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我们曾阐明了糖苷单一化合物分子量的简明、快速确定方法,根据糖苷化合物中引入碱金属离子的FAB正离子质谱图中,仅出现样品分子和碱金属离子的加合离子峰而难于找到碎片的加合离子峰,现在我们在糖苷混合物中,同时引入两种碱金属离子Na~+和Li~+(两元素原子量之差为16),由此得到的糖苷混合物的FAB正离子谱中,就出现两个一组的多组强峰,且每组的两峰之质量差为16,每组中低质量峰为[M+Li]~+峰,高质量峰为[M+Na]~+峰,根据两峰已标出的质量数便可轻易地定出各成分的分子量来.谱图中出现的强峰组数就是糖苷混合物的成分数.
We have elucidated a simple and rapid method for determining the molecular weight of a single glycoside compound. According to the FAB positive ion mass spectrum of the alkali metal ion introduced into the glycoside compound, only additive ion peaks of the sample molecule and the alkali metal ion appear and it is difficult to find the fragment Now we in the glycoside mixture, while the introduction of two kinds of alkali metal ions Na ~ + and Li ~ + (the difference between the atomic weight of two elements is 16), the resulting glycoside mixture FAB positive ion spectrum, there Two sets of groups of strong peaks, and the difference between the two peaks of each group is 16, the low mass peak in each group is [M + Li] ~ + peak and the high mass peak is [M + Na] ~ + peak, The molecular weight of each component can be easily determined from the masses indicated by the two peaks The number of strong peaks appearing in the spectrum is the composition of the glycoside mixture.