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Pol J Cosmetol 2021, 24(3): 170-178pl  Cosmetic products used in the care of the skin of newborn and infant. Part II. Prescription composition and care profile of pediatric soaps and selected core soaps of Polish productionMarian M. Zgoda 1/, Marta Wróblewska 1/, Sławomira Nowak 2/, Wiesława Dukowicz 3/, Mikołaj H. Stefan 4/, Zbigniew Marczyński 5/ 1/ Wyższa Szkoła Kosmetyki i Nauk o Zdrowiu w Łodzi 2/ Katedra i Zakład Farmakognozji Uniwersytetu Medycznego w Łodzi 3/ Gabinet Pediatryczny Niepubliczny Zakład Opieki Zdrowotnej w Łodzi 4/ Biotechnologia Wydział Biologii i Ochrony Środowiska Uniwersytetu Łódzkiego w Łodzi 5/ Zakład Farmacji Aptecznej Katedra Farmacji Stosowanej Uniwersytetu Medycznego w Łodzi Summary Introduction. The cosmetics market offers, for the daily care of the skin of a newborn and infant, recommended by pediatricians and the Institute of the Polish Mother´s Health Center, soaps with a care and treatment profile. The physicochemical properties of their water solutions and, alternatively, Linda core soaps recommended for skin hygiene and care in adolescents and adults were investigated. Aim. The aim of the research of the tested types of soaps was to determine the content of water and volatile copmonents as well as to estimate the activity of the hydrogen ion pH(aH+) on the saponification sufrace and in model solution on the phase boundary. Material and methods. The material for the comparative tests were soaps for children and soaps of the "Linda" type for adolescents. Methods recommended by Polish Pharmacopoeia nad Polish Standards were used to measure pH(aH+), surface tension and electrical conductivity of aqueous solution. The content of water and volatile components was determined by the gravimetric method. Results. The water content in pediatric soaps is 8.34-11.79%, while in "Linda" soaps it is 7.95-14.23%. The measured activities of the pH(aH+) hydrogen ion indicate that these are alkaline solutions of anionic surfactants with high values of electrical conductivity. Model soap solutions lower the surface tension at the phase boundary below 30 mJ/m2, while during the bath the surface tension is in the range of 48.0-52.0 mJ/m2. The solutions of the pediatric soap "Baby Dove" are characterized by the equilibrium and neutral activity of the hydrogen ion. Conclusions. The determined content of water and volatile components determines the effective hydrophilic erosion of the soap surface. The obtained results indicate that we did not observe a significant difference in the application between the recommended soaps for children and the core soaps of the "Linda" type. Key words: pediatric soaps, core soaps, activity of pH(aH+), surface tension, electrical conductivity, content of water and volatile components |