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A Novel Spectrophotometric Method for Determination of Five 1,4-Dihydropyridine Drugs in Their Tablets and Capsules Using Vanillin Reagent

مؤلف البحث
Mohamed A. El Hamd, Sayed M. Derayea, Osama Hassan Abdelmageed, Hassan F. Askal
مجلة البحث
American Journal of Analytical Chemistry, doi:10.4236/ajac.2013.43020
تصنيف البحث
1
عدد البحث
Vol. 4
سنة البحث
2013
المشارك في البحث
ملخص البحث

A selective and new spectrophotometric method is described for determination of five 1,4-dihydropyridine drugs (1,4- DHP); namely nifedipine (NIF), nicardipine (NIC), nimodipine (NIM), felodipine (FEL) and amlodipine (AML). The method is based on a coupling reaction between the cited drugs and vanillin reagent in acidic condition. Under optimized conditions, the red coloured products were measured at 500 nm for NIF, NIC, NIM and FEL or at 479 nm for AML. Molar absorptivities were ranged from 0.575×104 - 1.065×104 l•mol−1•cm−1, Beer’s law was obeyed at 5-70 μg/mL concentration range and the limit of detection was ranged from 0.150-1.500 μg/mL. The proposed method was successfully extended to pharmaceutical preparations tablets and capsules and comparison by Student’s t-test and variance ratio F-test showed no significant difference.