Publicação
Characterization of olanzapine and polymer orodispersible films
| Resumo: | The use of orodispersible films has gained increasing relevance among solid pharmaceutical forms. They consist of a thin and flexible polymeric film, formulated to rapidly disintegrate in the oral cavity. Being a solid dispersion, the solid characterization of its components is of upmost importance, as it dictates the physical stability and safety of the product. The aim of this work was to characterize the drug-polymer compatibility and the solid state of a poorly water-soluble drug (olanzapine) in a polymeric orodispersible matrix, as a primary stage of product development. Methocel® (HPMC) and Soluplus® were chosen as matrix-former polymers, based on their wide-usage in previous works. Olanzapine orodipersible films were obtained through solvent-casting technique, using methanol as solvent and a proportion of drug-polymer of 1:1 (m/m %). Spectroscopic studies (Raman, FTIR, CARS, TimeGated® Raman) and thermodynamic studies (DSC) were performed to characterize olanzapine’s solid state within the orodispersible matrix. Polarized light microscopy showed refringence, thus, revealing the presence of crystals in the both Olz-HPMC and Olz-Soluplus films. Comparing to the assignment made in previous works and to the spectra obtained in this work, spectroscopic data showed peaks that did not correlate neither to form 1 nor to form 2. Furthermore, peaks were found to be shifted towards higher wavenumbers, namely peaks assigned to NH deformations. This suggests that an interaction between the drug and the polymer could be occurring. DSC data supports this hypothesis, as olanzapine’s melting point in both drug-polymer films and physical-mixtures revealed a Tonset severely lower than form 1 melting point. This work suggests that there appears to be an interaction between drug and polymers, which is proposed to be occurring through H bonding. Nonetheless, this interaction could be favourable as it could be interesting to stabilize small dimension crystals or even amorphous form of olanzapine. |
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| Autores principais: | Neves, Ana Maria Gaspar Ventim |
| Assunto: | Orodispersable films Olanzapine Polymorphism Interaction Mestrado Integrado - 2017 |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | The use of orodispersible films has gained increasing relevance among solid pharmaceutical forms. They consist of a thin and flexible polymeric film, formulated to rapidly disintegrate in the oral cavity. Being a solid dispersion, the solid characterization of its components is of upmost importance, as it dictates the physical stability and safety of the product. The aim of this work was to characterize the drug-polymer compatibility and the solid state of a poorly water-soluble drug (olanzapine) in a polymeric orodispersible matrix, as a primary stage of product development. Methocel® (HPMC) and Soluplus® were chosen as matrix-former polymers, based on their wide-usage in previous works. Olanzapine orodipersible films were obtained through solvent-casting technique, using methanol as solvent and a proportion of drug-polymer of 1:1 (m/m %). Spectroscopic studies (Raman, FTIR, CARS, TimeGated® Raman) and thermodynamic studies (DSC) were performed to characterize olanzapine’s solid state within the orodispersible matrix. Polarized light microscopy showed refringence, thus, revealing the presence of crystals in the both Olz-HPMC and Olz-Soluplus films. Comparing to the assignment made in previous works and to the spectra obtained in this work, spectroscopic data showed peaks that did not correlate neither to form 1 nor to form 2. Furthermore, peaks were found to be shifted towards higher wavenumbers, namely peaks assigned to NH deformations. This suggests that an interaction between the drug and the polymer could be occurring. DSC data supports this hypothesis, as olanzapine’s melting point in both drug-polymer films and physical-mixtures revealed a Tonset severely lower than form 1 melting point. This work suggests that there appears to be an interaction between drug and polymers, which is proposed to be occurring through H bonding. Nonetheless, this interaction could be favourable as it could be interesting to stabilize small dimension crystals or even amorphous form of olanzapine. |
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