Comparison of Headspace GC Sensitivity Depending on Dilution Solvents (Class 3 Solvents)
There are two methods of analyzing residual solvents in pharmaceuticals: a method where the pharmaceutical is dissolved in a solvent and the solution is directly injected to a gas chromatograph (GC), and a method where the solution is enclosed and heated in a vial and the evaporated gas phase is analyzed by GC. The latter method is called the headspace GC. This application note details a study in which Class 3 solvents water, DMSO and DMF were analyzed by headspace GC using DMI as the dilution solvent. Researchers found that there were no components that could achieve a particularly good sensitivity when using DMI, compared to when using other dilution solvents.