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The role of amphoteric surfactants in the quality control of selected usable properties of bath liquids





Key words: 

bath liquids, bath cosmetics, amphoteric surfactants.


Bath liquids are products which are designed to wash the whole body. Such scope of their use requires a proper design of their composition. On the other side bath liquids should have cleansing properties, allowing for the efficient removal of dirt. On the other hand they should have a proper softness against the skin. The main ingredients of bath liquids are anionic, cationic and amphoteric surfactants. Additionally, they include small amounts of various additives i.e. fragrance compositions, extracts, preservatives etc. In the paper the influence of the type of amphoteric surfactants on physicochemical and functional properties of bath liquids were analyzed. Five prototypes of bath liquids were developed and prepared. These formulations differed in the ratio of Cocamidopropyl Betaine to sulfobetaine of C10 chain length and sulfobetaine of C12 chain length (2:0, 1:1, 0:2), synthesized for the purposes of the present study. Each formulation contained amphoteric compounds of a total concentration of 2%. The remaining ingredients of bath liquids comprise (according to INCI): Sodium  Laureth Sulfate, Cocamide DEA, Propylene Glycol, Sodium Chloride, Sodium Benzoate, Colour Aqua. For the selected cosmetics the parameters such as: pH, viscosity, foaming, fat emulsifying power and irritation potential were evaluated. The properties of bath liquids were compared to a high-quality commercial product, containing in its composition Cocamidopropyl Betaine, as amphoteric compound. Based on the performed study it can be concluded that the use of new amphoteric surfactants of sulfobetaine group and Cocamidopropyl Betaine, widely used in commercial products, at weight ratios of 2:0, 1:1, 0:2 in the formulations of bath liquids has a significant impact on individual functional properties of the formulations. It has been shown, among others, that the use of sulfobetaine (C10) and Cocamidopropyl Betaine at a weight ratio of 1:1 is the most favorable for adjusting rheological properties, and the highest foamability was characteristic for the liquid containing sulfobetaine C10 and C12 without the addition of Cocamidopropyl Betaine. Prototypes of bath liquids obtained with amphoteric surfactants additives are delicate and does not cause skin irritation.

dr inż. Anna MAŁYSA Kazimierz Pulaski University of Technology  and Humanities in Radom Faculty of Materials Science, Technology and Design Chair of Chemistry, Department of Physical  and Inorganic Chemistry ul. Chrobrego 27, 26-600 Radom, Poland e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.





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