title: Inhibitory activity of xanthine oxidase and superoxide-scavenging activity in some taxa of the lichen family Graphidaceae.
abstract: Results on the screening of species of the lichen family Graphidaceae for superoxide-scavenging activity (SSA) and xanthine-oxidase inhibitory (IXO) activity have been presented. The potential of the extracts for scavenging of superoxide and inhibition of xanthine-oxidase under various physiological conditions has been evaluated. The methanolic extracts of the species of family Graphidaceae showed inhibitory properties of xanthine oxidase (IC50 = 2.0 to 5.26 microg/ml) with an additional superoxide scavenging capacity (IC50 = 3.63 to 13.88 microg/ml). The potential of the methanolic extracts for scavenging of superoxide and inhibition of xanthine oxidase remained stable at 4 degrees C. Thus the extracts can be maintained for longer periods for their therapeutic uses.
mesh_terms: D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D016166:Free Radical Scavengers / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D020128:Inhibitory Concentration 50; D008011:Lichens; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D013481:Superoxides / Q000378:metabolism*; D014969:Xanthine Oxidase / Q000037:antagonists & inhibitors / Q000187:drug effects*
chemical_list: D004791:Enzyme Inhibitors; D016166:Free Radical Scavengers; D010936:Plant Extracts; D013481:Superoxides; D014969:Xanthine Oxidase