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Letter: In situ chemical ionization in ion trap mass spectrometry - the beneficial influence of isobutane as a reagent gas

机译:信函:离子阱质谱中的原位化学电离-异丁烷作为反应气的有益影响

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We report a comparison of the ionization yields provided by the most common reagents (methane, ammonia, methanol, acetonitrile and isobutane) performing in situ chemical ionization with an ion trap mass spectrometer. Four molecules were chosen in the medical field to illustrate experimental results: alprazolam, diazepam, flunitrazepam and acetaminophen. Under usual operational conditions, relative abundances of protonated ions appreciably depend on the reagents. The greatest abundance of MH+ ions was obtained with isobutane while observed intensities for MH+ ions varied from 73 % for methanol and ammonia to about 23 % for acetonitrile and methane. Results were rationalized comparing energies of formation of the reagent ions and storage efficiency in the trapping field.
机译:我们报告了使用离子阱质谱仪进行原位化学电离的最常见试剂(甲烷,氨,甲醇,乙腈和异丁烷)提供的电离产率的比较。在医学领域选择了四种分子来说明实验结果:阿普唑仑,地西epa,氟尼西epa和对乙酰氨基酚。在通常的操作条件下,质子化离子的相对丰度明显取决于试剂。用异丁烷获得最大的MH +离子丰度,而观察到的MH +离子强度则从甲醇和氨的73%到乙腈和甲烷的约23%不等。通过比较试剂离子的形成能量和在捕集场中的存储效率,使结果合理化。

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