PC, also recommended for clarification of apple juice, was used
during the experiments with butia palm fruit. For butia palm juice,
greater clarification was obtained with the experimental prepara-
tion TE1 at 30 C for 60min, whereas inferior results were observed
at 50 C. In this case, the experimental extract performance was
significantly superior in comparison to the commercial product
(Fig. 2B).
Blueberry juice presented an increase of about 40% in levels of
clarification (i.e., a 40 percent decrease in turbidity) when treated
with the experimental extract TE1 with hydrolysis temperature of
50 C for 30 and 60 min and with the commercial product PB at
30 C for 30 min and at 30 and 50 C for 60 min (Fig. 3A). Such
results are superior to those obtained by Landbo andMeyer (2007),
who recorded 30% decrease in turbidity in blueberry juice, with the
addiction of the commercial compound PectinexBe Colour. Grape
juice (Fig. 3B) presented best clarification with the experimental
extract TE1 at 50 C for 30 and 60 min.
It could be verified, through hydrolysis with experimental
enzymatic extracts, that TE2, obtained with A. oryzae in liquid
medium, was not effective in the liquefaction of particles present in
all four juices, at any tested conditions. In general, fruits contain
different insoluble polysaccharides, most commonly pectin, hemi-
cellulose and cellulose, as well as structural proteins and lignin.
Thus, it is possible that the obtained results have been influenced
by other enzymes whose activities have not been determined by
this study. In the case of apple juice, for instance, Dongowski and
Sembries (2001) observed that the composition and activities of