Abstract
Most of the pharmaceutical products are formulated as solid dosage form, which may present drug–excipient interactions that lead to changes in the chemical nature of the drug, such as solubility and bioavailability and may compromise its safety and effectiveness. Differential scanning calorimetry (DSC) is a widely used method for the rapid evaluation of the drug-excipient compatibility and the stability of the mixture formed; however, there is no consensus on the preparation methods of the drug–excipient mixtures. The aim of this study was to investigate the influence of the mixing method on the drug–excipient compatibility studies by means of DSC analysis, using tenofovir disoproxil fumarate as a drug model. Statistical analysis revealed significant differences in the heat of fusion of the drug in the mixtures prepared by several mixing methods. Vortex Mixer with a Pop-Off Cup used for 3 min proved to be very satisfactory for these studies. A polymorphic transition was observed in the mixture prepared with the mortar and pestle. Therefore, this method should be avoided since it may induce errors in the interpretation of DSC results. In this way, the mixing method used to prepare a mixture for studies of interactions between the API and the excipients in a pharmaceutical formulation has a great influence on the results and it must be chosen carefully.
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The authors are grateful to CNPq, CAPES, FAPEMIG and PRPq/UFMG for providing financial assistance.
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Supplementary Information (DSC curves of the mixtures between tenofovir disoproxil fumarate and starch submitted to different mixing methods M3, M4, M5 and M6) is available free of charge
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de Lima Gomes, E.C., Ercole de Carvalho, I., Fialho, S.L. et al. Mixing method influence on compatibility and polymorphism studies by DSC and statistical analysis. J Therm Anal Calorim 131, 2123–2128 (2018). https://doi.org/10.1007/s10973-017-6827-x
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DOI: https://doi.org/10.1007/s10973-017-6827-x