Biodegradable poly (DL-lactide glycolide) microparticles as a vehicle for allergen-specific vaccines:: a study performed with Ole e 1, the main allergen of olive pollen

Ole e 1, the main allergen of the olive pollen, was entrapped in Poly (DL-lactide glycolide) microparticles by a solvent evaporation double emulsion technique. The physical properties of the microparticles, such as particle size, surface morphology, allergen entrapment rate and antigen release pattern were investigated. Microparticles with a spherical morphology displayed a size range of less than 2 mum in diameter and antigen loading up to 60-70% (w/w). SDS-PAGE and immunoblotting of the released Ole e 1 confirmed that the molecular integrity and the antigenic properties of Ole e 1 remained unaltered by the encapsulation process or polymer degradation. This finding suggests that microparticles displaying small particle sizes, rapid antigen release and a high allergen/polymer ratio may be a suitable delivery system for antigen in hyposensitization therapy against allergy. (C) 2002 Elsevier Science B.V. All rights reserved.