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    Wettability of gelatin-based films: The effects of hydrophilic or hydrophobic plasticizers and nanoparticle loads

    Year: 2021

    Journal: J. Food Eng., Volume 297, MAY

    Authors: Pulla-Huillca, Palmer Vicente; Gomes, Andresa; Quinta Barbosa Bittante, Ana Monica; Lourenco, Rodrigo Vinicius; do Amaral Sobral, Paulo Jose

    Organizations: Sao Paulo State Research Foundation (FAPESP) [2013/07914-81, 2019/26348-0]; Brazilian National Council for Scientific and Technological Development (CNPq) [30.0799/2013-6]; Ministerio de Educacion del Peru; program Programa Nacional de Becas y Credito Educativo (PRONABEC)

    Keywords: Edible films; Glycerol; Acetyl tributyl citrate; Montmorillonite; Water contact angle; Surface tension

    The effects on surface properties of films with compositions based on gelatin plasticized with glycerol, without or with montmorillonite (MMT), and plasticized with acetyl tributyl citrate (ATC) was investigated. The water contact angle (WCA), wettability and free surface energy were determined by measuring the WCA using the sessile drop method. The surface topography was measured by AFM. The film plasticized by glycerol presented the smoothest surface, while the film loaded with MMT presented the greatest surface roughness followed by that plasticized by ATC. All films showed a hydrophobic character (WCA>65 degrees), and the same trend was observed for wettability. It is worth mentioning that there was no significant correlation between the values of WAC and roughness. The films showed low polar component values, which corroborate the high WCA values obtained. In conclusion, the MMT load or the use of ATC did not expressively improve the humidity resistance of films based on gelatin.
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