Antioxidant Tannins from Stem Bark and Fine Root of Casuarina equisetifolia

Molecules

Shang-Ju Zhang¹  Yi-Ming Lin¹  Hai-Chao Zhou¹  Shu-Dong Wei¹  Guang-Hui Lin¹ 

[1] ¹Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China ²Fujian Academy of Forestry, Fuzhou 350012, China

关键词: Casuarina equisetifolia;    condensed tannins;    MALDI-TOF MS;    HPLC;    antioxidant activity;   

DOI  :  10.3390/molecules15085658

来源: mdpi

【 摘 要 】

Structures of condensed tannins from the stem bark and fine root of Casuarina equisetifolia were identified using MALDI-TOF MS and HPLC analyses. The condensed tannins from stem bark and fine root consist predominantly of procyanidin combined with prodelphinidin and propelargonidin, and epicatechin is the main extension unit. The condensed tannins had different polymer chain lengths, varying from trimers to tridecamer for stem bark and to pentadecamer for fine root. The antioxidant activities were measured by two models: 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing/ antioxidant power  (FRAP). The condensed tannins extracted from C. equisetifolia showed very good DPPH radical scavenging activity and ferric reducing/ antioxidant power, suggesting that these extracts may be considered as new sources of natural antioxidants for food and nutraceutical products.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.