In-Source Reactivity Mass Spectrometry Applications

This technical report presents the application of in-source reactivity mass spectrometry (ISR-MS) utilizing a dual electrospray ionization source in the time-of-flight mass spectrometer LCMS-9050. It outlines the innovative use of ISR-MS for the direct characterization of reactive species and real-time monitoring of chemical reactions. The report details three case studies: the formation of cyclic acetals through the acetalization of benzaldehyde, the investigation of a chelated metal ion oxidation state with hydrogen peroxide, and the supercharging of single-stranded oligonucleotides using meta-nitrobenzyl alcohol. Each case study highlights the analytical capabilities of ISR-MS, including the efficient merging of reagents in microdroplets and the potential for enhanced reaction studies. The report concludes with insights on the implications of these findings for chemical analysis and the future applications of high-resolution mass spectrometry in various fields.