4. Conclusions
The results of this study point out for the first time the feasibility
of SSF of OP waste for the production of yeast volatile esters with
“fruity-like” character and of high industrial importance. Compared
to previous results obtained in SmF of orange peel hydrolysate, the
SSF proved to be very adaptable and did not need any treatment
besides sterilization. During SSF the yeast showed good growth
performance and increased ability to consume the available nutrients
and remain alive over the whole fermentation process. SSF
also ensured high yields of volatile aroma esters (total concentration
of 250 mg/kg of fermented OP). Our findings seem encouraging
towards the direction of scale up in bioreactors that should be carried
out together with respective provision of process economics.