Efficacy of yeast starters to drive and improve Picual, Manzanilla and Kalamàta table olive fermentation

BACKGROUND: Table olives fermentation is a process unpredictable and frequently performed using traditional practices often inadequate to obtain products with acceptable quality and safety standards. In the present study, the efficacy of selected yeast strains as starters to drive fermentations of green and black table olives by the Greek method was investigated. Pilot-scale production by spontaneous fermentation as a control, olives started with previously selected Saccharomyces cerevisiae strains; fermentation driven by commercial S. cerevisiae baker's yeast strain were carried out for each one of Manzanilla, Picual, and Kalamàta table olives cultivars. RESULTS: Time of fermentation was significantly shortened to 40 days to complete the transformation process for all the three tested cultivars. Inoculated table olives were enhanced in their organoleptic and nutritional properties in comparison with corresponding samples obtained by spontaneous fermentation. The use of starters was also able to improve safety traits of table olives in terms of biogenic amines reduction as well as of absence of undesired microorganisms at the end of the process. CONCLUSIONS: Autochthonous, but also non-authochthonous yeasts can be used to start and control le olives fermentations and can significantly improve quality and safety aspects of table olives produced by many smallholder farmers. This article is protected by copyright