alexa Abstract | Stability-indicating simultaneous HPTLC method for olanzapine and fluoxetine in combined tablet dosage form

Indian Journal of Pharmaceutical Sciences
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Abstract

A rapid, selective and stability-indicating high performance thin layer chromatographic method was developed and validated for the simultaneous estimation of olanzapine and fluoxetine in combined tablet dosage form. Olanzapine and fluoxetine were chromatographed on silica gel 60 F 254 TLC plate using methanol:toluene (4:2 v/v) as the mobile phase and spectrodensitometric scanning-integration was performed at a wavelength of 233 nm using a Camag TLC Scanner III. This system was found to give compact spots for both olanzapine (R f value of 0.63±0.01) and fluoxetine (R f value of 0.31±0.01). The polynomial regression data for the calibration plots showed good linear relationship with r 2 =0.9995 in the concentration range of 100-800 ng/spot for olanzapine and 1000-8000 ng/spot for fluoxetine with r 2 =0.9991. The method was validated in terms of linearity, accuracy, precision, recovery and specificity. The limit of detection and the limit of quantification for the olanzapine were found to be 30 and 100 ng/spot, respectively and for fluoxetine 300 and 1000 ng/spot, respectively. Olanzapine and fluoxetine were degraded under acidic, basic and oxidation degradation conditions which showed all the peaks of degraded product were well resolved from the active pharmaceutical ingredient. Both drugs were not further degraded after thermal and photochemical degradation. The method was found to be reproducible and selective for the simultaneous estimation of olanzapine and fluoxetine. As the method could effectively separate the drugs from their degradation products, it can be employed as a stability-indicating method.

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Author(s): CR Shah BN Suhagia NJ Shah DR Patel NM Patel

Keywords

Stability indicating method, forced degradation, olanzapine, fluoxetine, HPTLC, simultaneous estimation

 
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