In the situation of substances with lower concentrations in biological product, liquid or gas chromatography with tandem mass spectrometry approaches have the required sensitivity. In the reviewed case, a liquid chromatograph which has a triple quadrupole mass spectrometer working in various reaction monitoring (MRM) manner was used for NPS screening. https://5fmdmb220135678.imblogs.net/80402109/examine-this-report-on-5f-mdmb-2201