PHENMETRAZINE (cas 134-49-6) or ephedrine? - Fooled by library search

Add time:09/29/2019    Source:infona.pl

Chemical and/or thermal conversion of analytes in a sample and/or GC injector can mislead the identification of analytes in a toxicological screening. In addition, library search can even more complicate the identification. The risk for false positive identification of PHENMETRAZINE (cas 134-49-6) in an ephedrine-containing sample analysed by GC-MS is described. Ephedrine reacted with formaldehyde contamination in solvents to a compound with a similar mass spectrum as phenmetrazine. High injection temperatures influenced the formation speed.

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