title: Cyclooxygenase enzyme inhibitory compounds with antioxidant activities from Piper methysticum (kava kava) roots.
abstract: Cyclooxygenase enzyme inhibitory assay-guided purification of ethyl acetate extract of Piper methysticum (kava kava) roots yielded six biologically active compounds (1-7), which were purified using MPLC, preparative TLC and HPLC methods. These compounds were also evaluated for antioxidant activities. Dihydrokawain (1) and yangonin (6) showed the highest COX-I and COX-II inhibitory activities at 100 microg/ml, respectively. The lipid oxidation assay did not reveal antioxidant activities for demethoxyangonin (2), dihydrokawain (1), kawain (4), dihydromethysticin (5) or methysticin (7) at 50 microg/ml. The antioxidant activities of flavokawain A (3) and yangonin (6) could not be tested in the lipid oxidation assay due to solubility problems. However, yangonin and methysticin showed moderate antioxidant activities in the free radical scavenging assay at 2.5 mg/ml.
authors.affiliation: Department of Horticulture and National Food Safety and Toxicology Center, Michigan State University, East Lansing 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Wu
authors.forename: L
authors.initials: L
authors.lastname: Yu
authors.forename: M G
authors.initials: MG
authors.lastname: Nair
authors.forename: D L
authors.initials: DL
authors.lastname: DeWitt
authors.forename: R S
authors.initials: RS
authors.lastname: Ramsewak
mesh_terms: D000893:Anti-Inflammatory Agents / Q000737:chemistry / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D001713:Biphenyl Compounds; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D007527:Isoenzymes / Q000187:drug effects*; D020901:Kava; D008565:Membrane Proteins; D008517:Phytotherapy; D010851:Picrates; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018517:Plant Roots; D011451:Prostaglandin-Endoperoxide Synthases / Q000187:drug effects*
chemical_list: D000893:Anti-Inflammatory Agents; D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D007527:Isoenzymes; D008565:Membrane Proteins; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases