Sulfadiazine-potentiometric sensors for flow and batch determinations of sulfadiazine in drugs and biological fluids.
New PVC membrane electrodes for the determination of sulfadiazine (SDZ) are presented. The electrodes are fabricated with conventional and tubular configurations with a graphite-based electrical contact, and no internal reference solution. The selective membranes consist of bis(triphenylphosphoranilidene)ammonium.SDZ (electrode A), tetraoctylammonium bromide (electrode B), or iron(II)-phthalocyanine (FePC) (electrode C) electroactive materials dispersed in a PVC matrix of o-nitrophenyl octyl ether (o-NPOE) plasticizer. The sensors A, B, and C displayed linear responses over the concentration ranges 1.0 x 10(-2) - 1.0 x 10(-5), 1.0 x 10(-2) - 7.5 x 10(-6), and 3.2 x 10(-2) - 7.0 x 10(-6) mol l(-1) (detection limits of 1.09, 2.04 and 0.87 microg ml(-1)) with anionic slopes of -57.3 +/- 0.1, -46.7 +/- 0.5, and -65.1 +/- 0.2 mV decade(-1), respectively. No effect from pH was observed within 4.0 - 5.5, 4.8 - 10, and 4.5 - 8, respectively, and good selectivity was found. The sensors were applied to the analysis of pharmaceuticals and biological fluids in steady state and in flow conditions.
Kamel
Ayman H
AH
REQUIMTE, Instituto Superior de Engenharia do Porto, R. Dr. António Bernardino de Almeida 431,4200-072 Porto, Portugal.
Almeida
Sofia A A
SA
Sales
M Goreti F
MG
Moreira
Felismina T C
FT
D001826:Body Fluids / Q000737:chemistry*; D002675:Child, Preschool; D004566:Electrodes; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007223:Infant; D008567:Membranes, Artificial; D015394:Molecular Structure; D004364:Pharmaceutical Preparations / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry; D011199:Potentiometry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013411:Sulfadiazine / Q000032:analysis*; D013997:Time Factors
D008567:Membranes, Artificial; D004364:Pharmaceutical Preparations; D013411:Sulfadiazine; D011143:Polyvinyl Chloride