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Humic substances in cosmetics: characterization and stability studies of lip balm
Dostálová, Tereza ; Venerová, Tereza (referee) ; Enev, Vojtěch (advisor)
This diploma thesis deals with the creation of lip balm containing humate to achieve an antiviral effect against the Herpes simplex virus as one of the other possible treatment options for this disease. To visually enhance the product, a dye was prepared from beetroot, the characterization of which is also part of the work. The dye was separated into its individual components by thin-layer chromatography and analyzed by FTIR to describe the structural molecular units it contains. The lip balm itself was prepared in several variants, containing both humate and dye, containing only humate or dye, and in the form of a "blank" sample. These samples were subjected to a long-term four-month stability study, where two different storage conditions were used. The analysis consisted in the assessment of organoleptic properties, spreading properties, determination of the linear viscoelastic area, flow point, melting point and bioburden. For greater specificity, the effect of dye and humate was studied using diffusion and antimicrobial tests. At the end of the study, a sensory analysis was carried out to determine the possible success of the product among consumers.
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