Nonthermal Pasteurization of Fermented Green Table Olives by means of High Hydrostatic Pressure Processing

Green fermented olives cv. Halkidiki were subjected to different treatments of high hydrostatic pressure (HHP) processing (400, 450, and 500 MPa for 15 or 30 min). Total viable counts, lactic acid bacteria and yeasts/moulds, and the physicochemical characteristics of the product (pH, colour, and fir...

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Bibliographic Details
Published in:BioMed research international 2014-01, Vol.2014 (2014), p.1-9
Main Authors: Argyri, Anthoula A., Panagou, Efstathios Z., Nychas, George-John E., Tassou, Chrysoula C.
Format: Article
Language:English
Subjects:
Fermentation
Food
Food quality
Food research
Food Storage
Hydrostatic Pressure
Microbiota
Microorganisms
Olea
Olea - microbiology
Olea - physiology
Olive
Olives
Pasteurization
Pasteurization - methods
Pigments, Biological - physiology
Polyethylene
Production processes
Temperature
Time Factors
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Summary:Green fermented olives cv. Halkidiki were subjected to different treatments of high hydrostatic pressure (HHP) processing (400, 450, and 500 MPa for 15 or 30 min). Total viable counts, lactic acid bacteria and yeasts/moulds, and the physicochemical characteristics of the product (pH, colour, and firmness) were monitored right after the treatment and after 7 days of storage at 20°C to allow for recovery of injured cells. The treatments at 400 MPa for 15 and 30 min, 450 MPa for 15 and 30 min, and 500 MPa for 15 min were found insufficient as a recovery of the microbiota was observed. The treatment at 500 MPa for 30 min was effective in reducing the olive microbiota below the detection limit of the enumeration method after the treatment and after 1 week of storage and was chosen as being more appropriate for storing olives for an extended time period (5 months). After 5 months of storage at 20°C, no microbiota was detected in treated samples, while significant changes for both HHP treated and untreated olives were observed for colour parameters only (minor degradation). In conclusion, HHP treatment may introduce a reliable nonthermal pasteurization method to extend the microbiological shelf-life of fermented table olives.
ISSN:2314-6133
2314-6141
DOI:10.1155/2014/515623