Mass spectrometry (MS) has become the central technique that is extensively used for the
analysis of molecular structures of unknown compounds in the gas phase. It manipulates the …

A portable reagent inlet system for a linear quadrupole ion trap (LQIT) mass spectrometer
was designed to diminish the impact of air and water on gas-phase ion–molecule reactions …

Rationale Huahong tablet, a commonly used clinical Chinese patent medicine, shows good
efficacy in treating pelvic inflammation and other gynaecological infectious diseases …

Rationale This study developed a method for the rapid classification and identification of the
chemical composition of Qingyan dropping pills (QDP) to provide the theoretical basis and …

Tandem mass spectrometry based on diagnostic gas-phase ion–molecule reactions
represents a robust method for functional group identification in unknown compounds. To …

Sulfonate esters, a class of potentially mutagenic drug impurities, are strictly regulated in
pharmaceuticals. On the other hand, sulfite esters and sulfones, analogs of sulfonate esters …

Aziridines are commonly used as reagents for the synthesis of drug substances although
they are potentially mutagenic and genotoxic. Therefore, their unambiguous detection is …

The current research is constructed for considering the chemical ionization and dissociation
of perindopril in the positive mode of corona discharge ion mobility spectrometry. Four …