Heat Treatment To Modify the Structural and Physical Properties of

RIVERO, S.; GARCIA, M.A.; PINOTTI, A.

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

AMER CHEMICAL SOC

Lugar: Washington; Año: 2012 vol. 60 p. 492 - 499

0021-8561

This work was focused on studying the changes undergone by heat-treated chitosan films with and without tannicacid addition by monitoring both microstructure and physical properties. Once the films were submitted to different heattreatments, they exhibited higher barrier properties as well as lower water uptake, solubility, and moisture content. These resultswere also confirmed through X-ray patterns, which changed from the hydrated to the anhydrous conformation, sharper FTIRpeaks specifically associated with water, and shift of Tg toward higher temperatures determined by DMA. Moreover, themodifications caused by the curing process at a molecular scale were observed at a structural level by using a TEM technique.FTIR evaluation granted new insights into the interactions between tannic acid and chitosan molecules, before and after the heatcuring, especially due to the occurrence of new peaks and changes in the wavenumber region 1550−1750 cm−1.