The best enzyme concentration and incubation
time determined was used to produce the feed for
spray drying. The aqueous extract of pineapple puree
was mixed with 30% w/w maltodextrin at a ratio of
1:1. The aspirator rate, pump rate, air flow rotameter
and the pneumatic nozzle cleaner speed of the spray
dryer (Model B-290, Büchi, Switzerland) were kept
constant at 100%, 20%, 40 mm and 6, respectively.
The spray drying process was first optimized using
different inlet temperatures from 150-180°C at an
interval of 10°C. The procedure was then repeated by
using different concentrations of maltodextrin, 15-
30% w/w (interval of 5% w/w) at the fixed optimised
inlet temperature.