Flavonol Glycosides in Currant Leaves and Variation with Growth Season, Growth Location, and Leaf Position

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• 作者：Wei Yang ; Aino-Liisa Alanne ; Pengzhan Liu ; Heikki Kallio ; Baoru Yang
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：63
• 期：42
• 页码：9269-9276
• 全文大小：550K
• ISSN：1520-5118

文摘

Flavonol glycosides (FG) were analyzed in the leaves of six currant cultivars (Ribes spp.) with HPLC-DAD, HPLC-MS/MS, and NMR. The average amounts of the 12 major, identified FG constituted 86鈥?3% (9.6鈥?4.1 mg/g DW) of the total of 27 FG found. Quercetin and kaempferol were the major aglycones with trace amounts of myricetin. Quercetin-3-O-(2,6-伪-dirhamnopyranosyl-尾-glucopyranoside), quercetin-3-O-(2-尾-xylopyranosyl-6-伪-rhamnopyranosyl-尾-glucopyranoside), and kaempferol-3-O-(3,6-伪-dirhamnopyranosyl-尾-glucopyranoside) were identified for the first time in currant leaves and existed in a white currant cultivar 鈥榃hite Dutch鈥?only. Kaempferol-3-O-尾-(6鈥?malonyl)glucopyranoside was also a new compound existing in abundance in five cultivars but not in the white one. The results show the primary importance of the genetic background of the cultivars. The content of malonylated FG of special importance in cardiovascular health decreased regularly during summer. Time of collection and leaf position were more prominent factors affecting the composition than were the year of harvest or the growth latitude. Randomly collected leaves differed in their FG profiles from those collected from the middle position of new branches.