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Activities of Quercetin-3’-O-β-D-glucoside Isolated from Allium cepa Enos Tangke Arunga,b, Shoko Furutac, Hiroya Ishikawac, Hiroyuki Tanakad, Kuniyoshi Shimizua,*, and Ryuichiro Kondoa a Department of Agro-environmental Sciences, Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan. Fax: 81-92-642-3002. E-mail: shimizu@agr.kyushu-u.ac.jp b Department of Forest Product Technology, Faculty of Forestry, Mulawarman University, Samarinda, 75123, Indonesia c Department of Nutrition and Health Science, Faculty of Human Environmental Science, Fukuoka Women

70% (V/V), and solvent to sample ratio 50:1 mL/g, and under such conditions, the maximum yield of 6.237 g quercetin equivalents /100 g Laoying tea dry weight could be achieved. Three flavonoid compounds, namely quercetin-3-O-β-D-galactoside, quercetin-3-O-β-D-glucoside, and kaempferol-3-O-β-D-glucoside were identified and quantified by HPLC. Compared with conventional water bath extraction, ultrahigh pressure extraction exhibited higher extraction effectiveness in terms of higher extraction yield, higher antioxidant activity with lower temperature and shorter

] Whole plants S. glabra [ 109 ] Whole plants S. hainanensis [ 112 ] 423 Kaempferol 3- O - β -D-glucoside Leaves A. lucida [ 106 ] Whole plants S. hainanensis [ 112 ] 424 Kaempferol 3- O - β -D-galactoside Leaves A. lucida [ 106 ] 425 Kaempferol 3- O - β -D-xyloside Leaves A. lucida [ 106 ] 426 Kaempferol 3- O - a -L-rhamnoside Leaves A. lucida [ 106 ] 427 Kaempferol 3- O -rutinoside Leaves A. lucida [ 106 ] 428 Quercetin 3- O - β -D-glucoside Leaves A. lucida [ 106 ] 429 Quercetin 3- O - β -D-galactoside Leaves A. lucida [ 106 ] 430 Quercetin 3- O - β -D