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Structure and Antioxidant Activities of Proanthocyanidins from Elephant Apple ( Dillenia indica Linn .)
Author(s) -
Fu Caili,
Yang Dongying,
Peh Wan Yi Elaine,
Lai Shaojuan,
Feng Xiao,
Yang Hongshun
Publication year - 2015
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/1750-3841.13005
Subject(s) - proanthocyanidin , chemistry , antioxidant , dimer , mass spectrum , electrospray ionization , mass spectrometry , nuclear chemistry , organic chemistry , polyphenol , chromatography
Proanthocyanidins were isolated and purified from fruits of elephant apple ( Dillenia indica Linn.) and their structural and bioactive properties were examined. Bate‐Smith alcoholysis, FTIR, and 13 C NMR spectra revealed that elephant apple proanthocyanidins (EAPs) contained a dominant amount of B‐type procyanidins (PC) with a minor amount of B‐type prodelphinidins (PD) but no A‐type interflavan linkage. 13 C NMR spectrum indicated that the cis isomer was dominant in EAPs. The electron spray ionization and matrix‐assisted laser desorption ionization time of flight mass spectra of EAPs showed the clear ion peaks corresponding to B‐type PC dimer to B‐type PD with degree of polymerization of 11. EAPs had strong antioxidant activity, which was evidenced by the high oxygen radical scavenging capacity at 1.06 × 10 4 μmol TE/g and ferric reducing antioxidant power of 2320 μmol Fe(II)/g. The results suggest that EAPs could be extracted to be used as promising functional food materials.