Differential Pulse Voltammetric and Conductimetric Determination ofDiphenylpyraline HCl in Raw Material and Pharmaceutical Preparation

N. Abdel-Ghani, S. Hussein
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引用次数: 1

Abstract

Diphenylpyraline hydrochloride (Di-HCl) has been determined in raw material and its pharmaceutical prepara- tion Eskornade capsule (5mg/capsule) using differential pulse voltammetry (DPV) and conductimetric determination. It was found that Di-HCl gives a characteristic cyclic voltammetric (CV) and differential pulse voltammetric (DPV) peak in acetonitrile using platinum and glassy carbon sensors as working electrodes. The peak current (Ip) of the DPV peak in- creases linearly within the concentration range 4.5 x 10 -4 -1x10 -2 mol/L of the investigated drug. The concentration of Di- HCl in raw drug material and in its pharmaceutical preparations was determined using standard addition method, Randles- Sevcik equation and indirectly via its complexation with sodium tetra phenylborate (NaTPB), the obtained average recov- eries were 101.44 and 100.49 with standard deviation (SD) 0.45 and 0.38 (n = 4) for platinum and glassy carbon elec- trodes respectively. The effect of scan rate, sample concentration and supporting electrolyte on the peak current (Ip) and peak potential (Ep) was investigated. In addition a simple and sensitive conductimetric method was used for determination of Di-HCl based on its ion associa- tion with sodium tetraphenylborate (NaTPB). The effect of solvent, reagent concentration, temperature and molar ratio was studied. The obtained average recovery was 101.44 with SD 0.45 (n = 4).
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差动脉冲伏安法和电导法测定原料和制剂中盐酸二苯吡啶
采用差分脉冲伏安法(DPV)和电导法测定了盐酸二苯吡啶(Di-HCl)在原料药埃斯克纳德胶囊(5mg/胶囊)中的含量。用铂和玻碳传感器作为工作电极,发现双盐酸在乙腈中具有典型的循环伏安(CV)和差分脉冲伏安(DPV)峰。在药物浓度为4.5 × 10 -4 -1 × 10 -2 mol/L范围内,DPV峰的峰电流(Ip)呈线性增加。采用标准加成法、Randles- Sevcik方程和与四苯硼酸钠(NaTPB)间接络合法测定原料药及其制剂中二盐酸的浓度,得到铂电极和玻碳电极的平均回收率分别为101.44和100.49,标准差(SD)分别为0.45和0.38 (n = 4)。考察了扫描速率、样品浓度和负载电解质对峰值电流(Ip)和峰值电位(Ep)的影响。另外,利用四苯基硼酸钠(NaTPB)的离子缔合作用,建立了一种简便、灵敏的双盐酸测定方法。考察了溶剂、试剂浓度、温度和摩尔比对反应的影响。平均回收率为101.44,SD为0.45 (n = 4)。
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