title: Comparison between the interactions of the cationic surfactant DODAB with xanthan and galactomannan.
abstract: The interactions of the cationic surfactant DODAB with anionic xanthan (XAN) and nonionic galactomannan (GMC) polysaccharides in solution were investigated using tensiometry, differential scanning microcalorimetry (μ-DSC), zeta potential and dynamic light scattering (DLS) techniques and by the calculated thermodynamic parameters of ΔG(ves)(0), ΔG(ads)(0), Γ(max) and a(min). The surfactant formed large unilamellar vesicles (LUV) that aggregated with both the polymers in solution. Increasing DODAB concentrations resulted in greater and greater DODAB-XAN aggregates, high turbidity and even precipitation, while DODAB-GMC aggregates remained equal sized, clear solution and no precipitation observed. Further addition of DODAB to XAN solution was able to resuspend the precipitates. The interactions with both polysaccharides resulted in a more spontaneous adsorption of the DODAB-polymer aggregates at the air/solution interface with lower surfactant population.
authors.affiliation: BioPol Laboratory, Chemistry Department, Federal University of Paraná, R. Coronel F. H. dos Santos 210, 81531-980 Curitiba, Paraná, Brazil; CEB, Pharmacy Department, Federal University of Paraná, Av. Prof. Lothário Meissner 3400, 80210-170 Curitiba, Paraná, Brazil.
authors.forename: Gabriel A T
authors.initials: GA
authors.lastname: Kaminski
authors.affiliation: BioPol Laboratory, Chemistry Department, Federal University of Paraná, R. Coronel F. H. dos Santos 210, 81531-980 Curitiba, Paraná, Brazil.
authors.forename: Maria Rita
authors.initials: MR
authors.lastname: Sierakowski
authors.affiliation: CEB, Pharmacy Department, Federal University of Paraná, Av. Prof. Lothário Meissner 3400, 80210-170 Curitiba, Paraná, Brazil.
authors.forename: Roberto
authors.initials: R
authors.lastname: Pontarolo
authors.affiliation: BioPol Laboratory, Chemistry Department, Federal University of Paraná, R. Coronel F. H. dos Santos 210, 81531-980 Curitiba, Paraná, Brazil. Electronic address: rilton@quimica.ufpr.br.
authors.forename: Rilton Alves
authors.initials: RA
authors.lastname: de Freitas
mesh_terms: D000327:Adsorption; D005690:Galactose / Q000031:analogs & derivatives; D008351:Mannans / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D008351:Mannans; D011135:Polysaccharides, Bacterial; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; C012990:galactomannan; C015831:dimethyldioctadecylammonium; C002563:xanthan gum; D005690:Galactose
keywords: Cationic surfactant; DODAB; Galactomannan; Interaction; Natural polymer; Xanthan