Thiazolidine Peracetates: Carbohydrate Derivatives that Readily Assign <i>cis-</i>,<i>trans</i>-2,3-Monosaccharides by Gas Chromatography–Mass Spectrometry Analysis
作者:Neil. P. J. Price、Trina M. Hartman、Karl E. Vermillion
DOI:10.1021/acs.analchem.8b00976
日期:2018.7.3
nonpolar thiazolidines peracetate (TPA) derivatives are analyzed by gas chromatography and electron impact mass spectrometry (GC/EI-MS), each aldose giving rise to two TPA geometric isomers. The quantitative ratio of these diastereomers is dependent upon whether the parent monosaccharide is cis-2,3-(Rib, Lyx, Man, All, Gul, and Tal), or trans-2,3-aldose (Xyl, Ara, Glc, Gal, Ido, and Alt). TPAs generate observed
描述了一组新颖的碳水化合物衍生物,其以低纳摩尔浓度唯一地分配了顺式/反式-2,3-醛糖立体异构体。来自多糖或寡糖水解的醛糖戊糖,醛糖己糖或组分醛糖与吡啶中的半胱胺反应,得到定量形成的噻唑烷,其随后在一锅法反应中被过乙酰化。通过气相色谱和电子冲击质谱(GC / EI-MS)分析非极性噻唑烷过乙酸(TPA)衍生物,每种醛糖产生两个TPA几何异构体。这些非对映异构体的定量比率取决于母体单糖是顺式-2,3-(Rib,Lyx,Man,All,Gul和Tal)还是反式-2,3-醛糖(Xyl,Ara,Glc,Gal,Ido和Alt)。TPA产生观察到的EI-MS碎片离子,其特征是母糖的C1-C2和C3-C4键断裂。这已被用于估计微生物细胞壁碳水化合物的代谢标记的程度,尤其是进入定义的异头碳以及醛缩酶/酮醇酶催化的重排过程中。