Single-cell protein production of Candida strains in culture media based on vegetal oils

The aim of this study was to assess the potential of valorisation of a vegetal fatty material by fermentations carried out by novel Candida yeast strains in order to produce single-cell protein. The yeasts were grown on sunflower oil as sole carbon source. The study was performed in a batch system. Satisfactory quantities of biomass were produced when yeasts were grown in conical flasks (biomass yield 1.04 1.16 g of total biomass produced per g of fat consumed). In bioreactor trials, in which higher agitation and aeration conditions were applied compared with the equivalent trial in the flasks, significantly higher quantities of biomass were produced (biomass yield of 1.4 1.52 g of total biomass produced per g of fat consumed). In bioreactor trials the transformation yields of fat into single-cell protein was 71.25 76.35% (g of total biomass produced / 100 g of total initial fat), higher than the yield 43.9548.2% registered for flasks trials. The results of this study suggest that SCP as a biotechnologically valuable product could be produced using renewable low-cost substrates such as vegetal oils in one procedure with the fat cleaning of fermentation medium.

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