Articles by Jana Pavlačková in JoVE
Preparation of Keratin Hydrolysate from Chicken Feathers and Its Application in Cosmetics Pavel Mokrejš1, Matouš Huťťa1, Jana Pavlačková2, Pavlína Egner2 1Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlín, 2Department of Fat, Tenside and Cosmetics Technology, Faculty of Technology, Tomas Bata University in Zlín The goal of the protocol is to prepare keratin hydrolysate from chicken feathers by alkaline-enzymatic hydrolysis and to test whether adding keratin hydrolysate into a cosmetics ointment base improves skin barrier function (heightening hydration and diminishing transepidermal water loss). Tests are conducted on men and woman volunteers.
Other articles by Jana Pavlačková on PubMed
The Cosmetic and Dermatological Potential of Keratin Hydrolysate Journal of Cosmetic Dermatology. | Pubmed ID: 28164425 Although keratin hydrolysates have become established as standard components in hair and nail cosmetics, studies on the moisturizing effects of keratin hydrolysates do not appear among contemporary literature.
Comparison of Metrological Techniques for Evaluation of the Impact of a Cosmetic Product Containing Hyaluronic Acid on the Properties of Skin Surface Biointerphases. | Pubmed ID: 28614949 The aim of this research was to evaluate mutual interchangeability of four principally different biometric instrumental techniques designed for objective measurement of changes in the physical, mechanical, and topographical properties of the skin surface treated with commercial antiaging cosmetic products with hyaluronic acid. The following instrumental devices were used: Visioscope PC 35, Corneometer Multiprobe Adapter MPA 6, Reviscometer RVM 600, and 3D scanner Talysurf CLI 500. The comparison of the individual methods was performed using cluster analysis. The study involved 25 female volunteers aged 40-65. Measurements were taken before and after 30 daily in vivo applications of an antiaging preparation to the skin surface in the periorbital area. A slight reduction in skin surface roughness was recorded in 55% of the volunteers. On the contrary, a worsening from their initial states was detected in 25% of the subjects, while for 20%, no significant change was reported. Cluster analysis confirmed that the mentioned methodologies can be divided into two basic clusters, namely, a cluster of methods recording the changes in skin relief by means of optical techniques, and a cluster of methods investigating changes in hydration and anisotropy. In practice, the techniques in different clusters are not interchangeable and should be assessed separately.
Moisturizing Effect of Topical Cosmetic Products Applied to Dry Skin Journal of Cosmetic Science. Sep-Oct, 2013 | Pubmed ID: 24139432 One of the complications of "diabetes mellitus" is termed diabetic foot syndrome, the first symptoms of which include changes in the skin's condition and properties. The skin becomes dehydrated, dry, and prone to excessive formation of the horny layer, its barrier function becoming weakened. This function can be restored by applying suitable cosmetic excipients containing active substances. The aim of this study was to evaluate and compare the effects of commercially available cosmetic products (CPs) designed for the care of diabetic foot, through a group of selected volunteers using noninvasive bioengineering methods. Statistical surveys (p < 0.05) evaluated these CPs as regards to their hydration effect and barrier properties. Special attention was devoted to CPs with the declared content of 10% urea, and that the influence of this preparation's ability to hydrate and maintain epidermal water in the epidermis was confirmed.