title: 4-Nerolidylcatechol from Pothomorphe spp. scavenges peroxyl radicals and inhibits Fe(II)-dependent DNA damage.
abstract: The total reactive antioxidant potential (TRAP) and total antioxidant reactivity (TAR) of 4-nerolidylcatechol (4-NC) and methanolic extracts of Pothomorphe umbellata and P. peltata were determined by monitoring the intensity of luminol enhanced chemiluminescence by peroxyl radicals derived from thermolysis of 2,2'-azobis(2-amidinopropane). The highest antioxidant potential was measured in the extract of P. umbellata (TRAP = 97.2 microM) while the highest reactivity was observed in the extract of P. peltata (TAR = 5.0 microM), measured as equivalents of Trolox concentration. These results were higher than those obtained for 4-NC (TRAP = 33.6 microM, TAR = 4.9 microM). DNA sugar damage induced by Fe(II) salts was also used to determine the capacity of 4-NC to suppress hydroxyl radical-mediated degradation of DNA. Calculated IC50 values for 4-NC and catechin, used as a standard, were 25 and 17 microM, respectively.
authors.affiliation: Cátedra de Microbiología Industrial y Biotecnología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina.
authors.forename: C
authors.initials: C
authors.lastname: Desmarchelier
authors.forename: S
authors.initials: S
authors.lastname: Barros
authors.forename: M
authors.initials: M
authors.lastname: Repetto
authors.forename: L R
authors.initials: LR
authors.lastname: Latorre
authors.forename: M
authors.initials: M
authors.lastname: Kato
authors.forename: J
authors.initials: J
authors.lastname: Coussio
authors.forename: G
authors.initials: G
authors.lastname: Ciccia
mesh_terms: D002396:Catechols / Q000302:isolation & purification / Q000494:pharmacology*; D004249:DNA Damage; D005296:Ferrous Compounds / Q000633:toxicity*; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry*
chemical_list: C110583:4-nerolidylcatechol; D002396:Catechols; D005296:Ferrous Compounds; D016166:Free Radical Scavengers