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• W2080550858 abstract "Three simple, accurate and sensitive colorimetric methods (A, B and C) for the determination of ranitidine HCl (RHCl) in bulk sample, in dosage forms and in the presence of its oxidative degradates are described. The first method A is based on the oxidation of the drug by N-bromosuccinimide (NBS) and determination of the unreacted NBS by measurement of the decrease in absorbance of amaranth dye (AM) at a suitable λmax=520 nm. The methods B and C involve the addition of excess Ce4+ and determination of the unreacted oxidant by decrease the red color of chromotrope 2R (C2R) at a suitable λmax=528 nm for method B or decrease the orange pink color of rhodamine 6G (Rh6G) at a suitable λmax=526 nm for method C. Regression analysis of Beer–Lambert plots showed good correlation in the concentration ranges 0.2–3.6, 0.1–2.8 and 0.1–2.6 μg ml−1 for methods A, B and C, respectively. The apparent molar absorptivity. Sandell sensitivity, detection and quantitation limits were calculated. For more accurate results, Ringbom optimum concentration ranges were 0.3–3.4, 0.2–2.6 and 0.2–2.4 μg ml−1 for methods A, B and C, respectively. Analyzing pure and dosage forms containing RHCl tested the validity of the proposed methods. The relative standard deviations were ≤1.38 with recoveries 98.9–101.0%." @default.
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• W2080550858 date "2003-03-01" @default.
• W2080550858 modified "2023-10-16" @default.
• W2080550858 title "Utility of oxidation–reduction reaction for the determination of ranitidine hydrochloride in pure form, in dosage forms and in the presence of its oxidative degradates" @default.
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• W2080550858 doi "https://doi.org/10.1016/s1386-1425(02)00226-3" @default.
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