Structural diversity and antioxidant activity of condensed tannins fractionated from mangosteen pericarp

Hai Chao Zhou, Yi Ming Lin, Shu Dong Wei, Nora Fung Yee Tam

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

The extract from mangosteen pericarp was separated into eight fractions, four by solvent extraction (hexane, FH; petroleum ether, FP; ethyl acetate, FE; water, FW) and the other four by fractionation on Sephadex LH-20 column (fractions F1, F2, F3, and F4). Phenolic compounds were identified as the major antioxidant components in each fraction. UV-VIS spectrum, reversed-phase HPLC-ESI-MS coupled with thiolysis, normal-phase HPLC-ESI-MS and MALDI-TOF-MS analyses complementally showed that the phenolic-rich fractions were condensed tannins with structural heterogeneity in monomer units, degree of polymerization and interflavan linkages. Mangosteen condensed tannins predominately contained procyanidins with a significant amount of propelargonidin but much lower signals of prodelphinidin. Eicosapentamers of condensed tannins were detected by MALDI-TOF-MS. Both B-type and A-type linkages were present. Condensed tannins fractions from mangosteen pericarp, especially fractions F3 and FE, can be explored as beneficial food antioxidants because of their high yields and potent antioxidant activities.

Original languageEnglish
Pages (from-to)1710-1720
Number of pages11
JournalFood Chemistry
Volume129
Issue number4
DOIs
Publication statusPublished - 15 Dec 2011
Externally publishedYes

Keywords

  • Antioxidant activity
  • Condensed tannins
  • Degree of polymerization
  • Fractionation
  • Mangosteen pericarp
  • Structure-activity

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