title: Prediction of diffusion coefficients of plasmids.
abstract: The ability to predict diffusion coefficients is important in the design, analysis, and operation of plasmid downstream processing operations such as membrane and fixed-bed chromatography. A correlation is proposed to predict the diffusion coefficient, D, of supercoiled plasmid DNA molecules in dilute solutions on the basis of the molecular weight, M, or size. Experimental data (18 points) collected from the literature confirmed the proposed variation of D with plasmid molecular weight as D proportional, variant M(-2/3), for molecules within the 1,800-287,100 base-pair range. The correlation was able to estimate the available experimental results with an average error of 6.3%.
authors.affiliation: IBB-Institute for Biotechnology and Bioengineering, Center for Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisbon, Portugal. miguelprazeres@ist.utl.pt
authors.forename: D M F
authors.initials: DM
authors.lastname: Prazeres
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D004058:Diffusion; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D009690:Nucleic Acid Conformation; D010316:Particle Size; D010957:Plasmids / Q000737:chemistry* / Q000648:ultrastructure*
chemical_list: D003102:Colloids