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Molecules 2015, 20(1), 542-555; doi:10.3390/molecules20010542

Phenolic Composition from Different Loquat (Eriobotrya japonica Lindl.) Cultivars Grown in China and Their Antioxidant Properties

1,2
,
1,2
,
1,2,3
,
1,2,3,* and 1,2,3
1
Laboratory of Fruit Quality Biology, Zhejiang University, Zijingang Campus, Hangzhou 310058, Zhejiang, China
2
The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou 310058, Zhejiang, China
3
Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang University, Zijingang Campus, Hangzhou 310058, Zhejiang, China
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 8 December 2014 / Accepted: 25 December 2014 / Published: 5 January 2015
(This article belongs to the Section Natural Products)
View Full-Text   |   Download PDF [1165 KB, uploaded 5 January 2015]   |  

Abstract

China is one of the most important centers of diversity for Eriobotrya japonica Lindl. in the world. In this study, seven loquat cultivars grown in China were evaluated for their phenolic compounds and antioxidant activity. Eleven phenolic compounds, i.e., 3-p-coumaroylquinincacid (3-p-CoQA), 5-caffeoylquinic acid (5-CQA), 4-caffeoylquinic acid (4-CQA), 3-caffeoylquinic acid (3-CQA), 5-feruloylquinic acid (5-FQA), quercetin-3-O-galactoside (Q-3-Gal), quercetin-3-O-glucoside (Q-3-Glu), quercetin-3-O-rhamnoside (Q-3-Rha), kaempferol-3-O-galactoside (K-3-Gal), kaempferol-3-O-rhamnoside (K-3-Rha), and kaempferol-3-O-glucoside (K-3-Glu) were identified and quantified in the peel and pulp of the cultivars tested. 3-CQA and 5-CQA were the predominant components in both fruit parts. 2,2-Diphenyl-1-picrylhydrazyl radicals (DPPH), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate (ABTS), and ferric reducing antioxidant power (FRAP) assays were used for the antioxidant evaluation. Results showed that peel extracts had higher antioxidant activities than their pulp counterparts in all the cultivars tested, which was correlated with their higher total phenolic contents. The antioxidant potency composite (APC) index showed obvious variations ranging from 64.15 to 100 in the peel and from 59.49 to 97.95 in the pulp of different cultivars, where “Dahongpao” (DHP) and “Luoyangqing” (LYQ) had the highest APC index in the peel and pulp, respectively. Overall, loquat cultivars rich in hydroxycinnamic acids (HCAs) such as 3-p-CoQA, 5-CQA, 4-CQA, 3-CQA and 5-FQA showed relatively higher antioxidant activities, and may be excellent sources of phytochemicals and natural antioxidants. View Full-Text
Keywords: Eriobotrya japonica Lindl.; cultivars; phenolic compounds; antioxidant properties Eriobotrya japonica Lindl.; cultivars; phenolic compounds; antioxidant properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, W.; Zhao, X.; Sun, C.; Li, X.; Chen, K. Phenolic Composition from Different Loquat (Eriobotrya japonica Lindl.) Cultivars Grown in China and Their Antioxidant Properties. Molecules 2015, 20, 542-555.

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