title: Chemical and antioxidant investigations: Norfolk pine needles (Araucaria excelsa).
abstract: Chemical investigations from a foliar extract of Araucaria excelsa (Lamb.) (Araucariaceae) resulted in the identification of seven phenolic metabolites including one flavananol, one flavananol 3-O-glycoside, four C-glycoside flavonoids, and one phenolic acid. Structures were elucidated by spectral determination including: UV, NMR and MS analysis. Moderate antioxidant activity was observed with a 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay in comparison with the reference antioxidant ascorbic acid.
authors.affiliation: Chemistry of Tanning Materials and Leather Technology, National Research Centre, Dokki, Cairo, Egypt.
authors.forename: Helana N
authors.initials: HN
authors.lastname: Michael
authors.forename: Hanem M
authors.initials: HM
authors.lastname: Awad
authors.forename: Nabil H
authors.initials: NH
authors.lastname: El-Sayed
authors.forename: Paul W
authors.initials: PW
authors.lastname: Paré
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification; D028223:Pinus; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification*; D018515:Plant Leaves; D059808:Polyphenols
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols