Chitosan conjugates for DNA delivery

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Chitosan and maltodextrin are biocompatible polymers with potential in drug delivery.
• Modifying chitosan can enhance its solubility and applicability in biological systems.
• Developing efficient and safe DNA delivery systems remains a critical challenge in gene therapy.

Purpose of the Study:

• To synthesize and characterize graft copolymers of chitosan and maltodextrin.
• To investigate the self-assembly properties and DNA interaction of these copolymers.
• To evaluate the potential of the developed copolymer nanoparticles for DNA delivery.

Main Methods:

• Graft copolymer synthesis via reductive amination of low molecular weight chitosan.
• Characterization using nuclear magnetic resonance (NMR) spectroscopy to determine the degree of substitution.
• Analysis of self-assembly into nanoparticles and DNA interaction using dynamic light scattering and electrophoretic mobility measurements.

Main Results:

• Chitosan-maltodextrin graft copolymers with a high degree of substitution (≥70%) were successfully synthesized.
• The copolymers are water-soluble at pH 7.4 and self-assemble into spherical nanoparticles (approx. 300 nm).
• Optimal mass polymer/DNA ratios for nanoparticle-DNA complexation were determined to be 3-3.5 at the isoelectric point.

Conclusions:

• The synthesized chitosan-maltodextrin copolymers exhibit favorable properties for nanoparticle formation.
• Efficient interaction between the copolymer nanoparticles and DNA was demonstrated.
• This system holds significant promise as a novel non-viral vector for DNA delivery.