30A-3 |
Various extraction solvents conditions and their total polyphenols and flavonoid contents of Korea yuza (citrus junos sieb) |
K. M. YOO1, J. B. Park2, and I. K. Hwang1. (1) Dept. of Food & Nutrition, Seoul National Univ., San 56-1, Shillm-Dong, Kwanak-Ku, Seoul, 151-742, South Korea, (2) Korean Food Research Institute, South Korea Yuza(Citrus Junos Sieb), a unique kind of citrus fruits, is cultivated mainly in Korea and Japan. The total polyphenols and flavonoids contents in the peel and flesh of unripe green yuza and ripe yellow one were analyzed. Extraction yield, total polyphenols and flavonoids in the peel were higher than those in the flesh. Total flavonoids content in unripe green yuza was higher than that in ripe yellow yuza, while total polyphenol content in ripe yellow yuza was higher than that in unripe green yuza. The compositions of flavonoids in yuza were determined by TLC with the several developing solvents. Yuza extract with 70% methanol revealed highest extraction yield was further fractionated stepwisely with cyclohexane, benzene, n-butanol, ethyl acetate, methanol and water. Contents of total solid, polyphenols and flavonoids in each extract were determined. The diethyl acetate extract contained highest polyphenols level, while methanol extract contained highest flavonoids level.
Session 30A, Citrus
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