Evolution of safety and other quality parameters of the Greek PDO table olives ‘Prasines Elies Chalkidikis’ during industrial scale processing and storage

Abstract

The evolution of safety and other quality parameters of the Greek green table olives PDO 'Prasines Elies Chalkidikis' that are prepared according to the Spanish style processing was examined systematically at industrial scale and 12 month storage for two consecutive periods for the first time. Evolution of safety parameters (bacteria/yeasts, pH, acidity) during fermentation in brine and on olives upon storage, changes in olive color and texture during storage and the fate of characteristic hydrophilic and hydrophobic antioxidants (oleuropein, ligstroside and related compounds, ****tocopherol, squalene and sodium content were monitored using appropriate methods. Sensory scores were also provided in certain cases. Findings supported that the final product is microbiologically safe and except of trade quality parameters that were satisfied, attention should be paid to the reduction in phenolic compounds (hydroxytyrosol, tyrosol) content and the important increase in sodium content due to fermentation and storage in brine. This prototype model study indicates loopholes in the efforts to establish table olives as a functional food.

Practical applications: Industry has to compromise legal safety and nutritional aspects with traditional processing and storage conditions that are applied in PDO table olive production, considering also intrinsic cultivar characteristics of the drupes. Policy makers, regulatory bodies, IOC, and the industry may profit from the substantiation provided by the results of this two year study

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