02157naa a2200349 a 450000100080000000500110000800800410001902400270006010000180008724500790010526000090018452011620019365000190135565000190137465000150139365000140140865000140142265300230143665300240145965300180148365300250150165300270152665300120155365300160156570000320158170000170161370000210163070000230165170000220167470000250169677300860172120840742018-01-17       2017    bl uuuu     u00u1 u    #d7 a10.1002/jsfa.83272DOI1 aSANTOS, T. M.  aZein films with unoxidized or oxidized tannic acid.h[electronic resource]  c2017  aCorn zein is apredominatlyhydrophobicprotein, formingfilmswith relativelygoodwater resistance.Tannic acid, especially in its oxidized form, is supposed to cross-link proteins including zein, which may be explored to further enhance the water resistance of zein films. The effects of different contents (0-8 wt%) of unoxidized and oxidized tannic acid (uTA and oTA, respectively) on the properties of zein films at different pH values (4-9) were studied, according to central composite designs. Increasing tannic acid contents and pH values resulted in decreased water solubility and increased tensile strength andmodulus of films. The presence of tannic acid provided the films with a yellowish color and increased opacity. Paired t-tests indicated that oTA films presented higher tensile strength, lower water vapor permeability and lower water solubility than uTA films. Higher tannic acid contents and pH values resulted in films with better overall physical properties, which might be ascribed to cross-linking, although the films were still not water resistant. The resulting films have potential to be used for food packaging and coating applications.  aPhenolic acids  aÁcido tânico  aCruzamento  aProteína  aRetículo  aÁcidos fenólicos  aBiodegradable films  aCross-linking  aFilme biodegradável  aFilmes biodegradáveis  aProtein  aTannic acid1 aSOUZA FILHO, M. de S. M. de1 aMUNIZ, C. R.1 aMORAIS, J. P. S.1 aKOTZEBUE, L. R. V.1 aPEREIRA, A. L. S.1 aAZEREDO, H. M. C. de  tJournal of the Science of Food and Agriculturegv. 97, n. 13, p. 4580-4587, 2017.