Adsorptive stripping voltammetry of nicardipine at a HMDE; determination of trace levels nicardipine in blood and urine.
The redox behaviour of nicardipine, a 1,4-dihydropyridine calcium antagonist, has been studied in different media on mercury, glassy carbon, gold and platinum electrodes using various voltammetric techniques. A highly sensitive adsorptive stripping voltammetric method for the determination of nicardipine based on adsorption of the drug onto mercury, followed by differential pulse voltammetric determination of the surface species, is described. All factors (pH, supporting electrolyte, accumulation potential and time, etc.) influencing adsorption as well as voltammetric response are discussed. The application of adsorptive stripping voltammetry at the hanging mercury drop electrode (HMDE) to the determination of trace levels of nicardipine in human urine and blood is illustrated, without an extraction procedure being necessary prior to the voltammetric measurement. A limit of detection of 4.8 ng per ml urine and 34 ng per ml blood is found with a mean recovery of nicardipine in urine and blood of 97%. The mean relative error does not exceed 6.5%.
Obendorf
D
D
Institut für Analytische Chemie und Radiochemie, Universität Innsbruck, Austria.
Stubauer
G
G
D002121:Calcium Channel Blockers / Q000032:analysis*; D004563:Electrochemistry; D006801:Humans; D009529:Nicardipine / Q000032:analysis* / Q000097:blood / Q000652:urine; D010084:Oxidation-Reduction
D002121:Calcium Channel Blockers; D009529:Nicardipine