title: Determination of urinary thiamine by high-pressure liquid chromatography utilizing the thiochrome fluorscent method.
abstract: A sensitive, reproducible, and specific method for the determination of urinary thiamine has been established. Unique to the use of high-pressure liquid chromatography (HPLC) to separate the fluorescent thiamine derivative from interfering fluorescent compounds. Urine samples were passed through a Decalso catoin-exchange column, washed with 0.5 M KCl to remove some interfering compounds, and eluted with 3.4 M KCl. The eluted thiamine was converted to the fluorescent derivative, thiochrome, by reaction with alkaline potassium ferricyanide. The reaction mixture was extracted with isobutanol and subjected to HPLC monitored by a fluorescent detector. Within-day and day-to-day coefficients of variation proved to be 2.5% and 1.2% respectively. Recovery of added thiamine (range 0.04 to 2.0 microgram/ml) averaged 99.9 +/- 5.3%. The sensitivity of this method was 0.03 microgram/ml.
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008297:Male; D008832:Microchemistry; D011743:Pyrimidines; D051381:Rats; D013050:Spectrometry, Fluorescence / Q000379:methods; D013831:Thiamine / Q000652:urine* / Q000031:analogs & derivatives; D013844:Thiazoles
chemical_list: D011743:Pyrimidines; D013844:Thiazoles; C005793:thiochrome; D013831:Thiamine