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dc.contributor.advisorYenidünya, A.Fazilen
dc.contributor.authorÇetin, Ali Emrahen
dc.date.accessioned2014-07-22T13:52:11Z
dc.date.available2014-07-22T13:52:11Z
dc.date.issued2002en
dc.identifier.urihttp://hdl.handle.net/11147/3705
dc.descriptionThesis (Master)--Izmir Institute of Technology, Biotechnology, Izmir, 2002en
dc.descriptionIncludes bibliographical references (leaves: 84-91)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionviii, 91 leavesen
dc.description.abstractLactic acid bacteria are industrially important because they are used as starter cultures in food production, they produce antimicrobial compounds and they are used in the formulation of probiotic products. Several dairy products such as raw milk, traditionally fermented cheese (produced without the use of commercial starter cultures), and kefir which are produced in country are good sources of novel lactic acid bacterial strains. These lactic acid bacterial strains may have potential for the production of new fermented dairy products with characteristic aroma and flavour. Therefore, the isolation of lactic acid bacteria from natural products and their identification are important. For many years, several phenotypic methods have been used to identify lactic acid bacteria, but they are not often capable of effectively differentiating subspecies and strains within a genus. New methods based on the genotypic properties have been developed and used for the proper classification of bacteria The aim of this research was the isolation of lactic acid bacteria from raw milk and the identification of the lactic acid bacterial isolates by biochemical tests, polymerase chain reaction (PCR)-based methods and pulsed field gel electrophoresis (PFGE). Lactic acid bacteria were isolated from cow.s raw milk and identified by biochemical reactions. Two PCR based methods, ITS-PCR (Internal Transcribed Spacer-PCR) and PCR-RFLP (PCR- Restriction Fragment Length Polymorphism) were then used for the differentiation of reference strains of lactic acid bacteria. PCR-RFLP method, based on the amplification and restriction digestion of 16S rRNA gene, was found to be useful for the identification. Thirteen raw milk isolates were identified as Lactococcus lactis, 24 as Enterococcus spp., and 2 as Lactococcus lactis subsp. cremoris by PCR-RFLP method. Pulsed field gel electrophoresis was also optimized for the identification of reference strains. Restriction profiles obtained by digesting the genomic DNA with Sma I enabled differentiation of the reference strains of Lactococcus, Enterococcus, and Streptococus thermophilus.en
dc.language.isoeng
dc.publisherIzmir Institute of Technologyen
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject.lccQR121. C48 2002en
dc.subject.lcshLactic acid bacteriaen
dc.subject.lcshBiotechnological microorganisms--Isolationen
dc.subject.lcshMilk--Microbiologyen
dc.titleIsolation and molecular characterization of lactic acid bacteria from raw milken
dc.typemasterThesisen
dc.contributor.authorIDTR24129
dc.contributor.departmentIzmir Institute of Technology. Biotechnology and Bioengineeringen
dc.relation.publicationcategoryTezen_US


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