Characterization of low molecular weight hydrocarbon oligomers by laser desorption/ionization time-of-flight mass spectrometry using a solvent-free sample preparation method.
Characterization of low molecular weight hydrocarbon oligomers by laser desorption/ionization time-of-flight mass spectrometry using a solvent-free sample preparation method.
复制标题
使用无溶剂样品制备方法，通过激光解吸/电离飞行时间质谱法表征低分子量烃低聚物。
DOI：
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发表时间：
2002
影响因子：
2
通讯作者：
W. König
中科院分区：
文献类型：
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作者：
Julia K Pruns;J. Vietzke;M. Strassner;C. Rapp;U. Hintze;W. König
开发了一种使用三氟乙酸银 (AgTFA) 的新型无溶剂样品制备方法，用于通过激光解吸/电离飞行时间质谱 (LDI-TOFMS) 分析低分子量石蜡和微晶蜡。实验表明，通过将 AgTFA 直接分散在液体石蜡中，无需使用额外的溶剂，可以提高光谱质量。该制备混合物直接应用于 MALDI 探针。固体蜡可以在分析前通过熔化进行检查。该方法还提供了足够可重复的光谱，单环烷烃峰和双环烷烃峰之间的峰面积比表明石蜡样品的环烷烃含量的变化。通过分析烷烃标准品来研究解吸/电离过程中观察到的碳氢化合物的脱氢。
A new solvent-free sample preparation method using silver trifluoroacetate (AgTFA) was developed for the analysis of low molecular weight paraffins and microcrystalline waxes by laser desorption/ionization time-of-flight mass spectrometry (LDI-TOFMS). Experiments show that spectral quality can be enhanced by dispersing AgTFA directly in liquid paraffins without the use of additional solvents. This preparation mixture is applied directly to the MALDI probe. Solid waxes could be examined by melting prior to analysis. The method also provides sufficiently reproducible spectra that peak area ratios between mono- and bicyclic alkane peaks indicated variations in the cycloalkane content of paraffin samples. Dehydrogenation of hydrocarbons observed during the desorption/ionization process was studied by analysis of alkane standards.