In the next step, the combined effect of supplementation
with N and P was accessed. As shown on Fig. 4, supplementing
the DOR40 extract with N and P sources led to an increase on
the BC production between 21.48% (N8 P4, 5) and 43.21% (N1
P8) when compared with no supplementation. However, these
production increment results were far below from those obtained
with separate N or P supplementation.
Moreover, the addition of the HS medium components,
except glucose as the sugar source, to the DOR40 extract
revealed a 58% increase in BC production, up to 1.28 ' 0.06 g L"1
.
These results further confirmed the importance of such components
on BC production [3]. However, this increase was not
such higher than those obtained with the essays supplemented
with N and P sources, to justify the use of HS components
instead of individual N and P supplementations.