3. Results and Discussion
The films made from pectin and alginate showed up with a slightly yellowish color, translucent and
homogeneous surface.
Through the microscopic images of composite films for different concentrations of crosslinker solution,
shown in Figure 1, we can observe that the films presented a matrix filmogenic continuous and compact.
This behavior demonstrates the chemical compatibility of the two polysaccharides.
The films formulated from a crosslinker solution containing 3 % CaCl2 (w/v) and 5 % glycerol (v/v)
originated the surface more uniform among all the treatments. Having, thus, the total incorporation of
crosslinking agents and plasticizers to filmogenic matrix.
For films prepared with 7 % CaCl2 (w/v) is possible to observe the initiation of the formation of small
granules of calcium on the surface of the film, evidence that for crosslinking concentrations higher than this
may be a saturation limit of the absorption of ions in the film.
When we analyzed the images under varying concentration of glycerol is possible to note that the increase
of this factor produces films rougher surface. With this, they become more flexible and consequently less
resistant to tension, in addition to having greater permeability to water vapor since its display area
becomes relatively greater.