
Usnic acid was initially used in the treatment of pulmonary tuberculosis (Plichet, 1955), and there are data regarding its biological activities as an antibiotic (Cocchietto et al., 2002), antiproliferative (Carderelli et al., 1997), analgesic and antipyretic (Okuyama et al., 1995), antiinflammatory (Vijayakumar et al., 2000), antiviral (Campanella et al., 2002; Scirpa et al., 1999), antifungal (Halama and Haluwin, 2004), against the parasite Trypanosoma cruzi (Carvalho et al., 2005) and as an immunologic modulator (Santos et al., 2004).