Development of a novel imidazolium-based aromatic quaternary ammonium tag: Synthesis and application to the efficient analysis of cysteinyl-peptides by mass spectrometry
Chemical derivatization is a very promising technique for improving analysis of peptides by massspectrometry (MS). In this study, a novel kind of imidazolium‐based aromaticquaternaryammoniumtag, 1‐[3‐[(2‐iodo‐1‐oxoethyl)amino]propyl]‐3‐butylimidazolium bromide (IPBI), designed with strong gas‐phase basicity and a permanent positive charge, was firstly synthesized and further used for derivatization