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Spectrophotometric Determination of Nizatidine and Ranitidine Through Charge Transfer Complex Formation  

Walash, M. (Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University.)
Din, M.-Sharaf-EI (Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University)
Metwalli, M.E.S. (Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University)
RedaShabana, M. (Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University)
Publication Information
Archives of Pharmacal Research / v.27, no.7, 2004 , pp. 720-726 More about this Journal
Abstract
Two Spectrophotometric procedures are presented for the determination of two commonly used H2-receptor antagonists, nizatidine (I) and ranitidine hydrochloride (II). The methods are based mainly on charge transfer complexation reaction of these drugs with either ${\rho}-chloranilic$ acid (${\rho}-CA$) or 2, 3 dichloro-5, 6-dicyanoquinone (DDQ). The produced colored products are quantified spectrophotometrically at 515 and 467 nm in chloranilic acid and 000 methods, respectively. The molar ratios for the reaction products and the optimum assay conditions were studied. The methods determine the cited drugs in concentration ranges of 20-200 and $20-160\;\mu\textrm{g}/mL$ for nizatidine and ranges of 20-240 and $20-140\;\mu\textrm{g}/mL$ for ranitidine with chloranilic acid and DDQ methods, respectively. A more detailed investigation of the complexes formed was made with respect to their composition, association constant, molar absorptivity and free energy change. The proposed procedures were successfully utilized in the determination of the drugs in pharmaceutical preparations. The standard addition method was applied by adding nizatidine and ranitidine to the previously analyzed tablets or capsules. The recovery of each drug was calculated by comparing the concentration obtained from the spiked mixtures with those of the pure drug. The results of analysis of commercial tablets and the recovery study (standard addition method) of the cited drugs suggested that there is no interference from any excipients, which are present in tablets or capsules. Statistical comparison of the results was performed with regard to accuracy and precision using student's t-test and F-ratio at 95% confidence level. There is no significant difference between the reported and proposed methods with regard to accuracy and precision.
Keywords
Ranitidine; Nizatidine; Charge transfer complexation;
Citations & Related Records

Times Cited By Web Of Science : 7  (Related Records In Web of Science)
Times Cited By SCOPUS : 12
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