A stability-indicating reversed-phase high-performance liquid chromatography (RP-HPLC) method has been
developed which can separate and accurately quantitate Mebeverine hydrochloride (MEB) and Chlordiazepoxide (CPZ) in
commercial tablets. The method has shown adequate separation for MEB and CPZ from their degradation products and
main impurities of CPZ whether in pure forms or in commercial tablets. A gradient mobile phase system consisting of (A)
water and (B) methanol was used with Phenomenex® Luna C18 analytical column (250mm x 4.6mm i.d., 5µm ps). Quantitation
was achieved with UV detection at 254 nm, based on peak area. MEB and CPZ were subjected to acidic, basic hydrolysis
and oxidative degradation to apply stress conditions. The linearity of the proposed method was investigated in the
range of 40-130 µg ml-1 (r = 0.9987) for MEB and 8-22 µg ml-1 (r = 0.9991) for CPZ. The limits of detection were 4.77µg
ml-1 and 0.71µg ml-1 for MEB and CPZ, respectively. The limits of quantitation were 14.44 µg ml-1 and 2.14 µg ml-1 for
MEB and CPZ, respectively. Degradation products of MEB, CPZ and impurities of CPZ did not interfere with the detection
of MEB and CPZ. The proposed method can thus be considered as a stability indicating assay.
Keywords: Mebeverine hydrochloride, chlordiazepoxide, stability-indicating, RPHPLC, validation.
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