Capillary zone electrophoretic determination of some drugs against Alzheimer's disease.
A new capillary zone electrophoresis (CZE) method for the determination of tacrine (THA), 7-methoxytacrine (7-MTHA) and their basic metabolites (THAm, 7-MTHAm) in pharmaceutical and biological samples (urine and serum) was developed. Separation of all compounds by CZE was carried out using a 46.6 cm untreated fused-silica capillary applying 20 kV separation voltage using 50 mM phosphate buffer of pH 2.8 for THA and THAm and of pH 7.8 for 7-MTHA and 7-MTHAm as background electrolyte (BGE). Detection was carried out at 240 nm (THA and THAm) and 248 nm (7-MTHA and 7-MTHAm). THA and THAm were separated in less than 4 min while 7-MTHA and 7-MTHAm were separated in less than 7 min. The detection limits (SIN = 3) obtained were 3 ppb for THA and 4 ppb for 7-MTHA in aqueous solutions; 50 ppb for THA and 47 ppb for 7-MTHA for the determination in urine (diluted 1:10); 52 ppb for THA and 56 ppb for 7-MTHA, in deproteinized serum samples. The methods are suitable for therapeutic drug monitoring of the drugs.
Vargas
M G
MG
Department of Analytical Chemistry, Faculty of Sciences, Masaryk University, Brno, Czech Republic.
Havel
J
J
Patocka
J
J
D000544:Alzheimer Disease / Q000097:blood / Q000188:drug therapy* / Q000652:urine; D002138:Calibration; D002800:Cholinesterase Inhibitors / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D018697:Nootropic Agents / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D012680:Sensitivity and Specificity; D013619:Tacrine / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism
D002800:Cholinesterase Inhibitors; D018697:Nootropic Agents; D013619:Tacrine