天然有机化合物X. 糖苷快原子轰击质谱中的碱金属加合离子应 用技术的研究

在对糖苷的FAB分析技术的研究中发现,如果在样品中同时加入适量的NaCl和LiCl水溶液进样时,其FAB谱中会出现M+Na]^+和M+Li]^+两个强峰,两峰之质量差为16(Na和Li原子量之差值),并且发现其谱图中找不到明显的碎片离子和Na^+及Li^+的加合离子,而只有糖苷分子和Na^+及Li^+的加合离子。所以很容易在FAB谱中识别它们。因而不需联谱解析而仅凭FAB谱就可准确、快速地定出糖苷的分子量。此技术国内外尚未见报道。

Natural organic compound X. The study of alkali metal adduct ions technique of glycosides in fast atom bombardment mass spectrometry

When glycosides were mixed with an appropriate amout of NaCl and LiCl, in the high mass region of their fast atom bombardment mass spectra appeared two strong ion peaks M+Li]^+ and M+Na]^+. This pair of adductions were easily recognized due to the fact that they were very strong (their abundances were higher than that of corresponding M+H]^+ in several tens fold) and their mass difference was unite (16u). From these adductions, the molecular weight of glycosides may be difinitely determined. This technique was particularly suitable for analyzing glycosides with very weak M+H]^+ in their FAB mass spectra. Six such glycosides have been analyzed by this means. This means have not been reported previously.