Partial synthesis of ganglioside and lysoganglioside lipoforms as internal standards for MS quantification
作者:Martin Gantner、Günter Schwarzmann、Konrad Sandhoff、Thomas Kolter
DOI:10.1194/jlr.d054734
日期:2014.12
Within recent years, ganglioside patterns have been increasingly analyzed by MS. However, internal standards for calibration are only available for gangliosides GM1, GM2, and GM3. For this reason, we prepared homologous internal standards bearing nonnatural fatty acids of the major mammalian brain gangliosides GM1, GD1a, GD1b, GT1b, and GQ1b, and of the tumor-associated gangliosides GM2 and GD2. The fatty
在最近几年,神经节苷脂模式已被MS越来越多地分析。但是,用于校准的内部标准仅适用于神经节苷脂GM1,GM2和GM3。因此,我们准备了带有内源性标准物的同源内标,这些内标物包含主要哺乳动物脑神经节苷脂GM1,GD1a,GD1b,GT1b和GQ1b以及与肿瘤相关的神经节苷脂GM2和GD2的非天然脂肪酸。在对牛脑神经节苷脂进行选择性化学或酶促脱酰作用后,将脂肪酸部分掺入。对于鞘氨醇碱基的修饰,我们开发了一种基于烯烃交叉复分解的新合成方法。该方法用于制备溶血GM1和溶血GM2标准品。用四个步骤从d20:1/18:0-GM1合成d17:1-lyso-GM1的方法总收率为8.7%。