Sapropel muds have a different chemical composition and provide the anti-inflammatorySapropel muds, which have a unique composition, effectively affect the functions of the whole organism and, especially the skin. They possess the anti-inflammatory, anti-allergic action, protect the skin from destructive effects of free radicals, give it elasticity, firmness and freshness. They also moisten the horny layer of the epidermis, and improve cellular regeneration [4].Cosmetic products on the basis of sapropel are presented by different forms, but the most often in the form of masks (37.10%) and the natural raw material (15.70%) [5]. Masks are products of an intensive effect, and it causes exactly the spread of masks among the preparations of sapropel considering the diversity of the chemical composition and the pharmacological and cosmetic effects. To provide masks with plasticity and better organoleptic properties (elimination of a specific soil odour, the presence of small particles, the residues of plant life), as well as to expand the range of sapropel masks with the various pharmacological action (lifting, anti-cellulite, antiseborrheic and anti-acne effect, etc.) it was proposed to use one of the products of sapropel -the sapropel paste for the base of masks.The sapropel paste is a paste-like product of the natural origin made of the lake sapropel, it contains biologically active substances, and the complex of macroand microelements [6].By appearance the sapropel paste is a homogenous pasty mass of a dark brown colour with pH -6.7, the moisture content -83%, and the content of organic substances -76.63% [6].However, the sapropel paste is a medium for development of microorganisms, including anaerobic ones. Therefore, the aim of our study was to substantiate experimentally the choice of an effective preservative in the composition of cosmetic masks with the sapropel paste to prevent microbiological contamination and ensure their stability. Materials and MethodsThe objects of the research were experimental samples of the sapropel paste taken from the Prybych deposit of the Volyn region: Sample 1 (paste of sapropel); Sample 2 (paste of sapropel, 0.1% of nizin); Sample 3 (paste of sapropel, 0.01% of nizin, 0.8% of germaben); Sample 4 (paste of sapropel, 0.01 of nizin, 0.1% of euxyl K 100).The experimental samples of the sapropel paste obtained from the sapropel powder (the dry anhydrous product obtained from the native (natural) sapropel) and water by the method of cavitation with the speed from 100 to 3500 rpm for 30 min at the temperature of 50°C. Then they were cooled to the temperature of 35-40°C, and the preservatives were added.For the sapropel paste the structural and mechanical (rheologic) parameters were determined according to the requirements of the SPhU (1.0, 2.2.10). The studies were carried out on a Brookfild HB DV-PRO ΙΙ rotatory viscometer (USA) using the adapter of the rotatory type with coaxial cylinders (the spindle SS4-21 for the chamber with the volume of 8.3 g) in the range of the gradient of t...
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