Assessment of the Microbiological Quality and Biochemical Parameters of Traditional Hard Xinotyri Cheese Made from Raw or Pasteurized Goat Milk

Author:

Pappa Eleni C.ORCID,Bontinis Thomas G.,Samelis JohnORCID,Sotirakoglou KyriakiORCID

Abstract

Traditional hard Xinotyri cheese was manufactured using raw or pasteurized goat milk, without starter cultures, and the changes in microbiological and biochemical characteristics were studied during ripening and storage. Mesophilic lactic acid bacteria (LAB) predominated (>8.5 log CFU/g) in freshly fermented Xinotyri cheeses (pH 4.5–4.6), regardless of milk pasteurization. Enterobacteria, pseudomonads and staphylococci were suppressed below 6 and 4–5 log CFU/g in fresh cheeses from raw and pasteurized milk, respectively. Salmonella and Listeria spp. were absent in 25 g cheese samples. Coagulase-positive staphylococci exceeded the 5-log safety threshold in fresh raw milk cheeses, which also had 10-fold higher levels of enterococci than pasteurized milk cheeses. Non-LAB groups declined <100 CFU/g, whereas yeasts increased to 5–6 log CFU/g in both cheeses during ripening. Milk pasteurization affected the protein, fat, ash, moisture, nitrogen fractions, total free fatty acids and total free amino acids content of cheeses. Primary proteolysis, detectable by urea-PAGE, was more intense in raw milk cheeses than in pasteurized milk cheeses. However, the hydrophilic and hydrophobic peptides and their ratio in the water-soluble fraction were similar in both cheeses. Cheeses discriminated clearly according to the milk kind (raw, pasteurized) and the stage of ripening, based on the examined biochemical characteristics.

Funder

Greek Dairy Organization

Publisher

MDPI AG

Subject

Plant Science,Biochemistry, Genetics and Molecular Biology (miscellaneous),Food Science

Reference57 articles.

1. Biochemistry of cheese ripening

2. Possible implications of milk pasteurization on the manufacture and sensory quality of ripened cheese

3. Opinion of the Committee of the Regions on Promoting and Protecting Local Products—A Trump-Card for the Regionshttps://op.europa.eu/en/publication-detail/-/publication/dcd34e04-fce5-4af8-9966-b3d35be2f52d

4. Influence of Ripening on Chemical Characteristics of a Traditional Italian Cheese: Provolone del Monaco

5. The Oxford Companion to Cheese;Donelly,2016

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