In this study, the lignocellulosic fraction of SFM has not been
exploited, which means that the proposed biorefinery concept
could be further expanded. However, the utilization of C5 and C6
sugars for PHB production will require the use of a microorganism,
such as Burkholderia sacchari (Cesario et al., 2014), that can
consume all or at least most of these sugars. It should be stressed
that the production of biofuels, biopolymers and chemicals should
rely on the utilization of resources that are not used primarily for
food consumption as this leads to significant ethical issues. Furthermore,
cellulose could be used for the production of levulinic acid
as precursor for the production P(3HB-co-3HV), as was reported
by Kachrimanidou et al. (2014)in the case of commercial levulinic
acid.