Overall, the better growth performance of yeast cells during
SSF of autoclave sterile OP as compared to that on the non-sterile
matrix shown here stresses the need limonene to be reduced prior
to fermenting the peel waste using S. cerevisiae. In this direction,
steam explosion has been also proposed as an effective pretreatment
for citrus peel waste to remove d-limonene for subsequent
enzymatic hydrolysis and sugar fermentation for making ethanol
[29,35], anaerobic digestion for methane production [36] and the
successful production of succinic acid [37]. Thus, in the next part of
our study, autoclave sterile OP was used as a substrate to examine
the ability of this strain to synthesize flavour-active compounds via
SSF under microbially controlled environment.