title: The determination of bifunctional compounds. IX. A selective reaction for the determination of guaifenesin in plasma by gas chromatography.
abstract: Guaifenesin after extraction from plasma with an organic solvent can be selectively derivatized with 2,4-dichlorobenzeneboronic acid and determined by gas chromatography with electron-capture detection. The detection limit for guaifenesin was 15 ng ml-1 for a 2.0-ml plasma sample. The mass spectra of the boronate derivatives of guaifenesin and mephenesin, used as internal standard, show good molecular ions with characteristic modes of fragmentation useful for their identification.
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006140:Guaifenesin / Q000097:blood*; D006801:Humans
chemical_list: D006140:Guaifenesin