that of spray-dried bromelain (73 ± 2%). The reason attributed to
these findings is the desired low temperature of the material during
freeze drying which maintains its structure and the morphology
during the process of dewatering. In case of spray drying, the effect
of drying air temperature on the residual enzyme activity was also
studied. Fig. 5 shows that with an increase in inlet air temperature
the residual enzyme activity decreases for a given feed rate
condition. At higher inlet air temperature, the material is exposed
to higher outlet air temperature which causes the denaturation of
the proteins. Therefore, it is desirable to operate the spray dryer at
lower air temperature to get the maximum enzyme activity reten