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Identification of microorganisms in cosmetic products with probiotics
Langová, Denisa ; Španová, Alena (referee) ; Trachtová, Štěpánka (advisor)
Probiotics products are an integral part of the current market. Products containing probiotics cultures are also cosmetic products. The first part of the study focuses on testing of bacterial survival abilities in the environment of preservatives presented in cosmetic products. Collection strains of genus Lactobacillus were used for these tests. Another part of the study focuses on isolation of bacterial DNA from probiotic cosmetic products Ryor, Yoghurt of Bulgaria, FeminaMed and Lactovit Activit in PCR-ready quality. DNA was isolated by fenol extraction and with magnetic particles. Presence of bacteria was proved by genus and species specific PCRs Lactobacillus. Species specific PCR for identification of Lactobacillus pentosus was optimalized. Species identification was in accord with data declared by producers.
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Study of the effect of cosmetics on the human skin microbiome using molecular techniques
Alexová, Adéla ; Kovalčík, Adriána (referee) ; Němcová, Andrea (advisor)
The theoretical part of the thesis is focused on the basic description of the physiology of the skin, human microbiome and a brief summary of where individual microorganisms occur. Furthermore, there is a list of analytical and microbiological methods that are used in this thesis. In the beginning, the practical part is focused on determination of antimicrobial effects of the chosen cosmetic products using microbial tests. Then, the inhibiton and microbial effect of the chosen cosmetic products on examined microorganisms has been measured using ELISA method. The second part of the thesis is focused on the isolation of bacterial DNA in quality that would be high enough to be used for amplification in PCR. There has been an optimalization of isolation of microbial DNA that was to be found on tested subjects’ skin. The presence of chosen microorganisms on skin before and after the usage of cosmetic products was measured using a PCR method. PCR products were then detected using gel electrophoresis. From the gathered data it is clear that the number of observed microorganisms has changed significantly after the application of cosmetic products.
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Development of methods for determination of authenticity of cosmetic products with a plant component
Langová, Denisa ; Brázda, Václav (referee) ; Vorlová, Lenka (referee) ; Márová, Ivana (advisor)
In the final thesis, methods were developed for determining the authenticity of cosmetic products and food products with a plant component. The presence of natural ingredients in a series of model and commercial cosmetic products was verified and their authenticity was verified, too. The focus of the work was the development of a molecular-biological method for the detection of plant components (herbs, fruits, essential oils) and probiotics present in cosmetic products. Commercially available isolation kits were used for the isolation of DNA from cosmetic products and the method was optimized for the isolation of plant DNA present in cosmetic products. The presence of a plant matrix in cosmetic products was detected by the polymerase chain reaction (PCR) method. Instrumental methods were used to detect the presence of fragrance allergens in cosmetic products. A method of quantifying these allergens using liquid chromatography was introduced and the measurement results were compared with the results of gas chromatography with mass detection. The proposed method of isolation and subsequent amplification of plant DNA is suitable for determining the authenticity of herbal ingredients in cosmetic products. The proposed HPLC method is a simple and inexpensive method suitable for determining the allergens present in the amount necessary to comply with EU analyte legislation and in the required sensitivity (except for hydroxycitronellal). Both methods are suitable to be used for the analysis of food products, too.
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Identification of probiotics in cometic product using PCR technique
Akmalova, Adelina ; Langová, Denisa (referee) ; Smetana, Jan (advisor)
This bachelor thesis deals with the identification of probiotic microorganisms in cosmetic products by polymerase chain reaction (PCR). The aim of this work was to confirm the presence of bacterial DNA in cosmetic products containing probiotic microorganisms. The theoretical part of the thesis focuses on the role of probiotic microorganisms in maintaining skin health and their effects on the human body. Different methods for the identification of probiotics are also highlighted with a focus on molecular genetic approaches. In the experimental part of the work, two cosmetic products with declared presence of probiotic microorganisms were tested. Two methods were used to extract DNA from the products: phenol extraction and commercial kit method. Furthermore, amplification of a specific region of the 16S rRNA gene was performed by PCR. The PCR products were subjected to agarose gel electrophoresis and visualized by ultraviolet light. All cosmetic products showed the presence of the Bacteria domain and the genus Lactobacillus. In addition, species-specific PCR confirmed the presence of the declared probiotic species Lactobacillus pentosus and Lactobacillus bulgaricus in the products.
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Chování spotřebitele při nákupu kosmetických výrobků
Pařízková, Lucie
This thesis deals with consumer behaviour during the purchase of cosmetics products, focusing to skin care products and to women’s segment. The purpose of this work is to formulate several recommendations for the manufacturers and sellers of skin care products based on the results of the questionnaire survey. These recommendations could help them to better identify customers preferences during the purchase of skin care products and further enable them to adjust or improve their offer and eventually other sales areas. Cluster analysis is used to segment customers and specific recommendations are made for each segment.
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CITES plants in cosmetic products
JAKUBCOVÁ, Claudia
This thesis deals with the properties of endangered plant species listed in CITES Appendices that are contained in cosmetic products on the Czech market and the characteristics of these products. The attitude and responsibility of companies towards environmental protection issues and the evaluation of these cosmetic products by users were investigated by questionnaires. A total of 20 species were found in 90 cosmetic products, of which 12 representatives were from the family of Orchideaceae, two species of cacti (Selenicereus grandiflorus, Opuntia ficus-indica), ginseng (Panax ginseng, Araliacae), Aloe ferox (Asphodelaceae), Euphorbia antisyphilitica (Euphorbiaceae), Aniba rosodora (Lauraceae), Aquilaria malaccensis (Thymelleaceae), Cyathea medullaris (Cyatheaceae). No cases of collection in the wild were found. All the evidence shows that the plants used in cosmetics are cultivated and therefore the CITES Convention is not violated. Users were satisfied with the cosmetic products.
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Study of the effect of cosmetics on the human skin microbiome using molecular techniques
Alexová, Adéla ; Kovalčík, Adriána (referee) ; Němcová, Andrea (advisor)
The theoretical part of the thesis is focused on the basic description of the physiology of the skin, human microbiome and a brief summary of where individual microorganisms occur. Furthermore, there is a list of analytical and microbiological methods that are used in this thesis. In the beginning, the practical part is focused on determination of antimicrobial effects of the chosen cosmetic products using microbial tests. Then, the inhibiton and microbial effect of the chosen cosmetic products on examined microorganisms has been measured using ELISA method. The second part of the thesis is focused on the isolation of bacterial DNA in quality that would be high enough to be used for amplification in PCR. There has been an optimalization of isolation of microbial DNA that was to be found on tested subjects’ skin. The presence of chosen microorganisms on skin before and after the usage of cosmetic products was measured using a PCR method. PCR products were then detected using gel electrophoresis. From the gathered data it is clear that the number of observed microorganisms has changed significantly after the application of cosmetic products.
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Authenticity of natural plant component in cosmetics products
Kubalová, Michaela ; Fialová, Lenka (referee) ; Němcová, Andrea (advisor)
The purpose of this thesis was to study the authenticity of selected natural ingredients in cosmetic products. These were specifically cosmetic products that contained citruses, mint or lavender. Commercially available isolation kits were used for DNA isolation. The presence of plant origin DNA was verified by PCR method using primers specific for the ITS2 region of plants. The presence of limonene, a significant allergen contained in said plants, was determined in the samples by PCR method using primers for limonene synthase. At the same time, its presence was verified by HPLC method. In addition, two primers were tested for lavender and monitored for their efficacy, with no significant difference in the usage.
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Identification of probiotic bacteria in cosmetic creme using PCR technique
Folwarczná, Tereza ; Langová, Denisa (referee) ; Smetana, Jan (advisor)
Probiotic bacteria are found in a wide range of food products and their internal use brings many positive effects for the human body. Thanks to these benefits, probiotic bacteria began to be used in the cosmetic industry with the assumption of similar positive effects as with internal administration. The aim of this bachelor's thesis was the theoretical part, which was devoted to various genera of probiotics, which are most often used in cosmetic products, in which skin diseases, surface probiotics are most often used and what effect they bring in treatment. Subsequently, the most commonly used molecular-biological methods for the identification of probiotic bacteria were described. In the experimental part, the DNA of probiotic bacteria declared by the manufacturer was isolated from two cosmetic creams and subsequently their presence was verified using the polymerase chain reaction method.
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Cosmetics preparations against acne
Měšťánková, Zuzana ; Skoumalová, Petra (referee) ; Němcová, Andrea (advisor)
Hemp is a plant containing a number of active substances that can be used in cosmetics and pharmacy. The subject of this bachelor thesis is the multiplication of active substances by mixing cannabis with herbs that have anti-inflammatory effects. The theoretical part contains a description of the determined antioxidants and cannabinoids. The experimental part focuses on measuring the content of these substances in extracts created from the dry parts of herbs and hemp variety Ferimon. The work is also focused on the preparation of a cream containing cannabis and herbal extracts, which are aimed at inhibiting the formation of acne. The antimicrobial effect of creams and extracts was investigated on bacteria Propionibacterium acnes and Micrococcus luteus. The analysis of the extracts shows that the largest amount of active substances contained a mixture of mountain arnica and hemp, which also showed a good antimicrobial effect against both types of bacteria. The creams showed a low inhibitory effect due to the low content of active substances.
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