Variation in antioxidant activity of extracts of Acacia confusa of different ages

Yu Tang Tung, Shang Tzen Chang

Research output: Contribution to journalArticle

6 Citations (Scopus)


The antioxidant activity of extracts of Acacia confusa of different ages has been evaluated. Ethanolic extracts of bark, twigs, branches (2- and 5 cm-diameter branch-bark, 2- and 5 cm-diameter branch-wood), and leaves of 15-, 25-, and 35-year-old A. confusa were examined. Results indicate that the ethanolic extracts of 5 cm-diameter branch-bark and bark of A. confusa exhibited stronger antioxidant activities, and higher phenolic and proanthocyanidin contents than the other plant parts. Furthermore, twig, 2 cm-diameter branch-wood, 2 cm-diameter branch-bark, and 5 cm-diameter branch-wood extracts of 35-year-old specimens showed better antioxidant activities and higher phenolic contents, followed by the 25- and 15-year-old specimens tested. This reveals that the composition of extracts and their differential antioxidant activities are dependent on the age of A. confusa. In addition, the total phenolic content of A. confusa ethanolic extracts has a high positive correlation with the DPPH free-radical scavenging activity (R2 = 0.83), superoxide radical-scavenging activity (R2 = 0.66), ferrous ion-chelating effect (R2 = 0.67), and reducing power (R2 = 0.92).

Original languageEnglish
Pages (from-to)73-76
Number of pages4
JournalNatural Product Communications
Issue number1
Publication statusPublished - 2010
Externally publishedYes



  • Acacia confusa
  • Antioxidant activity
  • Different growth ages
  • Phenolic content
  • Proanthocyanidin content

ASJC Scopus subject areas

  • Plant Science
  • Complementary and alternative medicine
  • Drug Discovery
  • Pharmacology

Cite this