Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/3168
Title: Quality characteristics and shelf-life of 'Armola' cheese
Authors: Korel, Figen
Orşahin, Hande
Issue Date: 2012
Publisher: Izmir Institute of Technology
Abstract: In 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.
Description: Thesis (Master)--Izmir Institute of Technology, Biotechnology, Izmir, 2012
Includes bibliographical references (leaves: 74-79)
Text in English; Abstract: Turkish and English
xi, 102 leaves
Full text release delayed at author's request until 2015.02.13
URI: http://hdl.handle.net/11147/3168
Appears in Collections:Master Degree / Yüksek Lisans Tezleri

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