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        Characterization of quercetin and its glycoside derivatives in Malus germplasm

        Lei Zhang,Qipeng Xu,Yaohua You,Weifeng Chen,Zhengcao Xiao,Pengmin Li,Fengwang Ma 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.6

        Quercetin and its glycoside derivatives were identifi ed and quantifi ed using high-performance liquid chromatograph (HPLC)and liquid chromatograph/mass spectrometer/mass spectrometer (LC/MS/MS) in the leaves, flowers, and fruits of 22 Malusgenotypes. In all genotypes, small amounts of quercetin aglycone were present, with water-soluble glycoside forms were themost abundant in diff erent Malus plant tissues, including quercetin-3-galactoside, quercetin-3-rutinoside, quercetin-3-glucoside,quercetin-3-xyloside, quercetin-3-arabinoside, and quercetin-3-rhamnoside. Among these six quercetin glycosides,quercetin-3-galactoside was the common form in Malus plants, except in the leaves and flowers of M. ceracifolia and M. magdeburgensis , and in the fruits of M. micromalus ‘Haihong Fruit’, where there was a higher concentration of quercetin-3-glucoside. Among the diff erent tissues tested, leaves contained the highest concentration of quercetin and its glycosides,while fruits contained the lowest concentrations of these compounds. Among the genotypes we analyzed, no specifi c genotypeconsistently contained the highest concentration of quercetin and its glycoside derivatives. M. domestica ‘Honeycrisp’had the highest total compound concentration (approximately 1600 mg kg −1 ), whereas M. hupehensis contained the lowestin its fruits. In contrast, the concentration of total quercetin and its glycosides was more than 5000 mg kg −1 in the leaves ofeight genotypes and greater than 2500 mg kg −1 in the flowers of seven species. In general, the concentration of quercetinand its glycoside derivatives depended on the species and tissue type. These results may provide useful information for theevaluation and selection of edible Malus fruits and the materials for quercetin glycoside extraction.

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