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Prev Nutr Food Sci. 2012 Jun;17(2):141-51. doi: 10.3746/pnf.2012.17.2.141.

Comparative Studies of Antioxidant Activities and Nutritional Constituents of Persimmon Juice (Diospyros kaki L. cv. Gapjubaekmok).

Author information

1
Department of Monitoring and Analysis, NAKDONG River Basin Environmental Office, Ministry of Environment, Gyeongnam 641-722, Korea.
2
Institute of Agriculture & Life Science, Gyeongsang National University, Gyeongnam 660-701, Korea.
3
Department of Functional Crop, National Institute of Crop Science (NICS), Rural Development Administration, Gyeongnam 627-803, Korea.
4
Cheongak-dong Samsundang Food Co., Gyeongnam 667-886, Korea.
5
Department of Agricultural Produce & Trade, Hadong-Gun Agricultural Technology Center, Gyeongnam 770-701, Korea.
6
Department of Food Science, Gyeongnam National University of Science and Technology, Gyeongnam 660-758, Korea.

Abstract

The objectives of this research were to evaluate antioxidant activities and nutritional components, including phenolic acid, catechin, organic acid, sugar, and amino acid, of persimmon juice from persimmons grown in different regions around Korea. Persimmon (Diospyros kaki) exhibits potent antioxidant effects in DPPH, ABTS, reducing power, and FRAP methods of analysis. The levels of nutritional constituents showed significant differences among all the samples. In particular, tartaric acid, glucose, gallic acid, epicatechin gallate and aspartic acid were observed to be the predominant component for each of their general chemical groups, with total average contents of 1876.51 mg/kg, 62.69 g/kg, 12.73 mg/kg, 208.99 mg/kg, and 31.84 mg/100 g, respectively. Interestingly, persimmons from the Hadong region presented the highest sugar (130.60 g/kg), phenolic acid (42.27 mg/kg), and catechin (527.97 mg/kg) contents in comparison with other regional samples. Moreover, this location exhibited the greatest antioxidant activity with highest total phenolic (298.01 mg GAE/kg) and flavonoid (32.11 mg/kg RE) contents. Our results suggest that strong antioxidant activities of persimmons correlate with high phenolic acid and catechin contents, particularly gallic acid and epicatechin gallate. Additionally, these two compounds may be key factors when considering the useful ingredients of persimmon.

KEYWORDS:

antioxidant activity; catechin; fruit juice; nutritional constituent; persimmon; phenolic acid

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