文献类型: 外文期刊
作者: Lin, Sen;Yang, Bao;Duan, Xuewu;Jiang, Yueming;Li, Qing;Zhang, Mingwei;Shi, John
作者机构:
关键词: transformation;condensed tannin;A. awamori;litchi pericarp;antioxidant activity
期刊名称: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
ISSN: 1422-0067
年卷期: 2016 年 17 卷 7 期
页码:
收录情况: SCI
摘要: Condensed tannin is a ubiquitous polyphenol in plants that possesses substantial antioxidant capacity. In this study, we have investigated the polyphenol extraction recovery and 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity of the extracted polyphenol after litchi pericarp is treated with Aspergillus awamori, Aspergillus sojae or Aspergillus oryzae. We have further explored the activity of A. awamori in the formation of condensed tannin. The treatment of A. awamori appeared to produce the highest antioxidant activity of polyphenol from litchi pericarp. Further studies suggested that the treatment of A. awamori releases the non-extractable condensed tannin from cell walls of litchi pericarp. The total extractable tannin in the litchi pericarp residue after a six-time extraction with 60% ethanol increased from 199.92 +/- 14.47-318.38 +/- 7.59 g/g dry weight (DW) after the treatment of A. awamori. The ESI-TOF-MS and HPLC-MS2 analyses further revealed that treatment of A. awamori degraded B-type condensed tannin (condensed flavan-3-ol via C4-C8 linkage), but exhibited a limited capacity to degrade the condensed tannin containing A-type linkage subunits (C4-C8 coupled C2-O-C7 linkage). These results suggest that the treatment of A. awamori can significantly improve the production of condensed tannin from litchi pericarp.
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