Application Properties of Bath Liquids for Children Based on Sodium Laureth Sulfate with Addition of Different Molecular Weight Collagens Derived from Marine Sources

Abstract

This article investigates the influence of marine collagen of various molecular weights (Collagen Amino Acids—150 Da, Hydrolyzed Collagen—12,000 Da and Soluble Collagen—300,000 Da) on the functional properties of bath liquids for children based on anionic surfactants—sodium laureth sulfate. In addition to the aspects related to safety‐in‐use, which were presented in the authors' first work about marine collagen, consumers also expect bath cosmetics for children to have specific functional characteristics including viscosity or foaming properties. An increase in the molecular mass of marine collagen was found to be accompanied by an increase in dynamic viscosity and foaming ability and a decrease in the ability to emulsify fatty soil in the formulations under study. It can, therefore, be concluded that the addition of the highest molecular weight of marine collagen (300,000 Da) to bath liquids for children contributes not only to reducing the irritant effect caused by anionic surfactants, but also improves the usable properties of these types of cosmetics.

Effect of New Surfactants on Biological Properties of Liquid Soaps

“…This interaction probably involves the denaturation of α-helical keratin by unfolding a coiled polypeptide protein chain [ 30 , 31 ]. Thus, the high ability of a cosmetic product to emulsify fats may contribute to the removal of valuable, naturally occurring hydrophobic components from the skin surface and thus disrupt the structure of the intercellular cement of the epidermis [ 28 , 32 ]. This may consequently lead to excessive skin dryness and irritation.…”