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Khaleda H. Al-Saidi, Nabil S. Nassory and Shahbaz A. Maki Al-Nahrain University, College of Science, Chemistry Department, Al-Jaderia, Baghdad, Iraq. Abstract Amoxicillin trihydrate selective electrodes were prepared based on amoxicillin-phosphotungstate (Amox-PT) as an active sensor with different plasticizers, di-butyl phosphate (DBP), di-butyl phthalate (DBPH), di-octyl phthalate (DOPH), tri-butyl phosphate (TBP) and o-nitro phenyl octyl ether (NPOE) in PVC matrix membranes. The study was carried out to investigate the electrode parameters, effect of pH, selectivity and UV-derivative spectrophotometer technique. Internal filling solution of 10 M + 10 M NaCl was used to fill the electrodes. The best electrode was based on DBP plasticizer which gave a slope 58.7 mV/decade and detection limit of 2 x 10 M displayed good stability and reproducibility. The electrode was used to determine the amoxicillin in oral suspension and capsules. The results were compared with UV-derivative spectrophotometer technique and the recovery for the drugs obtained by second derivative are quite comparable with the recovery obtained by amoxicillin electrodes.

PREPARATION AND STUDY OF AMOXICILLIN SELECTIVE ELECTRODES AND THEIR APPLICATION WITH DERIVATIVE SPECTROPHOTOMETER IN PHARMACEUTICAL DRUGS