Selection of yeasts as starter cultures for table olives

J Food Sci. 2013 May;78(5):M742-51. doi: 10.1111/1750-3841.12117. Epub 2013 Apr 9.

Abstract

Ninety-nine yeasts were isolated from Bella di Cerignola table olives; first, the strains were studied in relation to their ability to produce biogenic amines in a laboratory medium and 49 strains were positive to this assay and cut off from the research. The remaining 50 strains were characterized for their enzymatic traits (β-glucosidase, catalase, pectolytic, xylanolytic, and lipolytic activities) and for their ability to grow at different temperatures, pHs, with salt or lactic/acetic acids added. Data were used for the evaluation of growth index and submitted to cluster and principal component analyses to choose the most promising 4 strains. In the final step of the research, the strains were inoculated as a cocktail in a model brine, containing different amounts of salt (4% to 12%) and glucose (0% to 3%), and adjusted to different pHs (4.0 to 9.0). Data analysis through a multiple regression procedure highlighted that salt, glucose, and pH acted in a different way within the storage and NaCl affected yeast growth only for few days, and then glucose and pH played a major role.

MeSH terms

  • Biogenic Amines / analysis*
  • Colony Count, Microbial
  • Fermentation
  • Food Microbiology*
  • Hydrogen-Ion Concentration
  • Hydrolysis
  • Italy
  • Multivariate Analysis
  • Olea / microbiology*
  • Polymorphism, Restriction Fragment Length
  • Reproducibility of Results
  • Salts / analysis
  • Temperature
  • Yeasts / classification
  • Yeasts / enzymology
  • Yeasts / growth & development
  • Yeasts / isolation & purification*

Substances

  • Biogenic Amines
  • Salts
  • brine