"Prevention of structural perturbation and aggregation of hepatitis B surface antigen: screening of various additives".
The instability of protein and antigen(s) during encapsulation in biodegradable polymers by water-in-oil-in-water (w/o/w) encapsulation is well established. The aim of present study is to screen various additives to prevent the inactivation and loss of immunogenicity of HBsAg upon its exposure to the water/CH(2)Cl(2) (methylene chloride) interface by simulating the formulation steps involved in the preparation of microspheres. The secondary structure of HBsAg, recovered under different conditions after primary emulsification, was investigated by FTIR spectroscopy and Circular Dichorism. Subsequently, PLGA microspheres were formulated and characterized for their size, shape, incorporation efficiency, antigen integrity, and immunogenicity. The immunogenicity and the HBsAg recovery under different conditions were tested in BALB/c mice. Inulin and trehalose were found to be better stabilizing agents to prevent the aggregation, the structural perturbations and immunogenicity of HBsAg. This study substantiated that inulin could overcome the aggregation and denaturing effects of the water/CH(2)Cl(2) interface upon HBsAg during emulsification step and upon encapsulation.
Department of Pharmaceutical Sciences, Dr. Hari Singh Gour University, Sagar (MP) - 470003, India.
Priti
P
Tomar
Namita
N
Giri
Vijai S
VS
Karwasara
Ravi S
RS
Pandey
V K
VK
Dixit
D000818:Animals; D002214:Capsules; D004339:Drug Compounding; D005079:Excipients / Q000737:chemistry*; D005260:Female; D006514:Hepatitis B Surface Antigens / Q000008:administration & dosage* / Q000737:chemistry* / Q000276:immunology; D019344:Lactic Acid / Q000737:chemistry; D008752:Methylene Chloride / Q000737:chemistry*; D051379:Mice; D008807:Mice, Inbred BALB C; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011489:Protein Denaturation; D055550:Protein Stability; D017433:Protein Structure, Secondary; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry
D002214:Capsules; D005079:Excipients; D006514:Hepatitis B Surface Antigens; D014867:Water; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D008752:Methylene Chloride