title: Free radical-scavenging delta-lactones from Boletus calopus.
abstract: The methanol extracts from the fruiting body of the mushroom Boletus calopus showed free radical-scavenging activity. Bioactivity-guided fractionation of the methanol extracts led to a new hydroxylated calopin named calopin B, along with the known delta-lactones calopin and cyclocalopin A. The structure of the new calopin analogue was elucidated by spectroscopic methods. All compounds showed potent free radical-scavenging activity against superoxide, DPPH, and ABTS radicals with IC (50) values of 1.2 - 5.4 microg/mL.
authors.affiliation: Functional Metabolomics Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea.
authors.forename: Jin-Woo
authors.initials: JW
authors.lastname: Kim
authors.forename: Ick-Dong
authors.initials: ID
authors.lastname: Yoo
authors.forename: Won-Gon
authors.initials: WG
authors.lastname: Kim
mesh_terms: D000363:Agaricales; D052160:Benzothiazoles / Q000737:chemistry; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D006801:Humans; D020128:Inhibitory Concentration 50; D007783:Lactones / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use; D008517:Phytotherapy; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D013329:Structure-Activity Relationship; D013451:Sulfonic Acids / Q000737:chemistry; D013481:Superoxides / Q000737:chemistry
chemical_list: D052160:Benzothiazoles; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D007783:Lactones; D010851:Picrates; D010936:Plant Extracts; D013451:Sulfonic Acids; D013481:Superoxides; C002502:2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid; C004931:1,1-diphenyl-2-picrylhydrazyl