TY - JOUR T1 - Quantitation of amobarbital, butalbital, pentobarbital, phenobarbital, and secobarbital in urine, serum, and plasma using gas chromatography-mass spectrometry (GC-MS). AU - Johnson,Leonard L, AU - Garg,Uttam, PY - 2010/1/16/entrez PY - 2010/1/16/pubmed PY - 2010/4/7/medline SP - 65 EP - 74 JF - Methods in molecular biology (Clifton, N.J.) JO - Methods Mol Biol VL - 603 N2 - Barbiturates are central nervous system depressants with sedative and hypnotic properties. Some barbiturates, with longer half-lives, are used as anticonvulsants. Their mechanism of action includes activation of gamma-aminobutyric acid (GABA) mediated neuronal transmission inhibition. Clinically used barbiturates include amobarbital, butalbital, pentobarbital, phenobarbital, secobarbital, and thiopental. Besides their therapeutic use, barbiturates are commonly abused. Their analysis is useful for both clinical and forensic proposes. Gas chromatography mass spectrometry is a commonly used method for the analysis of barbiturates. In the method described here, barbiturates from serum, plasma, or urine are extracted using an acidic phosphate buffer and methylene chloride. Barbital is used as an internal standard. The organic extract is dried and reconstituted with mixture of trimethylanilinium hydroxide (TMAH) and ethylacetate. The extract is injected into a gas chromatogram mass spectrometer where it undergoes "flash methylation" in the hot injection port. Selective ion monitoring and relative retention times are used for the identification and quantitation of barbiturates. SN - 1940-6029 UR - https://www.unboundmedicine.com/medline/citation/20077060/Quantitation_of_amobarbital_butalbital_pentobarbital_phenobarbital_and_secobarbital_in_urine_serum_and_plasma_using_gas_chromatography_mass_spectrometry__GC_MS__ L2 - https://dx.doi.org/10.1007/978-1-60761-459-3_7 DB - PRIME DP - Unbound Medicine ER -