Research paper Botanica Pacifica. A journal of plant science and conservation Preprint Article first published online: 06 NOV 2015 | DOI: 10.17581/bp.2016.05101 Anti-lipoxygenase, Radical Scavenging and Antimicrobial Activities of Lichen Species of Genus Heterodermia (Physciaceae) Bhaskar C. Behera, Mangesh V. Morey & Subhash B. Gaikwad Agharkar Research Institute, G.G. Agarkar Road, Pune – 411004, India The aim of the research is to explore antilipoxygenase, radical scavenging and antimicrobial activity of the ethyl acetate extract of the selected lichen species of genus Heterodermia (Physciaceae). The species extract have shown concentration dependent lipoxygenase (LOX) inhibition. Fifty percent (IC50) LOX inhibition was obtained by H. diademata, H. flabellata, H. antillarum and H. incana with 0.123, 0.153, 0.160, 0.150 mg/ml respectively; which is smaller than the synthetic antioxidant BHA and BHT. Only the extract of H. diademata showed IC50, 0.123 mg/ml is equal to LOX inhibitor Indomethicin. The LOX inhibition kinetics with respect to the lichen extract resulted different mode of inhibition. Competitive inhibition was found towards LOX by H. albicans, H. antillarum; uncompetitive inhibition by H. diademata and noncompetitive inhibition showed by H. angustiloba, H. flabellata, H. incana, H. isidiophora and H. pseudospeciosa. These species extract have also showed ≤50 % radical scavenging activity. The ethyl acetate extract of H. diademata, H. angustiloba, H. albicans and H. isidiophora showed the strong antimicrobial activity against most of the tested microorganisms at concentration ranging from 0.232 mg/ml to 0.591 mg/ml. These findings suggest that these lichen species of genus Heterodermia can be used as new bioresources for the natural lipoxygenase inhibitor with antimicrobial and radical scavenging features. Бехера Б.С., Мори М.В., Гайквад С.Б. Антилипоксигеназа, радикальная очистка и антимикробная активность лишайников рода Heterodermia (Physciaceae). Цель исследования – антилипоксигеназа, радикальная очистка и антимикробная активность этилацетатного экстракта видов лишайников рода Heterodermia (Physciaceae). Экстрактам видов рода свойсвенно липоксигеназное ингибирование (LOX), зависящее от концентрации. Пятидесятипроцентное (IC50) ингибирование LOX отмечалось у видов H. diademata, H. flabellata, H. antillarum и H. incana при концентрациях 0,123 0,153, 0,160 и 0,150 мг/мл соответственно; что меньше, чем у синтетических антиоксидантов BHA и BHT. Только экстракт H. diademata показал IC50 при концентрации 0,123 мг/мл равным LOX ингибитора индометацин. Кинетика LOX ингибирования экстрактов разных видов лишайников показывает разный режим ингибирования. Конкурентное ингибирование LOX отмечено у H. albicans и H. antillarum; неконкурентое – у H. diademata; отсутствие конкуренции характерно для H. angustiloba, H. flabellata, H. incana, H. isidiophora и H. pseudospeciosa. Экстракты этих видов также показали пятидесятипроцентную активность радикальной очистки. Этилацетатные экстракты H. diademata, H. angustiloba, H. albicans и H. isidiophora показали сильную антимикробную активность в отношении большинства протестированных микроорганизмов в концентрациях от 0,232 до 0,591 мг/мл. Результаты показывают, что виды лишайников Heterodermia могут быть использованы в качестве нового биоресурса природной липоксигеназы с антимикробными и очистительными свойствами. Keywords: Heterodermia, lipoxygenase inhibition, antioxidant, antimicrobial activity, липооксигиназное ингибирование, антиоксидант, антимикробная активность References Baladrin M.F., Klocke J.A. & Wurtele E.S. 1985. Natural plant chemicals: sources of industrial and medicinal plants. 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