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14:36
Combining QD-FRET and Microfluidics to Monitor DNA Nanocomplex Self-Assembly in Real-Time
Published on: August 26, 2009
Complete physicochemical characterization of DNA/chitosan complexes by multiple detection using asymmetrical flow
Pei Lian Ma1, Michael D Buschmann, Françoise M Winnik
1Department of Chemical Engineering and Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P. O. 6079 Succursale Centre-Ville, Montreal, Quebec, Canada H3C 3A7.
Analytical Chemistry
|November 9, 2010
Summary
Asymmetrical flow field-flow fractionation (AF4) coupled with multiple detectors provides a comprehensive analysis of DNA/chitosan complexes for gene delivery, revealing key characteristics like size and composition.
Area of Science:
- Biophysical Chemistry
- Materials Science
- Nanotechnology
Background:
- DNA/chitosan complexes are widely investigated as nonviral gene delivery vectors.
- Characterizing these complexes is crucial for optimizing their transfection efficiency.
- Existing methods may not offer a complete physicochemical profile in a single experiment.
Purpose of the Study:
- To develop and validate a single-method approach for comprehensive characterization of DNA/chitosan complexes.
- To analyze the influence of various preparation parameters on complex properties.
- To assess the accuracy of the developed analytical method.
Main Methods:
- Asymmetrical flow field-flow fractionation (AF4) coupled with UV-vis spectrophotometry, multiangle light scattering (MALS), and dynamic light scattering (DLS).
- Analysis of complexes prepared with varying DNA concentrations, N/P ratios, and chitosan molecular weights.
- Validation using ultracentrifugation and the Orange II dye depletion method.
Main Results:
- AF4/UV-vis/MALS+DLS provided hydrodynamic radius, size distribution, conformation, and composition in one experiment.
- Complexes ranged from 15 to 160 nm; larger particles formed with higher DNA concentration or higher chitosan molecular weight.
- Free Ch-rho content varied significantly with N/P ratio, indicating complex formation efficiency.
Conclusions:
- AF4/UV-vis/MALS+DLS is a powerful tool for complete physicochemical characterization of DNA/polycation complexes.
- The method allows for detailed understanding of how preparation parameters affect complex properties.
- This comprehensive analysis is vital for advancing nonviral gene delivery vector development.
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