Hayder Yahya Mansoor Al-Jarsha,
Mowafaq M Ghareeb 
For correspondence:- Mowafaq Ghareeb Email: mowafaq.abd@copharm.uobaghdad.edu.iq Tel:+9647705319534
Accepted: 6 May 2024 Published: 29 May 2024
Citation: Al-Jarsha HY, Ghareeb MM. Validation of UV-visible spectrophotometric method for niclosamide in different media. Trop J Pharm Res 2024; 23(5):871-880 doi: 10.4314/tjpr.v23i5.9
© 2024 The authors.
This is an Open Access article that uses a funding model which does not charge readers or their institutions for access and distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0) and the Budapest Open Access Initiative (http://www.budapestopenaccessinitiative.org/read), which permit unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited..
Purpose: To validate a UV-visible spectrophotometric technique for evaluating niclosamide (NIC) concentration in different media across various values of pH.
Methods: NIC was investigated using a UV-visible spectrophotometer in acidic buffer solution (ABS) of pH 1.2, deionized water (DW), and phosphate buffer solution (PBS), pH 7.4. The characterization of NIC was done with differential scanning calorimeter (DSC), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The UV analysis was validated for accuracy, precision, linearity, and robustness.
Results: The DSC spectra showed a single endothermic peak at 228.43 °C (corresponding to the melting point of NIC), while XRD and FTIR analysis confirmed the identity, crystallinity and purity of NIC. In all media, the measured concentration of NIC was within ± 5 % of the actual value, which confirmed accuracy. The percentage relative standard deviation values were < 1 %, reflecting the precision of the method. The range of concentration measured was between 2 and 24 µg/mL, and all coefficient of determination (R2) values were > 0.99, indicating the linearity of the established analytical method. The limit of detection (LOD) and limit of quantification (LOQ) values were 0.122 and 0.407 µg/mL in ethanol, 0.530 and 1.766 µg/mL in ABS (pH 1.2), 0.224 and 0.747 µg/mL in DW, and 0.798 and 2.662 µg/mL in PBS, pH 7.4. The robustness was confirmed as the measured concentration under slight changes in temperatures and wavelengths were insignificant (p > 0.05).
Conclusion: Based on the results above, the UV-visible spectrophotometric method under investigation was validated to be accurate, precise, linear, and robust in all the different media for the determination of NIC.
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