Use of mesophilic Lactic Acid Bacteria in the manufacture of Feta cheese

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Veröffentlicht: Nov 30, 2017
DOI: https://doi.org/10.12681/jhvms.15081
S. B. KARAGEORGIS (Σ.Β. ΚΑΡΑΓΕΩΡΓΗΣ)
Institute of Food Hygiene of Athens,Ministry of Rural Development and Food
D. K. PAPAGEORGIOU (Δ.Κ. ΠΑΠΑΓΕΩΡΓΙΟΥ)
Laboratory of Milk Hygiene and Technology, Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki
A. I. MANTIS (Α.Ι. ΜΑΝΤΗΣ)
Laboratory of Milk Hygiene and Technology, Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki
S. A. GEORGAKIS (Σ.Α ΓΕΩΡΓΑΚΗΣ)
Laboratory of Milk Hygiene and Technology, Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki
Abstract

The use of mesophilic lactic acid bacteria (LAB) in the manufacture of Feta cheese was studied. Five selected mesophilic strains, confirmed as Lactobacillus plantarum (2 strains), Lb. paracasei subsp. paracasein Lb. brevis and Lactococcus lactis subsp. lactis, isolated from ripened Feta and Teleme cheeses, were used in 7 different combinations, alone or in combination with Lb. delbrueckii subsp. bulgaricus and Streptococcus thermophilus (the control combination) for the manufacture of Feta cheese. Each combination of strains was used to prepare four different batches of Feta cheese, keeping all the other production parameters according to the traditional technology. The cheese batches were analyzed for bacteriological, chemical and sensory characteristics. The results showed that the populations of lactobacilli and lactococci increased from the beginning of the cheese manufacture reaching a population of more than 7.0 log10cfu/g. This level was maintained during the whole ripening period (60 days) and during the subsequent 60-day storage period. Only in batches prepared with the control combination F8 {Str. thermophilus I Lb. delbrueckii subsp. bulgaricus), did the population of LAB decline to 6.0 log10cfu/g at the end of the ripening period. Also, except for the yeast population which increased, in all other bacterial groups tested (coliforms, staphylococci, total contaminating bacteria, psychrotrophic bacteria, proteolytic and lipolytic bacteria) populations gradually decreased during the ripening period. Results of the chemical analysis showed a sharp increase in acidity (the cheese pH dropped to ca. 4.5 within 3-4 d) and, whereas the values of other chemical indices (moisture content, fat content and NaCl) were stabilized between the 15* and 30* day of ripening, proteolysis (nitrogen soluble in 12% TCA) and lipolysis (ADV) progressed throughout ripening. The assessment of the overall acceptance by the sensory panel was between "very good" and "excellent" for all cheeses. This suggests that the selected mesophilic starter cultures can be used alone or in combination with the traditional culture {Lb.delbrueckii subsp. bulgaricus I Str. thermophilus) in the production of Feta cheese, as the results of this work indicate that the wild (autochthonous) strains of Lb. plantarum and Lc. lactis subsp. Lactis are well adapted to the environmental conditions that prevail in Feta cheese. Batches prepared using these mesophilic starters received the highest score in the assessment of organoleptic quality of Feta cheese. Very good results were also obtained using the combination of the mesophilic starters Lb. brevis and Lc. lactis subsp. lactis or Lb. paracasei subsp. paracasei and Lc. lactis subsp. lactis alone or in combination with Lb. delbrueckii subsp. bulgaricus and Str. thermophilus.

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