摘要
利用正相和反相硅胶柱色谱、凝胶柱色谱和反相高效液相等分离和纯化方法,从构树Broussonetia papyrifera茎枝中分离得到11个黄酮类化合物。运用NMR,MS,UV,IR等波谱方法鉴定了它们的结构,分别为构树素A(1),5,7,3',4'-四羟基-3-甲氧基-8-香叶基黄酮(2),8-异戊烯基槲皮素-3-甲醚(3),构树醇D(4),构树黄酮醇B(5),新乌尔醇(6),构树醇E(7),8-(1,1-二甲基丙烯基)-5'-(3-甲基-2-丁烯基)-3',4',5,7-四羟基黄酮醇(8),构树黄酮醇E(9),4,2',4'-三羟基查尔酮(10),紫铆花素(11)。其中化合物1为新的异戊烯基取代的黄酮醇,化合物3,6,10,11为首次从构属植物中分离得到,化合物4和7为首次从构树中分离得到。化合物1~5和7~9具有显著的蛋白酪氨酸磷酸酶1B抑制活性,IC50为(0.83±0.30)~(4.66±0.83)μmol·L-1。
Eleven flavonoids were isolated from the twigs of Broussonetia papyrifera by column chromatography over silica gel,ODS,MCI gel,and Sephadex LH-20,as well as RP-HPLC.Their structures were identified by spectroscopic methods including NMR,MS,UV,and IR as broupapyrin A(1),5,7,3',4'-tetrahydroxy-3-methoxy-8-geranylflavone(2),8-prenylquercetin-3-methyl ether(3),broussonol D(4),broussoflavonol B(5),uralenol(6),broussonol E(7),8-(1,1-dimethylallyl)-5'-(3-methylbut-2-enyl)-3',4',5,7-tetrahydroxyflanvonol(8),broussoflavonol E(9),4,2',4'-trihydroxychalcone(10),and butein(11).Compound 1 is a new isoprenylated flavonol.Compounds 3,6,10,and 11 were obtained from the genus Broussonetia for the first time,and 4 and 7 were firstly discovered in B.papyrifera.Compounds 1-5 and 7-9 showed significant inhibitory effects on PTP1 B with IC50 values ranging from(0.83±0.30) to(4.66±0.83) μmol·L-1.
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