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Los ensamblajes supramoleculares de los nucleósidos anfífilos de la fosfocolina de los nucleósidos
Louis Moreau1, Philippe Barthélémy, Mohamed El Maataoui
1Faculté des sciences d'Avignon 33, rue Louis Pasteur, F-84000 Avignon, France.
Journal of the American Chemical Society
|June 17, 2004
Resumen
Los nuevos anfífilos de uridina fosfocolina se autoensamblan en varias estructuras supramoleculares como fibras, vesículas e hidrogeles. Estas estructuras son térmicamente reversibles y pueden encapsular agentes terapéuticos como el ADN.
Área de la Ciencia:
- Química supramolecular de las moléculas.
- Ciencia de los materiales Ciencia de los materiales.
- Los biomateriales son biomateriales.
Sus antecedentes:
- Los anfífilos de fosfocolina de la uridina son moléculas novedosas con aplicaciones potenciales en la administración de fármacos y biomateriales.
- Comprender su comportamiento de autoensamblaje es crucial para diseñar sistemas supramoleculares funcionales.
Objetivo del estudio:
- Para sintetizar y caracterizar una nueva familia de anfífilos de uridina fosfocolina.
- Investigar las propiedades de autoensamblaje de estos anfífilos en soluciones acuosas y orgánicas.
- Explorar el potencial de estos anfífilos en la formación de hidrogeles y organogeles para la encapsulación de agentes terapéuticos.
Principales métodos:
- Una ruta sintética de cuatro pasos para la preparación de anfifilos.
- Caracterización fisicoquímica utilizando calorimetría de barrido diferencial, dispersión de rayos X de ángulo pequeño, espectroscopias UV-vis y de dicroísmo circular.
- Técnicas de microscopía que incluyen luz, microscopía electrónica de transmisión (TEM) y microscopía electrónica de barrido (SEM).
Principales resultados:
- Las anfifilas sintetizadas se ensamblan espontáneamente en diversas estructuras supramoleculares: vesículas, fibras, hidrogeles y organogeles.
- Los anfifiles con cadenas de alquilo saturadas forman fibras helicoidales similares al ADN en el estado cristalino y bicapas por encima de la temperatura de fusión (Tm).
- Se observó una transición térmicamente reversible entre las bicapas y las fibras. Hidrogeles formados por encima del 6% w/w de concentración, capaces de atrapar el ADN. Los organogeles se formaron en el ciclohexano.
Conclusiones:
- Los nuevos anfífilos de uridina fosfocolina exhiben un versátil comportamiento de autoensamblaje, formando varias arquitecturas supramoleculares.
- Estos anfífilos demuestran potencial como bloques de construcción para hidrogeles y organogeles funcionales, con aplicaciones en sistemas de administración de fármacos.
- La naturaleza térmicamente reversible del autoensamblaje ofrece propiedades sintonizables para el diseño de materiales.
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