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Verification of the presence of probiotic bacteria in a cosmetic product using the polymerase chain reaction (PCR) technique
Raevskaya, Vera ; Kroupová, Zuzana (referee) ; Smetana, Jan (advisor)
This bachelor thesis focuses on the verification of the presence of probiotic bacteria in a cosmetic product using the polymerase chain reaction (PCR) technique. The theoretical part provides an overview of probiotics, their application in cosmetics and their effect on skin condition. Furthermore, the most commonly used molecular biological methods for the identification of probiotic organisms are described. In the practical part, the work focuses on the isolation of bacterial DNA from cosmetic products and its subsequent amplification by PCR. The amplified products were analyzed by agarose gel electrophoresis and detected by UV irradiation. The results showed the presence of bacteria of the genera Lactobacillus and Bifidobacterium, but the presence of bacteria of the genus Lactococcus, which were declared by the manufacturer together with the above genera, was not confirmed.
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Comparison of different types of magnetic carriers for DNA microisolation from foods
Koplík, Jerguš ; Lunerová,, Jana (referee) ; Kovařík, Aleš (advisor)
Micro-isolation of PCR-ready from fresh and dried legumes seeds and food products containing legumes (hummus) was tested. For optimization process magnetic microparticles PGMAox was used. Optimum weight plants and food material was 200 mg. For isolation of DNA from fresh legumes, mixture containing 500 L of CTAB extraction buffer, 1 L -mercaptoethanol and 500 L chloroform-octanol was used. For isolation of DNA from dried legumes seeds and food products volume of CTAB extraction buffer was increased to 1 000 L. To achieve higher purity of DNA some prepared homogenates was precipitate by isopropylalcohol. The optimized process of DNA isolation was used to prepare a homogenate from food products which DNA was isolated by different types of magnetic carriers. For comparison, non-porous magnetic carriers poly(glycidyl methacrylate) PGMAox, poly(2-hydroxyethyl methacrylate-co-glycidyl methacrylate) P(HEMA-co-GMA)ox covered by carboxyl groups and porous fully crosslinked microparticles poly(styrene-co-divinylbenzene) HPS-B-M-22-NH2, magnetic porous glass MPG and nanoparticles of iron oxides covered by poly(L-lysine) PLL were used. In average the highest concentration and the best purity of DNA was isolated by magnetic carriers P(HEMA-co-GMA)ox a PGMAox.
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Probiotic bacteria and authenticity of milk products
Storozhko, Viktoriya ; Rittich, Bohuslav (referee) ; Španová, Alena (advisor)
Probiotics are living microorganisms that have positive effects on human health after consumption. The theoretical part of the bachelor thesis describes properties and health effects of probiotics and their use in food industry. The experimental part was focused on the isolation of PCR-ready DNA from two dairy probiotic products. The presence of target bacterial DNA was confirmed using PCR methods.
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Probiotic bacteria and authenticity of milk products
Storozhko, Viktoriya ; Rittich, Bohuslav (referee) ; Španová, Alena (advisor)
Probiotics are living microorganisms that have positive effects on human health after consumption. The theoretical part of the bachelor thesis describes properties and health effects of probiotics and their use in food industry. The experimental part was focused on the isolation of PCR-ready DNA from two dairy probiotic products. The presence of target bacterial DNA was confirmed using PCR methods.
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Comparison of different types of magnetic carriers for DNA microisolation from foods
Koplík, Jerguš ; Lunerová,, Jana (referee) ; Kovařík, Aleš (advisor)
Micro-isolation of PCR-ready from fresh and dried legumes seeds and food products containing legumes (hummus) was tested. For optimization process magnetic microparticles PGMAox was used. Optimum weight plants and food material was 200 mg. For isolation of DNA from fresh legumes, mixture containing 500 L of CTAB extraction buffer, 1 L -mercaptoethanol and 500 L chloroform-octanol was used. For isolation of DNA from dried legumes seeds and food products volume of CTAB extraction buffer was increased to 1 000 L. To achieve higher purity of DNA some prepared homogenates was precipitate by isopropylalcohol. The optimized process of DNA isolation was used to prepare a homogenate from food products which DNA was isolated by different types of magnetic carriers. For comparison, non-porous magnetic carriers poly(glycidyl methacrylate) PGMAox, poly(2-hydroxyethyl methacrylate-co-glycidyl methacrylate) P(HEMA-co-GMA)ox covered by carboxyl groups and porous fully crosslinked microparticles poly(styrene-co-divinylbenzene) HPS-B-M-22-NH2, magnetic porous glass MPG and nanoparticles of iron oxides covered by poly(L-lysine) PLL were used. In average the highest concentration and the best purity of DNA was isolated by magnetic carriers P(HEMA-co-GMA)ox a PGMAox.
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