O artigo “Interaction of Guar Gum galactomannans with the anionic surfactant Sodium Lauryl Ether Sulphate”, desenvolvido pelo agora mestre Carlos H. Seixas e como colaboradores a Dra. Mariana Mazetto de Carvalho, M.a. Gabriela Parchen, Dr. Rodolfo Piazza e M.a. Joslaine Jacumazo, e orientado pelo Prof. Dr. Rilton Alves de Freitas, foi aceito para publicação na revista “International Journal of Biological Macromolecules” (fator de impacto 5.16). Nele foi descrita a interação entre um polímero comumente utilizado na indústria cosmética, a goma guar, com um dos surfactantes mais utilizados em shampoos, sabonetes líquidos e detergentes. Como resultado é possível utilizar até metade da concentração de surfactante, na presença do espessante, com mesma detergência, reduzindo custos e mitigando impactos ambientais.
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Abstract
The interaction between galactomannans, guar gum (GG) with sodium lauryl ether sulphate (SLES) was demonstrated using conductometric, tensiometric, pyrene probe and 1H NMR analyses. SLES and GG formed aggregates and reduced the surface tension at a critical aggregation concentration. The interaction was attributed to the presence of surfactant ethoxyl (EO) groups, since in conductometric, tensiometry and pyrene probe analyses using the non-ethoxylated form, sodium lauryl sulphate – SLS, no aggregation was observed. The aggregates formed between SLES and GG presented a negative zeta potential indicating that the polymer is surrounded by SLES and according to the dynamic light scattering analysis (DLS), presented a size of approximately 26 nm. The determination of the thermodynamic parameters showed that the aggregation occurs spontaneously and is a driven-enthalpy and entropy process. SLES and GG interaction could be explored to produce formulations with lower concentrations of surfactants, using commonly used thickeners as GG.