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2004 APR 7 - (NewsRx.com & NewsRx.net) -- A hepatitis A peptide has been covalently linked to liposomes.
"In this work we have studied the conjugation of the immunogenic peptide sequence (110-121) belonging to the VP3 capsid protein of hepatitis A virus to the surface of preformed liposomes by means of an amide bond between the vesicles and the synthetic peptide. The surface activity of the conjugate at air/water interface was determined. Moreover, the interaction of the conjugate with lipids was also studied recording the pressure increases produced after the injection of the liposome-peptide preparation under dipalmitoylphosphatidylcholine (DPPC), dipalmitoylphosphatidylglycerol (DPPG) and stearylamine (SA) monolayers at different initial surface pressures," scientists writing in the International Journal of Pharmaceutics report.
"As expected, due to the negative net charge of the liposome-peptide complex, the higher interaction was found with positive charge monolayers (SA)," stated M. Munoz and colleagues at Consejo Superior de Investigaciones Cientificas in Spain. "However, the conjugate was also able to incorporate to zwitterionic and anionic lipids. This behavior was also confirmed performing compression isotherms of monolayers of these lipids spread on subphases containing the conjugate."
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Source: HighBeam Research, Hepatitis A peptide covalently linked to liposomes.