Characteristics of soy protein isolate‐montmorillonite composite films

Abstract

Soy protein isolate/montmorillonite (SPI/ MMT) nanocomposite films were prepared in which MMT was used as a nanofiller at 0, 3, 6, 9, 12, and 15 wt % relative to SPI dry weight. Effects of MMT on film properties including tensile strength, elongation at break, total soluble matter, water vapor permeability, and oxygen permeability were assessed. X-ray diffraction patterns were determined, and morphologies of SPI and the SPI-MMT composite films were visualized by scanning electron microscopy. Mechanical and barrier properties were improved by evidenced increases in tensile strength and modulus, and decreases in permeability to water vapor and oxygen. MMT concentrations of 3%-12% were optimal for improving functional properties of the composite films. X-ray diffraction and scanning electron microscopy examinations revealed the formation of an intercalated and exfoliated structure on the addition of MMT into the SPI matrix. We conclude that intercalated and exfoliated MMT silicates enhance mechanical and barrier properties of SPI films.

Properties of soy protein isolate/nano‐silica films and their applications in the preservation of Flammulina velutipes

“…Figure d shows a smoother surface and cross‐section morphology for the film with 6% nano‐SiO 2 compared to the other films, consistent with the properties of the SPI/nano‐SiO 2 composite films. Similar observations were seen in studies by Xu, Zhang, Lv, et al () and Lee and Kim (), supporting our results.…”

Transglutaminase cross-linking to enhance elastic properties of soy protein hydrogels with intercalated montmorillonite nanoclay

“…Proteins with good film-forming properties, such as soy protein (SP), wheat gluten, pea protein, and gelatin, have been used as matrix biopolymers, and the mechanical and barrier properties of films are much improved after incorporating nanoclays such as montmorillonite (MMT) (Arora and Padua, 2010;Chang et al, 2009;Chen and Zhang, 2006;Guilherme et al, 2010;Kumar et al, 2010a,b;Lee and Kim, 2010;Martucci and Ruseckaite, 2010). However, properties of these bio-nanocomposites, e.g., poor moisture barrier properties resulting from the hydrophilic nature of many proteins, still require substantial improvement to compete with petrochemicalbased plastics (Kumar et al, 2010a).…”

Rice bran protein-based films enriched by phenolic extract of fermented rice bran and montmorillonite clay

“…Tunç and Duman (2010) developed CyTA -Journal of Food 5 gluten-based films with the addition of MMT and highlighted that the presence of MMT induced reduction of the water sensitivity of the films. Lee and Kim (2010) developed composite films of soy protein isolate and MMT and obtained better mechanical and permeability properties when compared with films without MMT. The addition of MMT to the films negatively affected (p < 0.05) mechanical properties (Table 4), once higher values of TS (8.6 MPa) were obtained without the addition of MMT and for lower glycerol concentrations (Figure 1d).…”