Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Determination of physico-chemical stability of toothpastes
Posztósová, Gyöngyi ; Vítová, Eva (oponent) ; Němcová, Andrea (vedoucí práce)
This diploma thesis is focused on determining the physico-chemical stability of toothpastes. It is divided into theoretical and practical part. The theoretical part of the work deals with toothpastes, their short history and composition. Stability studies and methods of stability analysis are described below. In the practical part were performed long-term and accelerated stability studies on anhydrous toothpastes, on water-based toothpastes and on toothpastes based on sodium bicarbonate. The physical stability of the products was evaluated by monitoring the appearance and color visually and odor sensory, the pH value using a pH meter and the viscosity with a rotational viscometer. Chemical stability was monitored by determining the free fluorine content by ion chromatography and by ion-selective electrode, total phosphates and potassium also by ion chromatography, sodium bicarbonate by titration, soluble zinc by atomic absorption spectrometry and water activity was also monitored.
The antimicrobial effects of plant extracts against yeast skin mycoses
Posztósová, Gyöngyi ; Rapta, Marek (oponent) ; Němcová, Andrea (vedoucí práce)
Superficial cutaneous mycoses are relatively widespread and affect more and more people. Currently are used drugs as ketoconazole, fluconazole and others to treat mycoses. Pathogens occasionally become resistant to these drugs. Medicinal plants have a long history in alternative medicine and they could be a good solution. This bachelor thesis deals with the study of antifungal activity of selected plants. Were prepared ethanol extracts of basil, betony, eucalyptus, turmeric, geranium, oregano and ginseng. The theoretical part of thesis contains a review of the most frequently occurring dermatomycoses. It describes plants as sources of natural substances with antimicrobial effect and the content of selected active substances. The experimental part is focused on the analysis of plant extracts. Was determined the content of total polyphenols, flavonoids and antioxidants. The antimicrobial activity was monitored against yeast Candida glabrata and against G- and G+ bacteria, specifically Escherichia coli and Micrococcus luteus. Finally, the cosmetic products with the addition of plant extract were prepared and tested against mycoses.

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