Quantification of pralidoxime methylsulfate (Contrathion) in human urine by capillary zone electrophoresis.
Pralidoxime methylsulfate (Contrathion) is widely used to treat organophosphate poisoning. For the first time, we developed a specific assay for urinary pralidoxime using capillary zone electrophoresis (CZE) in the following conditions: fused-silica capillary (length: 47 cm, internal diameter: 75 microm), electrolyte solution: 25 mM sodium borate (pH 9.1), voltage: 15 kV, temperature: 25 degrees C, injection time: 1 or 2s, on-line UV detection: 280 nm. Sample preparation did not require a deproteinization step (1:5 dilution in water). The method was linear between 0.125 and 2 mg mL-1 of pralidoxime (quantification limit: 0.10 mg mL-1). Coefficients of variation for intra- and inter-assay precision were below 10% for all three control levels (0.15-1.15 mg mL-1). This assay was successfully applied to urine specimens from organophosphate poisoned patients treated by Contrathion (n=10). This CZE method allows the measure of pralidoxime in urine within 15 min with excellent precision, selectivity, and sensitivity. It is simple (no pretreatment) and convenient, thus suitable for the monitoring of Contrathion therapy in organophosphate poisoned patients.
Houzé
Pascal
P
Département De Pharamcologie, Laboratoire De Biochimie A, Hôpital Saint Louis (AP-HP), 1 Avenue Claude Vellefaux, 75010 Paris, France. pascal.houze@sls.ap-hop-paris.fr
Thabet
Hafedh
H
Delfour
Alexandre
A
Larrouy
Lucile
L
Le Bricon
Thierry
T
Baud
Frédéric J
FJ
D000931:Antidotes / Q000627:therapeutic use; D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D062025:Organophosphate Poisoning; D011041:Poisoning / Q000188:drug therapy; D011220:Pralidoxime Compounds / Q000627:therapeutic use / Q000652:urine*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D000931:Antidotes; D011220:Pralidoxime Compounds; C028797:pralidoxime