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烷基糖苷平均聚合度和α-,β-吡喃葡糖苷比例影响因素的研究 被引量:7
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作者 金欣 张淑芬 +3 位作者 杨锦宗 唐炳涛 于宁 祝明贵 《现代化工》 CAS CSCD 北大核心 2002年第4期30-33,共4页
以一水葡萄糖、月桂醇为原料 ,对甲苯磺酸为催化剂 ,经直接苷化法合成了月桂基葡糖苷 ,对产品结构进行了表征 ,计算了烷基多苷的平均聚合度、α 吡喃糖苷和 β 吡喃糖苷的比例。考察了反应条件对平均聚合度、α 和 β 吡喃糖苷比例及吡... 以一水葡萄糖、月桂醇为原料 ,对甲苯磺酸为催化剂 ,经直接苷化法合成了月桂基葡糖苷 ,对产品结构进行了表征 ,计算了烷基多苷的平均聚合度、α 吡喃糖苷和 β 吡喃糖苷的比例。考察了反应条件对平均聚合度、α 和 β 吡喃糖苷比例及吡喃糖苷与呋喃糖苷比例的影响。结果表明 :通过改变醇糖摩尔比、反应温度、催化剂用量、反应时间等条件可有效控制平均聚合度、α 和 β 展开更多
关键词 烷基糖苷 平均聚合度 α-吡喃糖苷 β-吡喃葡糖苷 非离子表面活性剂
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New Constituents from the Fresh Stems of Opuntia Dillenii 被引量:2
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作者 QIUYing-kun CHENYing-jie +2 位作者 PEIYu-pin MatsudaHisashi YoshikawaMasayuki 《Journal of Chinese Pharmaceutical Sciences》 CAS 2003年第1期1-5,共5页
Aim To study the chemical composition of Opuntia dillenii Haw. Methods Manykinds of chromatogra-phy methods were used in the isolation procedure, while the structures ofisolated compounds were determined on the aids o... Aim To study the chemical composition of Opuntia dillenii Haw. Methods Manykinds of chromatogra-phy methods were used in the isolation procedure, while the structures ofisolated compounds were determined on the aids of NMR and MS spectral analysis. Result Three newcompounds, together with 14 known compounds, were isolated form the 80% ethanolic extract of itsstems. Conclusion The three new compounds, opuntioside Ⅰ (2), 4-ethoxyl-6-hydroxymethyl-α-pyrone(3) and kaempferol 7-O-β-D-glucopyranosyl (1→4)-β-D-glucopyranoside (4), were characterized. 展开更多
关键词 opuntia dillenii opuntioside 4-ethoxyl-6-hydroxymethyl-α-pyrone kaempferol 7- O-β-D-glucopyranosyl (1→4)-β-D-glucopyranoside
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