In the situation of substances with low concentrations in biological content, liquid or fuel chromatography with tandem mass spectrometry techniques have the necessary sensitivity. During the mentioned case, a liquid chromatograph by using a triple quadrupole mass spectrometer operating in several reaction checking (MRM) manner was used for NPS screening. https://5fmdmb220191233.activosblog.com/29913278/the-2-minute-rule-for-5f-mdmb-2201