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Identification of probiotic bacteria with the use of PCR from plant frementation diary products
Kuljovská, Tereza ; Langová, Denisa (referee) ; Smetana, Jan (advisor)
Probiotics are encountered daily, either by targeted application of dietary supplements containing live cultures of lactic acid bacteria or by consuming traditional fermented products including dairy or non-dairy products. These cultures can significantly affect intestinal microbiota, particularly during digestive discomfort or problems associated with diarrheal diseases or infectious gastritis. This work focuses on the isolation of probiotics from fermented plant-based products that are also suitable for vegetarians and vegans, whose numbers are currently increasing. In addition to traditional lacto-fermented foodstuffs, there is another alternative in the form of Kombucha. Probiotic bacteria isolated from real samples were subjected to polymerase chain reaction (PCR) to identify them. Presence of the Bacteria domain was detected, and with more specific amplification, the presence of the genus Lactobacillus was detected too, using the specific primers. The amplification resulted in individual fragments were visualized by agarose gel electrophoresis.
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Detection of undeclared fruit species in foodstuffs using methods of molecular biology and instrumental methods
Svobodová, Petra ; Wikarská, Monika (referee) ; Fialová, Lenka (advisor)
This thesis is focused on the detection of apple component in fruit-based baby food. The theoretical part deals with the fruit itself – the apple; food adulteration as a reason for the control of food composition and methods, both instrumental and those of molecular biology, by which food adulteration can be detected. In the experimental part, commercial products containing apple puree were purchased and model mixtures were prepared as replicas of the purchased products. DNA was isolated from these samples, its amplifiability was verified, and the presence of the apple component was detected after the selection of suitable species-specific primers. Methanol extracts for HPLC were prepared from the above-mentioned samples using a procedure previously used for the extraction of phenolic substances from apple pulp [1]. Using this analysis, apple in fruit purees was to be identified using phloridzin as a marker for the presence of the apple component. The result was a successful detection of the apple component in both commercial products and model mixtures using qPCR. However, the tested method of phenolic substance extraction proved to be unsuitable for use in the analysis of fruit purees, as phloridzin was not detected either in the apple puree extract or in the model mixtures to which this puree was added.
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Detection of undeclared fruit species in foodstuffs using methods of molecular biology and instrumental methods
Svobodová, Petra ; Wikarská, Monika (referee) ; Fialová, Lenka (advisor)
This thesis is focused on the detection of apple component in fruit-based baby food. The theoretical part deals with the fruit itself – the apple; food adulteration as a reason for the control of food composition and methods, both instrumental and those of molecular biology, by which food adulteration can be detected. In the experimental part, commercial products containing apple puree were purchased and model mixtures were prepared as replicas of the purchased products. DNA was isolated from these samples, its amplifiability was verified, and the presence of the apple component was detected after the selection of suitable species-specific primers. Methanol extracts for HPLC were prepared from the above-mentioned samples using a procedure previously used for the extraction of phenolic substances from apple pulp [1]. Using this analysis, apple in fruit purees was to be identified using phloridzin as a marker for the presence of the apple component. The result was a successful detection of the apple component in both commercial products and model mixtures using qPCR. However, the tested method of phenolic substance extraction proved to be unsuitable for use in the analysis of fruit purees, as phloridzin was not detected either in the apple puree extract or in the model mixtures to which this puree was added.
|
|
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Identification of probiotic bacteria with the use of PCR from plant frementation diary products
Kuljovská, Tereza ; Langová, Denisa (referee) ; Smetana, Jan (advisor)
Probiotics are encountered daily, either by targeted application of dietary supplements containing live cultures of lactic acid bacteria or by consuming traditional fermented products including dairy or non-dairy products. These cultures can significantly affect intestinal microbiota, particularly during digestive discomfort or problems associated with diarrheal diseases or infectious gastritis. This work focuses on the isolation of probiotics from fermented plant-based products that are also suitable for vegetarians and vegans, whose numbers are currently increasing. In addition to traditional lacto-fermented foodstuffs, there is another alternative in the form of Kombucha. Probiotic bacteria isolated from real samples were subjected to polymerase chain reaction (PCR) to identify them. Presence of the Bacteria domain was detected, and with more specific amplification, the presence of the genus Lactobacillus was detected too, using the specific primers. The amplification resulted in individual fragments were visualized by agarose gel electrophoresis.
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