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dc.contributor.advisorKorel, Figenen
dc.contributor.authorOrşahin, Handeen
dc.date.accessioned2014-07-22T13:51:01Z
dc.date.available2014-07-22T13:51:01Z
dc.date.issued2012en
dc.identifier.urihttp://hdl.handle.net/11147/3168
dc.descriptionThesis (Master)--Izmir Institute of Technology, Biotechnology, Izmir, 2012en
dc.descriptionIncludes bibliographical references (leaves: 74-79)en
dc.descriptionText in English; Abstract: Turkish and Englishen
dc.descriptionxi, 102 leavesen
dc.descriptionFull text release delayed at author's request until 2015.02.13en
dc.description.abstractIn this study, forty Armola cheese samples were collected from dairies located in Seferihisar, İzmir and their physicochemical, microbiological and sensorial quality characteristics were investigated. In addition, the lactic acid bacteria flora of cheese samples was identified using genotyping method (16S-rRNA gene sequencing). The average total solid, fat, and protein contents, pH value, titratable acidity, water activity and salt content of these samples were found as 37.26, 19.52, 10.87, 4.70, 0.95, 0.91, and 2.51, respectively. The average microbial counts were found as follows: Total aerobic mesophilic bacteria, 7.82; psychrotrophic bacteria, 6.98; coliform bacteria, 4.56; lactococci, 7.55; lactobacilli, 7.87; enterococci, 6.17; yeast 7.33; mold <1.00; Staphylococcus spp., 5.94; and Listeria spp., 2.94 cfu/g. The high microbial counts showed that most of these samples were produced in very poor hygienic conditions. As a result of the descriptive sensory analysis, dominant flavor were salty and sour as basic taste; however, creamy, cooked and whey tastes were as aromatics. According to genotyping identification results, the dominant bacteria were found as Enterococcus ratti, Enterococcus durans, Enterococcus hirae, Streptococcus lutetiensis, Streptococcus equines, Streptococcus luteciae, Lactobacillus paracasei subsp. tolerans, Lactobacillus casei subsp. casei, Lactobacillus zeae, and Lactobacillus paracasei subsp. paracasei. Due to the short shelf-life of Armola cheese, antimicrobials, Nisaplin®, Natamax®, and Microgard TM 100, were also used alone or in combination to extend the shelf-life of the product. Microbiological, sensory, color and pH analyses were conducted during storage. Because of the inhibition effects on yeasts, Natamax® and its combinations were the most effective on extending the shelf-life.en
dc.language.isoengen
dc.publisherIzmir Institute of Technologyen
dc.rightsinfo:eu-repo/semantics/embargoedAccessen_US
dc.subject.lcshCheese--Microbiologyen
dc.subject.lcshCheese--Analysisen
dc.subject.lcshFood--Shelf-life datingen
dc.titleQuality characteristics and shelf-life of 'Armola' cheeseen
dc.typemasterThesisen
dc.contributor.departmentIzmir Institute of Technology. Biotechnology and Bioengineeringen
dc.relation.publicationcategoryTezen_US


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