Chemical and antioxidant investigations: Norfolk pine needles (Araucaria excelsa)

Helana N. Michael, Hanem M. Awad, Nabil H. El-Sayed, Paul W. Paré

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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.

Original languageEnglish
Pages (from-to)534-538
Number of pages5
JournalPharmaceutical Biology
Issue number5
StatePublished - May 2010


  • Antioxidants
  • Araucaria excelsa
  • Araucariaceae
  • DPPH
  • Flavonoids
  • Needles
  • Norfolk pine
  • Phenolics


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