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Interacciones de envasado en formas hidratadas y anhidras del antibiótico ciprofloxacina: un estudio de RMN en estado
Luís Mafra1, Sérgio M Santos, Renée Siegel
1Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal. lmafra@ua.pt
Journal of the American Chemical Society
|November 29, 2011
Resumen
La resonancia magnética nuclear (RMN) y la difracción de rayos X (XRD) revelan cómo la estructura cristalina afecta a la ciprofloxacina.
Área de la Ciencia:
- Química del estado sólido.
- Ciencia de los materiales ciencia de los materiales.
- Ciencia farmacéutica es la ciencia farmacéutica.
Sus antecedentes:
- La cristalografía y la espectroscopia son cruciales para comprender las formulaciones de medicamentos.
- La ciprofloxacina exhibe diferentes formas cristalinas, lo que afecta sus propiedades.
- La hidratación puede alterar significativamente el comportamiento en estado sólido de los productos farmacéuticos.
Objetivo del estudio:
- Para investigar los ensamblajes supramoleculares del anhidrato e hidrato de ciprofloxacina.
- Para cuantificar el impacto del empaque de cristales e hidratación en los cambios químicos de RMN.
- Evaluar la utilidad de los cambios químicos de RMN como indicadores de hidratación en fármacos insolubles.
Principales métodos:
- Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN) Espectroscopia experimental de Resonancia Magnética Nuclear (RMN).
- Difracción de rayos X (XRD) para el análisis de la estructura cristalina.
- Modelado computacional de las interacciones moleculares.
Principales resultados:
- Detallado (1) H y (13) C asignaciones de resonancia para Ciprofloxacina hidrato.
- Cuantificación de los cambios de desplazamiento químico debidos al envasado de cristales, incluidos los enlaces H y los contactos CH···π.
- Se observaron variaciones significativas en el desplazamiento químico (hasta 5 ppm) tras la absorción de agua, lo que indica sensibilidad a la hidratación.
Conclusiones:
- Los cambios químicos de RMN son sensibles al empaquetado de cristales e hidratación en la ciprofloxacina.
- Estos cambios pueden servir como detectores efectivos para los procesos de hidratación / deshidratación en hidratos poco solubles.
- Comprender las formas de estado sólido es vital para el desarrollo farmacéutico.
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