be kept in mind when analyzing the functionality of the resulting
materials.
The solubility in water of these films also became progressively
reduced with increasing MMT contents in the formulation, reaching
a value representing only 65% of the solubility of the pureprotein
film with the nanocomposite of 10 g of MMT per 100 g of
SPI. The same effect had been reported by other authors [45–47]
with MMT added to films composed of agar, chitosan, and cottoncarboxymethylcellulose:
they attributed those results to the formation
of hydrogen bonds between the clay and the hydroxyl
groups of those different matrices. After solubility experiments,
the nanocomposite films did not lose their integrity and were
handable, but they just suffered a swelling without getting a gel
state. Otherwise, the soy protein films lost their integrity