Freeze-drying is used to improve the long term stability of pharmaceutical proteins. Sugars and polyols have been successfully used in the stabilization of proteins. However, their use in the development of freeze-dried antivenoms has not been documented. In this work, whole IgG snake antivenom, purified from equine plasma, was formulated with different concentrations of sorbitol, sucrose or mannitol. The glass transition temperatures of frozen formulations, determined by Differential Scanning Calorimetry (DSC), ranged between -13.5 °C and -41 °C. In order to evaluate the effectiveness of the different stabilizers, the freeze-dried samples were subjected to an accelerated stability test at 40 ± 2 °C and 75 ± 5% relative humidity. After six months of storage at 40 °C, all the formulations presented the same residual humidity, but significant differences were observed in turbidity, reconstitution time and electrophoretic pattern. Moreover, all formulations, except antivenoms freeze-dried with mannitol, exhibited the same potency for the neutralization of lethal effect of Bothrops asper venom. The 5% (w:v) sucrose formulation exhibited the best stability among the samples tested, while mannitol and sorbitol formulations turned brown. These results suggest that sucrose is a better stabilizer than mannitol and sorbitol in the formulation of freeze-dried antivenoms under the studied conditions.
Incompatibilidades de interfase en la interacción entre las micropartículas biológicas que normalmente circulan en la sangre y la superficie de los implantes de biomateriales están normalmente asociadas con posteriores reacciones de rechazo por parte del sistema inmune. Ello requiere un modelo explicativo de la conducta observada en la interface de los liposomas y las plaquetas en contacto con biomateriales y superficies inorgánicas. Por lo tanto, el análisis de la relación entre el equilibrio iónico de las fuerzas de superficie de atracción entre liposoma -superficie /grado de deformación y el cambio en las propiedades de la superficie de las nanopartículas liposomales absorbidas por la modificación de superficie de los liposomas con biopolímeros como el quitosano. Se ha hecho progreso en la comprensión de la dinámica de las interfaces para la consistencia de diferentesvesículas de lípidos como modelo, y se ha encontrado que el recubrimiento de biopolímero de vesículas de lípidos con quitosano proporciona mejor estabilidad física y un aumento en la interfaz entre los biomateriales y nanopartículas inorgánicas biomiméticas.
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