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Evaluation of the presence of probiotic bacteria in a food supplement using molecular biological methods
Dvornyi, Nikolai ; Brázda, Václav (referee) ; Smetana, Jan (advisor)
Probiotics are beneficial microorganisms that, when administered properly, can provide health benefits to the host, such as aiding digestion and boosting the immune system. Their effectiveness and benefits depend on the specific strain of microorganism. These strains are often from the genera Lactobacillus, Bifidobacterium, and represent natural hosts of the gastrointestinal tract. This bachelor thesis focuses on the identification of probiotic bacteria in a commercially available dietary supplement Linex® Forte using molecular biological methods, mainly polymerase chain reaction (PCR). The aim was to verify the presence of the claimed probiotic cultures of Lactobacillus acidophilus, Bifidobacterium animalis, and to compare the results with the manufacturer's claims. Therefore, two DNA isolation methods were used: phenolchloroform extraction and the commercial purification kit OMNI International. The isolated DNA was then analyzed by domain, genus and species-specific PCR. The results show that the methods used are suitable for the identification of probiotic bacteria and confirm their presence in the selected product.
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