Influence of process (extrusion/thermo-compression, casting) and lentil protein content on physicochemical properties of starch films

OCHOA-YEPES, OSWALDO; MAURI, ADRIANA; DI GIOGIO, LUCIANA; FAMÁ, LUCÍA; DI GIOGIO, LUCIANA; FAMÁ, LUCÍA; GOYANES, SILVIA; GOYANES, SILVIA; OCHOA-YEPES, OSWALDO; MAURI, ADRIANA

CARBOHYDRATE POLYMERS

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2019 vol. 208 p. 221 - 231

0144-8617

Starch films often present high water sensitivity, affecting their barrier and mechanical properties. The effects ofprocessing technique, extrusion/thermo-compression and casting, and lentil protein concentration (0, 0.75 wt.%and 1.5 wt.%) on biodegradable starch films were investigated. Extrusion/thermo-compression process increasedin 90% the mechanical resistance of starch films produced following the casting methodology and decreasedtheir moisture content, water solubility and water vapor permeability in 35%, 23%, and 50%, respectively. Inthe presence of the protein, the mechanical properties (Young modulus and stress at break) and the watertolerance improved due to the crosslinking phenomenon prompted between the protein and the polymericbackbone, being these effects more pronounced on the extruded formulations. All samples resulted thermalstable until 240 °C and biodegraded in compost in 5 weeks. This work revealed that extrusion/thermo-compressionprocess and proteins as crosslinking of starch are two alternatives to improve the drawbacks of starchbasedmaterials.