期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 62, 期 39, 页码 9576-9585出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf502912t
关键词
juice; phenolics; vitamin C; antioxidant activity; alpha-glucosidase inhibitory activity; Barringtonia racemosa; Phyllanthus acidus
资金
- Universiti Sains Malaysia [1001/PBIOLOGI/813049]
The present study compared pH, total soluble solids, vitamin C, and total phenolic contents, antioxidant activities, and alpha-glucosidase inhibitory activities of 40 fresh juices. The juice of Baccaurea polyneura showed the highest yield (74.17 +/- 1.44%) and total soluble solids (32.83 +/- 0.27 degrees Brix). The highest and lowest pH values were respectively measured from the juices of Dimocarpus longan (6.87 +/- 0.01) and Averrhoa bilimbi (1.67 +/- 0.67). The juice of Psidium guajava gave the highest total phenolic (857.24 +/- 12.65 mu g GAE/g sample) and vitamin C contents (590.31 +/- 7.44 mu g AAE/g sample). The juice of Phyllanthus acidus with moderate contents of total phenolics and vitamin C was found to exhibit the greatest scavenging (613.71 +/- 2.59 mu g VCEAC/g sample), reducing (2784.89 +/- 3.93 mu g TEAC/g sample), and alpha-glucosidase inhibitory activities (95.37 +/- 0.15%). The juice of Barringtonia racemosa was ranked second in the activities and total phenolic content. Gallic and ellagic acids, which were quantified as the major phenolics of the respective juices, are suggested to be the main contributors to the antioxidant activities. The alpha-glucosidase inhibitory activity of the juices could be derived from myricetin and quercetin (that were previously reported as potent alpha-glucosidase inhibitors) in the hydrolyzed juice extracts. The juice of Syzygium samarangense, which was found to be highest in metal chelating activity (82.28 +/- 0.10%), also was found to have these phenolics.
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