Age- induced Changes in Some Properties of Plasticized Soybean Protein Concentrate Films Obtained by Casting and Compression Molding

E.M. CIANNAMEA; M.L. GRANADOS; L.M. NEIRA; J.F. MARTUCCI; P.M. STEFANI; R. A. RUSECKAITE

Simposio; Third International Symposium Frontiers in Polymer Science; 2013

Ageing of soybean protein concentrate (SPC) plasticized different amounts of glycerol (Gly) and processed by casting from film forming solution at pH 10 and by intensive mixing followed by compression molding was studied over a period of 120 days. Changes on optical, water resitance, oxygen transmission rate (OTR), water vapor permeability (WVP) and tensile properties of films during ageing were analyzed. All films lost mass continuously during the entire ageing period due to leaching of glycerol as revealed by infrared spectroscopy. The largest changes was observed in casting films with 50%Gly which enhanced the mobility of the protein chains