Abstract

HERNANDEZ-CEDENO, Mabel et al. Adsorption conditions of a vacunal candidate based on outer membrane vesicles of Salmonella Paratyphi A in aluminum adjuvants. Vaccimonitor [online]. 2019, vol.28, n.2, pp.62-67.  Epub Aug 01, 2019. ISSN 1025-028X.

The immunostimulation capacity of most vaccines is enhanced through antigen adsorption on aluminum adjuvants. The changes in adsorption conditions (pH, adsorption time), could change the amount of antigen adsorbed and therefore the ability to stimulate the immune system. The Finlay Institute of Vaccine researches a new vaccine candidate based on outer membrane vesicle from Salmonella Paratyphi A (OMV-SPA). The study aim was to determine adsorption condition of OMV-SPA with two aluminium adjuvants (Al(OH)3 and AlPO4). OMV-SPA was adsorbed in both adjuvants under differences conditions of pH and time. Parameters as adsorptive capacity (qm) and adsorption coefficient (Kd) were determined by construction of Langmuir Isotherm. The lot of OMV-SPA used is composed by population of nanostructure with a particle size between 60 and 100 nm. Adsorption of OMV-SPA in both adjuvants showed values ≥95% in neutral pH (6.5-7.0). OMV-SPA with AlPO4 got equilibrium state in less time (99% from 30 min) compared with Al(OH)3 (95% from 3 h). Isotherms from both adjuvants described Langmuir model (R2≥0.99), with qm and Kd values very different between adsorption systems. As conclusion, the study showed that OMV-SPA was adsorbed satisfactorily in both aluminium adjuvants, process in which are involved different adsorption mechanism.

Keywords : Salmonella Paratyphi A; adsorption; adjuvants; aluminum hydroxide; aluminum phosphate.

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