Abstract:
Aim :To prepare the influenza vaccine lyophilized liposomes and to characterize its particle distribution,encapsulation efficiency and immunogenicity.
Methods :Flu vaccine liposome based on the method of thin-film evaporation was prepared using phospholipids ,cholesterol and the purified influenza virus split vaccine,and was further subjected to frozen-drying.The polymorph was observed by microscope;the particle distribution and the average size were analysed by transmission electron microscope;its encapsulation efficiency was determined by Lowry method and the antibody titers were assessed by hemagglutination-inhibition after pulmonary delivery to mice.
Results :The reconstitated influenza vaccine liposome under electronic microscope were round or elliptic particles evenly distributed at a mean size of 2.14 μm,with the encapsulation efficiency of more than 80%.The antibody titer through pulmonary delivery was higher than that through intraperitoneal injection.
Conclusion :The prepared influenza vaccine lyophilized liposomes possess high encapsulation efficiency,better particle distribution and marked immunogenicity through pulmonary delivery to mice.Pulmonary delivery of influenza vaccine liposomes is a potential immunization approach worthy of further exploitation.