Chemical and antioxidant investigations: Norfolk pine needles (Araucaria excelsa).
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.
Michael
Helana N
HN
Chemistry of Tanning Materials and Leather Technology, National Research Centre, Dokki, Cairo, Egypt.
Awad
Hanem M
HM
El-Sayed
Nabil H
NH
Paré
Paul W
PW
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
D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols