title: Paired-ion high-performance liquid chromatographic assay for plasma choline.
abstract: Choline was isolated from deproteinized plasma by cation-exchange chromatography. Isolated choline was directly converted to the 3,5-dinitrobenzoate derivative and was analyzed by paired-ion high-performance liquid chromatography with UV detection at 254 nm. An internal standard, 3-hydroxy-N,N,N-trimethylpropanaminium iodide was used for quantitation of plasma choline. Linearity was achieved from 1--500 nmole/ml with a reproducibility of +/- 6%. Plasma choline concentrations below 1 nmole/ml could not be accurately measured while plasma choline concentrations in the micromole/ml range deviated from linearity.
mesh_terms: D002412:Cations; D002794:Choline / Q000031:analogs & derivatives / Q000097:blood*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002852:Chromatography, Ion Exchange; D004136:Dinitrobenzenes; D006801:Humans
chemical_list: D002412:Cations; D004136:Dinitrobenzenes; C007954:homocholine; D002794:Choline