Development and applications of spectrophotometric methods for quantitative determination of caroverine in pharmaceutical pure and tablet formulations

Asad Raza, Tariq Mahmood Ansari
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引用次数: 3

Abstract

This paper describes two simple and novel analytical methods by using spectrophotometric technique for the determination of caroverine a spasmolytic drug in pharmaceutical formulations. The first (A) is a direct method in which analysis of the pure drug was carried out at its λmax 304 nm in ethanol solvent. The method was linear from 0.5 to 18 μg/ml with correlation coefficient of 0.999 and molar absorptivity of 5.55 × 104 L mole−1 cm−1. Limit of detection and limit of quantification were 0.44 and 1.47 μg/ml. While the second method (B) is based on the charge transfer reaction between caroverine as n-electron donor and 7,7,8,8-tetracyanoquinodimethane (TCNQ) as pi-acceptor resulting in highly colored stable complex, which showed maximum absorption band at wavelength of 525 nm. The thermodynamic parameters were calculated as association constant KCT of 7.53 × 104 mol−1 and Gibbs free energy ΔG° of −6.72 kJ mol−1. Different variables affecting the charge transfer reaction were carefully studied and optimized. At the optimum reaction conditions, Beer’s law was obeyed in a concentration range of 1–35 μg ml−1 with molar absorptivity of 1.17 × 104 L mole−1 cm−1 and correlation coefficient of 0.9999. The proposed methods were validated according to ICH guidelines.

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分光光度法定量测定药物纯制剂和片剂中胡萝卜碱的研究与应用
本文介绍了两种简便、新颖的分光光度法测定制剂中解痉药卡罗弗碱的方法。第一种(A)是直接法,纯药物在乙醇溶剂中在λmax 304 nm处进行分析。该方法在0.5 ~ 18 μg/ml范围内呈线性关系,相关系数为0.999,摩尔吸光度为5.55 × 104 L mol−1 cm−1。检测限和定量限分别为0.44和1.47 μg/ml。而第二种方法(B)是基于胡萝卜碱作为n电子供体与7,7,8,8-四氰喹诺二甲烷(TCNQ)作为pi受体之间的电荷转移反应,得到高度着色的稳定配合物,该配合物在波长525 nm处显示出最大吸收带。热力学参数计算为缔合常数KCT为7.53 × 104 mol−1,吉布斯自由能ΔG°为- 6.72 kJ mol−1。对影响电荷转移反应的各种因素进行了仔细的研究和优化。在最佳反应条件下,溶液浓度在1 ~ 35 μ ml−1范围内符合比尔定律,摩尔吸光度为1.17 × 104 L mol−1 cm−1,相关系数为0.9999。根据ICH指南对建议的方法进行了验证。
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