蜜炙枇杷叶中1个新酚苷类化合物

A new phenolic glycoside from honey-fried Eriobotrya japonica

综合利用硅胶,Sephadex LH-20,RP-18和制备型HPLC等色谱技术,从蜜炙枇杷叶水提物乙酸乙酯萃取部位分离得到12个化合物,并通过MS和NMR等多种波谱技术鉴定其结构分别为japonicanoside A(1)、nerolidol-3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside(2)、nerolidol-3-O-α-L-rhamnopyranosyl-(l→4)-α-L-rhamnopyranosyl-(1→2)-[α-L-(4-trans-feruloyl)-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside(3)、儿茶素[(+)-catechin,4]、表儿茶素[(-)-epicatechin,5]、山柰酚-3-O-α-L-鼠李糖苷(kaempferol-3-O-α-L-rhamnopyranoside,6)、槲皮素-3-O-α-L-鼠李糖苷(quercitrin,7)、槲皮素-3-O-β-D-半乳糖苷(quercetin-3-O-β-D-galactopyranoside,8)、槲皮素-3-O-β-D-葡萄糖苷(quercetin-3-O-β-glucopyranoside,9)、香草醛(vanillin,10)、原儿茶醛(protocatechuic aldehyde,11)、麦芽酚(maltol,12)。其中,化合物1为1个新的酚苷类化合物。

A total of twelve compounds were isolated from the ethyl acetate of the water extract of honey-fried Eriobotrya japonica through column chromatography over silica gel,Sephadex LH-20,RP-18,and preparative HPLC.Their structures were established by MS,1 D NMR and 2 D NMR data as japonicanoside A(1),nerolidol-3-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside(2),nerolidol-3-O-α-L-rhamnopyranosyl-(l→4)-α-L-rhamnopyranosyl-(1→2)-[α-L-(4-trans-feruloyl)-rhamnopyranosyl-(1→6)]-β-D-glucopyranoside(3),(+)-catechin(4),(-)-epicatechin(5),kaempferol 3-O-α-L-rhamnopyranoside(6),quercitrin(7),quercetin-3-O-β-D-galactopyranoside(8),quercetin-3-O-β-glucopyranoside(9),vanillin(10),protocatechuic aldehyde(11),and maltol(12).Among them,1 is a new phenolic glycoside.