title: Determination of thiamin diphosphate in whole blood samples by high-performance liquid chromatography--a method suitable for pediatric diagnostics.
abstract: An improved and easy to use method for the determination of thiamin diphosphate (TDP) in 100 microl of whole blood was developed. The small sample volume makes it possible to assess the nutritional status of vitamin B(1) in infants and even in preterm infants. Sample preparation comprises the extraction of TDP from whole blood by hemolysis, protein precipitation with trichloroacetic acid, and subsequent centrifugation. Potassium ferricyanide is used for pre-column derivatization of TDP to its fluorescent thiochrome derivative. Chromatographic separation was carried out using a reversed-phase column and an isocratic elution which consisted of a phosphate buffer and acetonitrile. TDP was detected fluorimetrically and quantified by external standardization. Method validation showed a high precision, almost complete recovery, and a high sensitivity. The lower limit of detection and the lower limit of quantification were 0.2 ng/ml and 4 ng/ml, respectively. Linearity was demonstrated over the expected concentration range of 4-400 ng/ml. In conclusion, we present a convenient HPLC method for the determination of TDP which is precise, sensitive and suitable for pediatric diagnostics.
authors.affiliation: Department of Therapeutic Drug Monitoring, Institute of Pharmacology, University of Cologne, Gleuelerstrasse 24, D-50931 Cologne, Germany.
authors.forename: Robert Walter
authors.initials: RW
authors.lastname: Körner
authors.forename: Anne
authors.initials: A
authors.lastname: Vierzig
authors.forename: Bernhard
authors.initials: B
authors.lastname: Roth
authors.forename: Carsten
authors.initials: C
authors.lastname: Müller
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013835:Thiamine Pyrophosphate / Q000097:blood*; D014803:Vitamin B Complex / Q000097:blood*; D055815:Young Adult
chemical_list: D014803:Vitamin B Complex; D013835:Thiamine Pyrophosphate