Biomedical subjects

L A Doshier

Publications and source records attributed to L A Doshier.

2 recordsLinked to original sources

PubMed1984

Improved recovery and stability of ethanol in automated headspace analysis.

Solutions are reported here for two problems in automated headspace gas chromatographic analysis for ethanol. The first is the catalytic oxidation of ethanol by oxyhemoglobin, a process that is limited only by the amount of oxygen in the sealed vessel. This reaction is prevented by the addition of sodium dithionite. The other problem, the lack of a suitable salting-out agent, led to the selection of ammonium sulfate, which improved recovery of ethanol as well as enhancing method precision. A procedure incorporating these improvements is described.

Chromatography, Gas↗

PubMedDate not supplied

A convenient thin-layer chromatographic screening method for acetaminophen in serum.

A thin-layer chromatographic screening procedure for acetaminophen in serum was developed that meets the clinical need to identify candidates for antidotal therapy within the critical first 24 hr after ingestion. The key feature of this approach is the use of a detection reagent containing Fe(III) and 2,4,6-tris-(2'-pyridyl)-s-triazine (TPTZ). Acetaminophen on the plate reduces the Fe(III) to Fe(II), which then forms an intensely blue-colored complex with the TPTZ. Concentrations as low as 3 to 4 mg/L can be detected and the procedure is free of interference from 38 other common drugs and metabolites.

Acetaminophen↗