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Preservative systems for natural cosmetics
Koblasová, Dana ; Veselá, Mária (referee) ; Zemanová, Jana (advisor)
The aim of this bachelor thesis is to evaluate the antimicrobial activity of naturally derived preservatives against selected microorganisms. Theoretical part is focused on description of the most used natural, naturally derived and synthetic preservatives, on the safety of preservatives and finally, the issue of contamination of cosmetic products by microorganisms. In experimental part, antimicrobial activity of 4 naturally derived preservatives was evaluated against selected microorganisms, which were bacteria Micrococcus luteus, Kocuria rosea, Bacillus cereus, Bacillus subtilis, Serratia marcescens and one yeast Candida vini. The tested preservatives were from MinaSolve company - E-LEEN Green A, which contains pentylene glycol and phenylpropanol, E-LEEN Green OR, which is composed of citrus extracts, citric acid, ascorbic acid and pentylene glycol, Green B, which contains benzoic acid, sodium benzoate and pentylene glycol and Hexam+, which is a mixture of pentylene glycol and hexamidin diisethionate. Antimicrobial activity was evaluated by agar diffusion method. The highest antimicrobial activity showed Hexam+, the lowest E-LEEN Green OR. E-LEEN Green A and Green B did not show any antimicrobial activity against any microorganism in the 1% tested concentration. The measured values of the inhibition zones show that the most resistant microorganisms from all the tested in this thesis are Bacillus cereus and Bacillus subtilis and the least resistant are Micrococcus luteus and Kocuria rosea.
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Evaluation of the stability of cosmetic products
Kunertová, Aneta ; Pavelková, Renata (referee) ; Márová, Ivana (advisor)
This bachelor thesis deals with methods and parameters of evaluation of the stability of cosmetic products and application of selected tests on group of products. In the theoretical part, there are described basic types of cosmetic products. Definition of stability and characterization of two main testing types – long-term and accelerated are introduced. Selected tests are described in more detail. Another part deals with group of parameters categorized according to physical, chemical, sensory and microbiological properties observed during testing. Last parts are concentrated on influence of packaging on product stability and on evaluation. The experimental part focuses on preparation of cosmetic emulsion, its stability testing and comparison with 17 commercially available products. Among accelerated tests the cyclic test, thermal test, centrifugal test and microbial stress test are performed. It was determined that commercially available peeling C + citrus Planeta Organica has the highest stability. Satisfactory results were observed with the prepared emulsion.
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Evaluation of the stability of cosmetic products
Kunertová, Aneta ; Pavelková, Renata (referee) ; Márová, Ivana (advisor)
This bachelor thesis deals with methods and parameters of evaluation of the stability of cosmetic products and application of selected tests on group of products. In the theoretical part, there are described basic types of cosmetic products. Definition of stability and characterization of two main testing types – long-term and accelerated are introduced. Selected tests are described in more detail. Another part deals with group of parameters categorized according to physical, chemical, sensory and microbiological properties observed during testing. Last parts are concentrated on influence of packaging on product stability and on evaluation. The experimental part focuses on preparation of cosmetic emulsion, its stability testing and comparison with 17 commercially available products. Among accelerated tests the cyclic test, thermal test, centrifugal test and microbial stress test are performed. It was determined that commercially available peeling C + citrus Planeta Organica has the highest stability. Satisfactory results were observed with the prepared emulsion.
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Percepce reklamy zákazníky u vybraných kosmetických společností - komparativní studie
Korcová, Aneta
The subject of this thesis is to find out on the basis of comparative research what is the perception and evaluation of TV commercials for shower gels of cosmetic companies Dermacol, Radox, Dove and Nivea. The theoretical part covers mainly the issues of advertising, advertising psychology and marketing. The thesis also focuses on identifying the relationship and attitudes of customers towards the advertisement of shower gels. The overview of secondary data focused on cosmetic products and advertising is presented together with evaluation and interpretation of primary data obtained from electronic polling and personal interviews. At the end of the thesis, marketing recommendations and marketing campaign proposal for Dermacol Cosmetics Company are assigned.
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Preservative systems for natural cosmetics
Koblasová, Dana ; Veselá, Mária (referee) ; Zemanová, Jana (advisor)
The aim of this bachelor thesis is to evaluate the antimicrobial activity of naturally derived preservatives against selected microorganisms. Theoretical part is focused on description of the most used natural, naturally derived and synthetic preservatives, on the safety of preservatives and finally, the issue of contamination of cosmetic products by microorganisms. In experimental part, antimicrobial activity of 4 naturally derived preservatives was evaluated against selected microorganisms, which were bacteria Micrococcus luteus, Kocuria rosea, Bacillus cereus, Bacillus subtilis, Serratia marcescens and one yeast Candida vini. The tested preservatives were from MinaSolve company - E-LEEN Green A, which contains pentylene glycol and phenylpropanol, E-LEEN Green OR, which is composed of citrus extracts, citric acid, ascorbic acid and pentylene glycol, Green B, which contains benzoic acid, sodium benzoate and pentylene glycol and Hexam+, which is a mixture of pentylene glycol and hexamidin diisethionate. Antimicrobial activity was evaluated by agar diffusion method. The highest antimicrobial activity showed Hexam+, the lowest E-LEEN Green OR. E-LEEN Green A and Green B did not show any antimicrobial activity against any microorganism in the 1% tested concentration. The measured values of the inhibition zones show that the most resistant microorganisms from all the tested in this thesis are Bacillus cereus and Bacillus subtilis and the least resistant are Micrococcus luteus and Kocuria rosea.
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