In the case of substances with minimal concentrations in biological material, liquid or fuel chromatography with tandem mass spectrometry approaches have the necessary sensitivity. From the discussed case, a liquid chromatograph which has a triple quadrupole mass spectrometer running in multiple response monitoring (MRM) mode was used for NPS screening. https://mariokdujx.mpeblog.com/54792627/how-much-you-need-to-expect-you-ll-pay-for-a-good-5f-mdmb-2201