Abstract
Aqueous binary solutions consisting of CTAB and niacinamide or d-panthenol were tested using conductometric, spectroscopic and tensiometric methods in two concentration variants. Based on the conductometric tests, the CMC values were determined and the interaction parameter (β) was estimated. Slight antagonistic interactions were found in mixed micelle systems. Based on tensiometric measurements, the parameters of the adsorption at the interface were determined, the adsorption process was thermodynamically more preferred for the CTAB-niacinamide system. The Wilhelmy method was used to determine the effect of niacinamide and d-panthenol addition on the value of the contact angle and thus on the wetting properties of the binary systems tested. UV–vis analysis enabled the identification and understanding of structural changes and interactions occurring in the studied binary systems. Moreover free Radical Scavenging Capacity of investigated systems was evaluated using DPPH• assay. IC50 value indicated weak antioxidant activity of niacinamide. An increase in Free Radical Scavenging Capacity of CTAB-N system was observed compared to pure niacinamide.
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