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Quenching de fluorescencia

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Quenching de fluorescencia

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    1. “Quenching” de fluorescencia quenching = desactivación= apagamiento = menor emisión IF (Q) < IF (-Q) Reacciones en el estado excitado (Quenching colisional) Entrecuzamiento intersistema a estado Triplete Rearreglos moleculares Transferencia de energía Transferencia de carga Formación de complejo en el estado basal (Quenching estático)

    9. Quenching dinámico o colisional Se requiere contacto entre Q y F, interacción molecular Quenching dinámico o colisional: Q + F* Q debe difundir hacia F distancias moderadas (a diferencia de relajación por solvente)

    26. Eficiencia FRET

    27. Formación de agregados moleculares

    28. Usos de fluorescencia en bioquímica Localización subcelular Cambios en la concentración Interacciones moleculares Cambios conformacionales Distancias intra/intermoleculares Difusión rotacional Caracterización estructural Actividad enzimática ???

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