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Int. J. Mol. Sci. 2016, 17(7), 1067; doi:10.3390/ijms17071067

Transformation of Litchi Pericarp-Derived Condensed Tannin with Aspergillus awamori

1
Key Laboratory of Plant Resource Conservation and Sustainable Utilization/Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
2
Wenzhou Institute of Biomaterials and Engineering (in Preparation), Chinese Academy of Science, Wenzhou 325000, China
3
Sericultural & Agri-Food Research Institute, Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods, Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing, Guangzhou 510610, China
4
Guelph Research and Development Center, Agriculture and Agri-Food Canada, Guelph, ON N1G 5C9, Canada
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: David Arráez-Román and Maurizio Battino
Received: 28 March 2016 / Revised: 22 June 2016 / Accepted: 24 June 2016 / Published: 12 July 2016
(This article belongs to the Section Bioactives and Nutraceuticals)
View Full-Text   |   Download PDF [1240 KB, uploaded 12 July 2016]   |  

Abstract

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 μg/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. View Full-Text
Keywords: transformation; condensed tannin; A. awamori; litchi pericarp; antioxidant activity transformation; condensed tannin; A. awamori; litchi pericarp; antioxidant activity
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Lin, S.; Li, Q.; Yang, B.; Duan, X.; Zhang, M.; Shi, J.; Jiang, Y. Transformation of Litchi Pericarp-Derived Condensed Tannin with Aspergillus awamori. Int. J. Mol. Sci. 2016, 17, 1067.

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