Figure 9.7 Effect of water activity on
the transesterification reaction rate for
free cutinase used as freeze-dried
powder at 70°C. The residual
activities after 24 h of continuous use
at the x value of aw, and measured at
the optimal water activity determined
by the filled circles (aw=0.6) are
plotted ( ). On the same graph are
plotted the sorption isotherms
determined at 30°C. 1 mg of
enzyme is placed in the bioreactor.
Solid/gas systems, theory and applications 275