title: A comparison for acid production, proteolysis, autolysis and inhibitory properties of lactic acid bacteria from fresh and mature Feta PDO Greek cheese, made at three different mountainous areas.
abstract: Isolates of NSLAB were obtained from fresh (58 isolates) and mature (38) Feta cheese made at household level in three different mountainous areas, in order to study the effect of the area of production on NSLAB composition and their technological characteristics. Results obtained by SDS-PAGE of whole-cell proteins indicated that the microflora of the fresh cheese was composed of either lactococci (areas 1, 2), or lactococci and enterococci (area 3). The NSLAB microflora of mature cheese was composed almost entirely of lactobacilli species, differing according to the area of production. Species allocation by the SDS-PAGE method was confirmed by sequencing representative strains. Lactococci of cheese made in area 1 exhibited a narrow spectrum of antibacterial activity compared to isolates from areas 2 and 3, while for lactobacilli from all three areas a similar spectrum was noticed. Lactococci from area 2 exhibited higher (P<0.05) mean acidifying activity than lactococci from area 1. The isolates from the three areas also differed in respect of their caseinolytic activity, with preferences towards β-CN (areas 1 and 2) or αs-CN (area 3). Mean proteolytic activity of lactococci from area 1 was stronger (P<0.05) than that of lactococci from area 2 and the same was observed for their mean aminopeptidase activity, as well as their extent of autolysis at pH5.1. Mean acidifying activity of lactobacilli after 6h was for strains of area 3>2=1. The strains from areas 1 and 3 degraded preferentially αs-CN, while a clear preference towards β-CN was noticed for strains of area 2; their mean proteolytic activity was for strains of area 1 higher (P<0.05) than strains from area 3. The above results suggest that cheeses from the three areas differ in species composition of NSLAB and their technological properties. Principal component analysis of results on acidifying and proteolytic activities as well as autolysis allowed the distinction of lactococci according to their derivation area enabling the selection of appropriate strains as starters for cheese production in each area.
authors.affiliation: Laboratory of Food Microbiology and Hygiene, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece.
authors.forename: Despina
authors.initials: D
authors.lastname: Bozoudi
authors.affiliation: Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, 54124 Thessaloniki Greece.
authors.forename: Charalambos
authors.initials: C
authors.lastname: Kotzamanidis
authors.affiliation: Laboratory of Food Microbiology and Hygiene, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece.
authors.forename: Magdalini
authors.initials: M
authors.lastname: Hatzikamari
authors.affiliation: Laboratory of Food Microbiology and Hygiene, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Tzanetakis
authors.affiliation: Laboratory of Agronomy, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: George
authors.initials: G
authors.lastname: Menexes
authors.affiliation: Laboratory of Food Microbiology and Hygiene, Faculty of Agriculture, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece. Electronic address: ganet@agro.auth.gr.
authors.forename: Evanthia
authors.initials: E
authors.lastname: Litopoulou-Tzanetaki
mesh_terms: D001329:Autolysis; D002611:Cheese / Q000382:microbiology*; D004591:Electrophoresis, Polyacrylamide Gel; D005516:Food Microbiology; D006115:Greece; D019344:Lactic Acid / Q000378:metabolism; D007777:Lactobacillaceae / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology*; D017045:Lactococcus / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism / Q000502:physiology*; D059748:Proteolysis
chemical_list: D019344:Lactic Acid
keywords: Feta cheese; NSLAB; PCA; SDS-PAGE; Species-specific PCR; Technological properties