Effect of Wheat and Oat Bran on the Physicochemical Properties of Edible Starch‐Based Films Obtained by Extrusion for Food Packaging Applications

Abstract

Obtaining edible and biodegradable films for food packaging applications has been a strong desire of consumers, scientific community and industry for years. In this context, edible films from cassava starch with wheat or oat bran (0, 5 and 10 wt.%) manufactured from an industrially established process for packaging, such as extrusion technique, are investigated. Wheat bran is found to have a high content of total dietary fiber, being able to provide a nutritional contribution to the packaging and to consumers. Some broken bran grains smaller than 1 µm are observed, distributed quite homogeneously in the matrix and without the presence of phase separation, suggesting great miscibility between the components. Brans acted as reinforcement in concentrations of 10 wt.%, leading in thecase of wheat bran to increases of 850%, 45% and 25% in Young modulus, strength at break and toughness, respectively, and to decreases in moisture content. The incorporation of bran not significant change the thermal stability and biodegradation of the films. This investigation showed that biodegradable and edible cassava starch-based films can be manufactured by a scalable process with possible improvements in nutrition and mechanical strength using 10 wt.% of bran for its potential employ as food packaging.

Effect of TiO2 Nanoparticles and Extrusion Process on the Physicochemical Properties of Biodegradable and Active Cassava Starch Nanocomposites

“…Figure 6 shows the tensile stress ( σ )–strain ( ε ) curves of all films, which exhibit the typical behavior for thermoplastic starch materials [ 57 ]: a linear elastic zone followed by a non-linear elastic zone until failure. The stress at break ( σ b ), strain at break ( ε b ), Young’s modulus (E) and toughness (T) values obtained from the σ - ε curves, as well as the parameters from the theoretical KWW model are shown in Table 3 .…”

A Biodegradable and Active Bilayer Nanocomposite Obtained from Starch‐Yerba Mate Extract and Starch‐TiO2 Nanoparticles Films for Packaging Applications

“…FE‐SEM images ( Figure ) revealed smooth cryo‐fracture surfaces, similar to the morphology observed in thermoplastic starch films that undergo complete starch gelatinization during the manufacturing process. [ 43–45 ] In addition, no pores or cracks were observed.…”

Developing active and intelligent biodegradable packaging from food waste and byproducts: A review of sources, properties, film production methods, and their application in food preservation

“…Specifically, there were increases of 850% in Young's modulus, 45% in strength at break, and 25% in toughness compared to films without wheat bran. (Ochoa‐Yepes et al., 2023).…”