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KMID : 1007520130220030803
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Food Science and Biotechnology
2013 Volume.22 No. 3 p.803 ~ p.810
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Coumaroyl Quinic Acid Derivatives and Flavonoids from Immature Pear (Pyrus pyrifolia Nakai) Fruit
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Lee Yu-Geon
Cho Jeong-Yong
Kim Chan-Mi
Lee Sang-Hyun
Kim Wol-Soo
Jeon Tae-Il
Park Keun-Hyung
Moon Jae-Hak
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Abstract
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Fourteen compounds were isolated from 60% ethanol extracts of immature pear (Pyrus pyrifolia Nakai cv. Chuhwangbae) fruit using Amberlite XAD-2 column HPLC with guided DPPH radical scavenging assay. Based on MS and NMR analysis, the isolated compounds were identified as 5-O-trans-caffeoyl quinic acid methyl ester (1), malaxinic acid (2), 5-O-trans-p-coumaroyl quinic acid methyl ester (3), 5-O-cis-p-coumaroyl quinic acid methyl ester (4), 5-O-trans-p-coumaroyl quinic acid (5), trans-pcoumaric acid (6), methyl cis-p-coumarate (7), methyl trans-p-coumarate (8), 3,5-O-dicaffeoyl quinic acid (9), (-)-epicatechin (10), (S)-(+)-2-cis-abscisic acid (11), isorhamnetin 3-O-β-D-galacto-pyranoside (12), isorhamnetin- 3-O-β-D-glucopyranoside (13), and isorhamnetin 3-O-α-Lrhamnopyranosyl (1→6)-O-β-D-glucopyranoside (14). Six compounds (1, 2, 6, 9, 10, and 13) were identified previously, but other compounds (3-5, 7, 8, 11, 12, and 14) were isolated for the first time from pear.
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KEYWORD
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Pyrus pyrifolia Nakai, immature pear fruit, coumaric acid derivative, isorhamnetin glycoside, antioxidant activity
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