Free
films
were
obtained
by
the
solvent
casting
method
from
retrograded
starch-pectin
dispersions
at
different
polymer
proportions
and
concentrations
with
and
without
plasticizer.
Film
forming
dispersions
were
characterized
according
to
their
hardness,
birefringence
and
rheological
properties.
The
polymer
dispersions
showed
a
predominantly
viscous
behavior
(G>
G)
and
the
absence
of
plasticizers
lead
to
building
of
stronger
structures,
while
the
occurrence
of
Maltese
crosses
in
the
retrograded
dispersions
indicates
the
occurrence
of
a
crystalline
organization.
Analyses
of
the
films
included
mechanical
prop
erties,
thickness,
superficial
and
cross
sectional
morphology,
water
vapor
permeability,
liquid
uptake
ability,
X-ray
diffractometry,
in
vitro
dissolution
and
enzymatic
digestion.
The
high
resistant
starch
con
tent
(65.8–96.8%)
assured
the
resistance
of
materials
against
enzymatic
digestion
by
pancreatin.
Changes
in
the
X-ray
diffraction
patterns
indicated
a
more
organized
and
crystalline
structure
of
free
films
in
relation
to
isolated
polymers.
Increasing
of
pectin
proportion
and
pH
values
favored
the
dissolution
and
liquid
uptake
of
films.
Films
prepared
with
lower
polymer
concentration
presented
better
barrier
function(WVP and mechanical properties).