Journal
FOOD CHEMISTRY
Volume 208, Issue -, Pages 61-67Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.03.079
Keywords
Ipomoea batatas leaves; alpha-Glucosidase; Antioxidant activity; Identification
Funding
- National Natural Science Foundation of China (NSFC) [21276118]
- Collaborative Innovation Center for Major Ecological Security Issues of Jiangxi Province and Monitoring Implementation [JXS-EW-00]
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Sweet potato (Ipomoea batatas) leaf (SPL) is an underused commercial vegetable with considerable bio-activities. By means of DPPH center dot scavenging ability and alpha-glucosidase inhibitory oriented isolation, 9 and 7 compounds were isolated and identified, respectively. Among them, trans-N-(p-coumaroyl)tyramine (1), trans-N-feruloyltyramine (2), cis-N-feruloyltyramine (3), 4,5-feruloylcourmaoylquinic acid (8), caffeic acid ethyl ester (10), 7-hydroxy-5-methoxycoumarin (11), 7,3'-dimethylquercetin (13) and indole-3-carboxaldehyde (15), were firstly identified from SPL, and four of them (1, 2, 3 and 10) were firstly identified from genus Ipomoea. Phenethyl cinnamides and 3,4,5-triCQA exhibited the strongest alpha-glucosidase inhibition, while 3,4,5-triCQA and diCQAs were the dominant antioxidants. Structure-activity relationship revealed that higher caffeoylation of quinic acid and lower methoxylation of flavonols resulted in stronger antioxidant activity, and methylation and cis-configuration structure of phenethyl cinnamides weaken the alpha-glucosidase inhibition. Aforementioned results could help to explain the antioxidant activity and anti-diabetic activity of SPL, and provide theoretical basis for its further application. (C) 2016 Elsevier Ltd. All rights reserved.
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