Seven glycosidic components were isolated from flue-cured tobacco (Nicotiana tabacum L. ) leaves grown in Yuxi,Yunnan Province. Their chemical structures were determined by physical and chemical constants and the data of spectroscopic identifications. They are Scopolin(l) ,Rutin(2) , Kaempferol-3-0-neohesperidoside(3) ,3-oxo-α-ionol-β-D-glucopyranoside(4 ) , 7, 8-dihydro-3-oxo-α-ionol-β-D-glucopyranoside ( 5 ) , Isofraxetin-6-0-β-D-glucopvranoside ( 6 ) and Delphoside(7). Compounds 3,5,6 and 7 were isolated from Nicotinana species for the first time.%从云南烤烟型烟叶中分得7个糖苷类化合物,通过理化常数测定和光谱分析其化学结构分别鉴定为东莨菪甙(Scopolin,1)、槲皮素-3-β-D-芸香糖甙(Rutin,2)、山柰酚-3-O-新橙皮糖苷(Kaempferol-3-O-neohesperidoside,3)、3-氧代-α-紫罗兰醇β-D-吡喃葡萄糖甙(3-oxo-α-ionol-β-D-glucopyranoside,4)、7,8-二氢-3-氧代-α-紫罗兰醇-β-D-吡喃葡萄糖甙(7,8-dihydro-3-oxo-α-ionol-β-D-glucopyranoside,5)、异秦皮定-6-O-β-D-吡喃葡萄糖甙(Isofraxetin-6-O-β-D-glucopyranoside,6)、异香豆素萄糖甙(Delphoside,7).化合物3、5、6和7为首次从烟叶中分离得到.
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