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Extraction of thiamylal in serum using hydrophilic acetonitrile with subzero-temperature and salting-out methods.

For high-performance liquid chromatography (HPLC) of thiamylal, one of the barbiturates, the drug in serum samples was extracted by two alternative liquid-liquid extraction techniques using hydrophilic acetonitrile as a solvent and subzero-temperature and salting-out methods. Acetonitrile was mixed with the sample, separated by cooling at -20 degrees C or addition of sodium chloride, and injected directly into the HPLC apparatus. In both the methods, thiamylal was extracted effectively in the acetonitrile phase and pH adjustment of the sample was not required. The salting-out extraction method is rapid and would be suitable for quantitation of drugs in many samples. To avoid coextraction of added salt, the subzero-temperature extraction method was applied to identification of thiamylal by gas chromatography/ mass spectrometry and liquid chromatography-tandem mass spectrometry.[1]

References

  1. Extraction of thiamylal in serum using hydrophilic acetonitrile with subzero-temperature and salting-out methods. Yoshida, M., Akane, A., Nishikawa, M., Watabiki, T., Tsuchihashi, H. Anal. Chem. (2004) [Pubmed]
 
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