Browsing by Author "Kodors, Sergejs"

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    The Application Perspectives of Lake Clay Infused with Natural Active Agents - Essential Oils in Cosmetology and Dermatology
    (Rezekne Higher Education Institution, 2024) Tretjakova, Rasma; Misiņa, Samanta Marija; Deksne, Aurelija; Brakovska, Aija; Kodors, Sergejs; Paidere, Jana
    The aim of the research is to experimentally test and scientifically substantiate the mixture of lake clay and a natural active agent – essential oil, in perspective of its application in cosmetology and dermatology. Sensory properties of lake clay and mixtures of lake clay with essential oils were tested. The presence and quantity of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, Escherichia coli, and aerobic mesophilic microorganisms in lake clay and lake clay with essential oils mixtures were determined. Thyme (Thymus vulgaris), apple mint (Mentha suaveolans), and caraway (Carum carvi) essential oils, which not only improve the cosmetic value of the product but also act as antimicrobial agents and preservatives, showed the best results. They meet the requirements of Latvian Cabinet Regulation No. 354 “Procedure for Meeting the Significant Requirements for Cosmetics” and European Standard EN ISO 17516: 2014, Cosmetics - Microbiology - Microbiological limits.
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    Lake Zeilu clay application induced changes in human skin hydration, elasticity, transepidermal water loss and PH in healthy individuals
    (2020-09-01) Misiņa, Samanta Marija; Tretjakova, Rasma; Kodors, Sergejs; Zavorins, Aleksejs; Department of Dermatology and Venereology
    Clay has a great biomedical application potential, however there are just a few instrumental studies and the impact of lake clay on the skin has not yet been studied. The DermaLab skin analysis system (Cortex Technology) was used for hydration, elasticity, transepidermal water loss (TEWL) and pH measurements after lake clay facial applications. Research included short-term tests (measurements 20 and 60 min after clay application) and long-term tests (application every 4th day for 3 weeks with measurements 20-24 h post-application). Control measurements and application tests to exclude contact allergy were made beforehand. No volunteer (n = 30) had positive allergic reaction. The matched-pairs design was applied: the right and left parts of forehead were used for the test and control groups. The Wilcoxon signed-rank test (significance level p = 0.001) was applied for statistical analysis. There were statistically significant pH changes demonstrated during the short-term measurements. The long-term measurements provided data that clay significantly improves skin hydration and elasticity.