Spectrophotometric procedure for indirect determination of ranitidine in pharmaceutical formulation using fluorescein sodium
作者:Zenovia Moldovan、Hassan Y. Aboul-Enein
DOI:10.1007/s13738-012-0147-7
日期:2012.12
A simple and sensitive spectrophotometric method for the determination of ranitidine hydrochloride (R·HCl) in pharmaceutical formulation is proposed. The procedure is based on the oxidation of R·HCl by bromine, generated in situ by the action of bromate–bromide mixture in acid medium, followed by estimation of surplus oxidant by its reaction with fluorescein sodium salt (FL). The decrease in concentration of FL is estimated by measuring its absorbance at λ max = 436 nm. All variables affecting the reaction conditions, such as concentration of NaBrO3, HCl, NaBr and FL, and reaction time were carefully studied and optimized. The analytical curve was linear in the R·HCl concentration range from 0.3 to 8 μg mL−1 with a detection limit of 0.13 μg mL−1. The reliability of the proposed spectrophotometric method was established by parallel determination of pure and dosage forms containing R·HCl, by the reference method and by recovery studies.
本研究提出了一种简单灵敏的分光光度法,用于测定药物制剂中的盐酸雷尼替丁(R-HCl)。该方法基于溴在酸性介质中作用生成的溴混合物对 R-HCl 的氧化作用,然后通过其与荧光素钠(FL)的反应来估算剩余氧化剂。通过测量荧光素钠在 λ max = 436 nm 处的吸光度,可以估算出荧光素钠浓度的下降。所有影响反应条件的变量,如 NaBrO3、HCl、NaBr 和 FL 的浓度以及反应时间,都经过了仔细研究和优化。分析曲线在 R-HCl 浓度范围 0.3 至 8μg mL-1 内线性关系良好,检出限为 0.13μg mL-1。通过平行测定纯品和含 R-HCl 的剂型、参考方法和回收率研究,确定了所建议的分光光度法的可靠性。