Study of interaction between cationic surfactant (CTAB) and ascorbic acid/ascorbic acids derivatives by tensiometric and spectroscopic methods

The interactions between the cationic surfactant-cetyltrimethylammonium bromide (CTAB) and ascorbic acid and its derivatives in an aqueous media were investigated by using tensiometric and spectroscopic methods. On the basis of the surface tension isotherms, the values of the critical micelle concentration were determined also the adsorption parameters (the Gibbs free energy of adsorption, the surface excess at the saturated interface, the minimum molecular area in the adsorption layer at the saturated interface) were calculated using the Szyszkowski equation. The charged pseudophase model was adopted for define the Gibbs free energy of micellization. The infrared analysis (FTIR) contributed to the estimation of the possibility of the existence of interactions prevailing in the analyzed systems. The effect of CTAB-ascorbic acid/ascorbic acid derivatives interactions on their antioxidant activity was analyzed. Sets of ascorbic acid, 3-O-ethyl ascorbic acid and ascorbyl glucoside solutions differing in CTAB concentration were prepared. For the total antioxidant capacity determination, the Ferric Reducing Antioxidant Power (FRAP) assay and 1,1-diphenyl-2-picrylhydrazyl (DPPH') assay were used. The results obtained for CTAB -ascorbic acid/ascorbic acid derivatives systems were compared with the ones obtained for pure antioxidants. (c) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

The interactions between the cationic surfactant CTAB and ascorbic acid and its derivatives in aqueous media were investigated. Surface tension isotherms were used to determine the critical micelle concentration and adsorption parameters. Infrared analysis contributed to estimating the existence of interactions in the systems. The effect of CTAB-ascorbic acid/ascorbic acid derivatives interactions on antioxidant activity was analyzed.