info:eu-repo/semantics/article
Impact of gum arabic and sodium alginate and their interactions with whey protein aggregates on bio-based films characteristics
Fecha
2019-03-15Registro en:
Erben, Melina; Pérez, Adrián A.; Osella, Carlos Alberto; Alvarez, Vera Alejandra; Santiago, Liliana Gabriela; Impact of gum arabic and sodium alginate and their interactions with whey protein aggregates on bio-based films characteristics; Elsevier Science; International Journal of Biological Macromolecules; 125; 15-3-2019; 999-1007
0141-8130
CONICET Digital
CONICET
Autor
Erben, Melina
Pérez, Adrián A.
Osella, Carlos Alberto
Alvarez, Vera Alejandra
Santiago, Liliana Gabriela
Resumen
Two polysaccharides (PS), gum arabic (GA) and sodium alginate (SA), and whey protein concentrate (WPC) were used to design bio-based films at two ratios (RPS:WPC 1:2 and 1:3). The effects of PS, RPS:WPC and WPC thermal treatment (unheated vs. aggregate) were determined on films characteristics. Film-forming dispersions were tested using different complementary techniques: UV-Vis spectroscopy, electrophoretic mobility, bulk rheology and confocal microscopy. PS exhibited weak associations with proteins. However, this behavior was more significative in SA/WPC systems. Rheological and optical characteristics of filmogenic suspensions were influenced by PS, RPS:WPC and WPC heat treatment. Apparent viscosity values for SA/WPC systems were 80-250 times higher than the ones obtained for GA/WPC systems. Furthermore, thickness, moisture absorption, contact angle and mechanical properties were also affected by the film design factors. GA/WPC-aggregates films showed lesser moisture absorption; however, they have higher surface polarity than those made with SA/WPC-aggregates. Moreover, SA/WPC-aggregates systems provided stronger films in comparison with the GA/WPC-aggregates ones. In addition, mechanical properties were also affected by RPS:WPC and WPC treatment. It was observed that denatured WPC and 1:3 RPS:WPC produced weaker mechanical features. Results provide useful information for the design of bio-based mixed films with tailor-made properties.