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Identification of Three New Flavonoids from the Peels of Citrus unshiu

✍ Scribed by Hyun Ji Shin; Joo-Won Nam; Ui Joong Yoon; Ah-Reum Han; Eun-Kyoung Seo

Publisher
John Wiley and Sons
Year
2012
Tongue
German
Weight
174 KB
Volume
95
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Three new flavonoids, 5,6,7,8,3′,4′‐hexamethoxyhomoflavone (1), 5,6,7,8,4′‐pentamethoxyhomoflavone (2) and 3,6,7,8,2′,5′‐hexamethoxyflavone (3) were isolated from the peels of mature fruits of Citrus unshiu Marcow (Rutaceae), together with the three known compounds 6,7,8,4′‐tetramethoxyflavone (=6,7,8‐trimethoxy‐2‐(4‐methoxyphenyl)‐4__H__‐1‐benzopyran‐4‐one), 3,5,7,8,2′,5′‐hexamethoxyflavone (=2‐(2,5‐dimethoxyphenyl)‐3,5,7,8‐tetramethoxy‐4__H__‐1‐benzopyran‐4‐one), and scopoletin (=7‐hydroxy‐6‐methoxy‐2__H__‐1‐benzopyran‐2‐one) of which the former two have never been isolated from natural resources, although they have been reported as synthetic compounds. The structures of 1–3 were elucidated on the basis of spectroscopic evidence, including 1D‐ and 2D‐NMR analysis.

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BACKGROUND: Large amounts of citrus by-products are released from juice-processing plants every year. Most bioactive compounds are found in the peel and inner white pulp. Flavonoids are a widely distributed group of bioactive compounds. The methanolic extract of citrus peel powder has been shown to