DETERMINATION OF DIPHENYLPYRALINE HYDROCHLORIDE IN PURE SOLUTIONS AND PHARMACEUTICAL PREPARATIONS USING ION SELECTIVE ELECTRODES UNDER BATCH AND FIA CONDITIONS

作者：Abdel Ghani Nour Tawfik^*; Hussein Salwa Hamed

来源：Analytical Letters, 2010, 43(4): 582-602.

DOI：10.1080/00032710903406854

• Conductimetry
• Diphenylpyraline hydrochloride (Di-HCl)
• Flow injection analysis
• Ion selective electrode
• Phosphotungestic acid
• Potentiometry
• Sodium tetraphenylborate

New diphenylpyraline (Di) ion selective plastic membrane electrodes for both conventional and coated wire types based on the ion associate of Di-HCl with sodium tetraphenylborate (NaTPB) and phosphotungestic acid (PTA) were prepared. The conventional type electrode was fully characterized in terms of membrane composition, plasticizer, filling solution, life span, pH, ionic strength, and temperature. The membranes of optimum compositions were used for the preparation of both graphite and cupper coated wire electrodes. The prepared electrodes were used for the potentiometric determination of the investigated drug in raw material and pharmaceutical preparations under batch and flow injection analysis conditions. The selectivity of the electrodes towards a large number of excipients like inorganic cations, sugars, and amino acids was tested. In addition, the determination of Di-HCl, the solubility product of the ion associate and the formation constant of the precipitation reaction leading to the ion associate formation were carried out using a conductimetric technique based on its ion association with NaTPB and PTA.

• 出版日期2010