Isolation And Molecular Characterization Of Lactic Acid Bacteria From Raw Milk
Çetin, Ali Emrah.

Isolation And Molecular Characterization Of Lactic Acid Bacteria From Raw Milk

Çetin, Ali Emrah.

Yazar Ek Girişi
Çetin, Ali Emrah.

Yayın Bilgileri
[s.l.]: [s.n.], 2002.

Fiziksel Tanımlama
viii, 91 leaves.: ill.+ 1 computer laser optical disc.

Lactic 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.

Konu Başlığı
Lactic acid bacteria.
Biotechnological microorganisms -- Isolation.
Milk -- Microbiology.

Yazar Ek Girişi
Yenidünya, Ali Fazıl

Tüzel Kişi Ek Girişi
İzmir Institute of Technology. Biotechnology and Bioengineering.

Tek Biçim Eser Adı
Thesis (master)--İzmir Institute of Technology: Biotechnology and Bioengineering.
İzmir Institute of Technology: Biotechnology and Bioengineering--Thesis (Master).

Elektronik Erişim
Access to Electronic Version.

LibraryMateryal TürüDemirbaş NumarasıYer NumarasıDurumu/İade Tarihi
IYTE LibraryTezT000140QR121.C48 2002Tez Koleksiyonu