Encapsulation of nabumetone by means of -drug: (β-cyclodextrin)2:polyvinylpyrrolidone ternary complex formation
[EN]The aim of the present study was to investigate the effect of the presence of the water-soluble polymer polyvinylpyrrolidone (PVP) MW=24,000 g/mol, on the complexing of the anti-inflammatory drug nabumetone, with β-cyclodextrin (β-CD). The data show that the polymer interacts with the free nabum...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2006 |
| País: | España |
| Institución: | Universidad de Salamanca (USAL) |
| Repositorio: | GREDOS. Repositorio Institucional de la Universidad de Salamanca |
| OAI Identifier: | oai:dnet:gredos______::4b1b746acb209739b0c7c93953106ba4 |
| Acceso en línea: | http://hdl.handle.net/10366/171025 |
| Access Level: | acceso abierto |
| Palabra clave: | Nabumetone b-cyclodextrin Polyvinylpyrrolidone Ternary inclusion complex Fluorescence fluorescencia |
| Sumario: | [EN]The aim of the present study was to investigate the effect of the presence of the water-soluble polymer polyvinylpyrrolidone (PVP) MW=24,000 g/mol, on the complexing of the anti-inflammatory drug nabumetone, with β-cyclodextrin (β-CD). The data show that the polymer interacts with the free nabumetone and with the nabumetone:β-CD inclusion complex, in both cases with a stoichiometry of 1:1. The interaction constants are 1.3×104 M-1 and 1.6×104 M-1, respectively. The presence of PVP, changes the drug:cyclodextrin interaction, a nabumetone:(β-CD)2:PVP complex being formed. In addition, the presence of PVP, produces a strong increase in the global binding constant, β2=(22.12±0.22)×106 M-2 at 1% PVP. In the ternary complex, the nabumetone is wrapped at both ends for the β-CD. In this complex the polymer seems to act as a bridge between both β-CD molecules that bind the nabumetone. |
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