Study of molecular interactions between Chitosan and Vi Antigen

Area of Science:

• Biomaterials Science
• Computational Chemistry
• Vaccine Development

Background:

• Chitosan possesses unique properties making it suitable for drug delivery applications.
• Vi Antigen-based nanoparticles show promise for combating typhoid fever.
• Understanding Chitosan-Vi Antigen interactions is vital for optimizing delivery systems.

Purpose of the Study:

• To characterize Vi Antigen using spectroscopy and computational methods.
• To investigate the interaction between Chitosan and Vi Antigen through theoretical models.
• To propose models for Chitosan-Vi Antigen adsorption systems.

Main Methods:

• Experimental and theoretical Infrared (IR) spectroscopy for Vi Antigen characterization.
• Molecular Modeling and Computational Chemistry for Chitosan-Vi Antigen interaction studies.
• Development of two theoretical models: monomer and tetrasaccharide antigen.

Main Results:

• IR spectroscopy confirmed the presence of N-Acetyl and O-Acetyl groups in Vi Antigen.
• Molecular modeling identified optimal conformations and binding sites for Chitosan-Vi Antigen interaction.
• Specific interactions were observed between Vi Antigen's acetyl groups and Chitosan's functional groups (hydroxy, amino, methyl).

Conclusions:

• Chitosan nanoparticles exhibit significant interactions with Vi Antigen.
• The study provides insights into the binding mechanisms for Chitosan-Vi Antigen systems.
• These findings support the development of Chitosan-based nanoparticles for typhoid fever vaccines.