Endocyclic double bond isomers and by-products from rebaudioside A and stevioside formed under acid conditions
作者:Wilmer H. Perera、Maite L. Docampo、Frank T. Wiggers、Charles D. Hufford、Frank R. Fronczek、Bharathi Avula、Ikhlas A. Khan、James D. McChesney
DOI:10.1016/j.phytol.2018.04.007
日期:2018.6
The hydrolysis reaction of rebaudioside A and stevioside was studied under mild and strong acidic conditions at different temperatures and times. Exposure of rebaudioside A to vigorous acid conditions yielded three different aglycone cores which were purified by silica gel chromatography: compound 1 (isosteviol), 2 (steviol) and 3 (endocyclic isomer of steviol). Four new glucoside degradation products
研究了莱鲍迪甙A和甜菊糖苷在温和强酸性条件下,不同温度和时间下的水解反应。将莱鲍迪苷A暴露于强酸条件下,产生了三种不同的糖苷配基核心,其通过硅胶色谱法进行了纯化:化合物1(异甜菊醇),2(甜菊醇)和3(甜菊醇的环内异构体)。四个新的糖苷降解产物与ENT -kaur-15烯-19-具有三个已知化合物羧酸骨架一起被从后莱鲍迪甙A和蛇菊苷温和酸水解制得。根据广泛的1D和2D NMR测量和/或MS / MS片段鉴定化合物:化合物4(Endo-甜菊糖苷),化合物5:(内-莱鲍迪苷G 1),化合物6(内-甜菊糖苷)和化合物7(内-鲁布苷),而化合物8-10被鉴定为异-莱鲍迪苷A(内-莱鲍迪苷A)(8 ),异-rebaudioside B(远藤-rebaudioside B)(9)和异-stevioside(远藤-stevioside)(10) 。化合物3和6的晶体结构测定允许通过X射线衍射确认其结构。