Aggregation process in aqueous dissolutions of TRITON x-100 and CTAB with alginates

Authors

  • MSc. Margarita Hernández-Escalona Centro de Biomateriales, Universidad de la Habana, La Habana, Cuba
  • Téc. Med. Manáis Gómez-Hernández Centro de Biomateriales, Universidad de la Habana, La Habana, Cuba
  • Téc. Med. Patricia Peñate-Valldeperas Centro de Estudios de Productos Naturales, Facultad de Química, Universidad de la Habana, Cuba

Keywords:

sodium alginate, carboxymethyl alginate, CTAB, Triton X-100, CMC

Abstract

The influence of aqueous dissolutions of sodium alginate and carboxymethylated derivatives on the absorption and micellar critical concentration (CAC and CMC*) of Triton X-100 and CTAB surfactants was studied by tensiometry (γ) and conductimetry (κ). An inflection at 0.1x10-4 mole/L in the curve of γ vs [Triton X-100] in the presence of solutions of 0.1, 0.5 and 1 g alginate/L was observed; suggesting weak polymer-surfactant interaction. The CMC* in the presence of alginate, decreases to 1.0x10-4 mole/L. CAC and CMC* of CTAB in the presence of alginate and the greatest substituted derived are similar by both methods, CAC tends to decrease with concentration, while CMC* increased with the concentration of polysaccharide and in a presence of a highest substitution degree, characteristic behavior of systems with opposite charges. These show three critical concentrations: CMC*, CAC and another originated by interactions attributed to the presence of non-cooperative associations about 0,045x10-3 mole/L.

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Published

2020-03-04

How to Cite

Hernández-Escalona, M. M., Gómez-Hernández, T. M. M., & Peñate-Valldeperas, T. M. P. (2020). Aggregation process in aqueous dissolutions of TRITON x-100 and CTAB with alginates. Revista Cubana De Química, 32(1), 87–102. Retrieved from https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/5128

Issue

Vol. 32 No. 1 (2020)

Section

Artículos

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