Comparison between the interactions of the cationic surfactant DODAB with xanthan and galactomannan.
Carbohydr Polym
; 115: 478-84, 2015 Jan 22.
Article
em En
| MEDLINE
| ID: mdl-25439922
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.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Polissacarídeos Bacterianos
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Tensoativos
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Compostos de Amônio Quaternário
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Mananas
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido