Improvement of water barrier properties of soybean protein isolate films by poly(3‐hydroxybutyrate) thin coating

Abstract

The aim of this work was to study the preparation of bilayer films formed by soy protein isolate (SPI) and polyhydroxybutyrate (PHB). This was done using the lowest possible concentration of PHB to improve the functionality of SPI films as food packaging or for agricultural uses, specially reducing their water

Bilayer Films of Poly(lactic acid) and Cottonseed Protein for Packaging Applications

“…The CSM/glycerol film was found to have a YM of 87 MPa, TS of 2 MPa, and EB of 29%. These results are comparable to the values reported for soy protein by Gonzále and Igarzabal [ 29 ] and Salgado et al [ 32 ]. In both of their papers on soy protein, the films were cast from aqueous solution of protein and glycerol, just like in this work.…”

“…The soy protein films made by Gonzále and Igarzabal contained 20% glycerol and gave a YM of 22.8 MPa; TS of 1.1 MPa; and EB of 25% [ 29 ]. The soy protein films made by Salgado et al contained 33% glycerol and gave a YM of 2.0 MPa; TS of 6.8 MPa; and EB of 54% [ 32 ]. The cottonseed protein film in this work contained 23% glycerol, and the TS and EB values are intermediate between the values reported by Gonzále and Igarzabal [ 29 ] and Salgado et al [ 32 ].…”

“…The soy protein films made by Salgado et al contained 33% glycerol and gave a YM of 2.0 MPa; TS of 6.8 MPa; and EB of 54% [ 32 ]. The cottonseed protein film in this work contained 23% glycerol, and the TS and EB values are intermediate between the values reported by Gonzále and Igarzabal [ 29 ] and Salgado et al [ 32 ]. However, the value for YM obtained in this work is somewhat higher than the soy protein films of both Gonzále and Igarzabal [ 29 ] and Salgado et al [ 32 ].…”

“…The CSM films were prepared by the “casting” method adapted from previous publications [ 29 , 32 , 33 ]. For each film, 1 g CSM and 0.3 g glycerol were added into 20 mL distilled water.…”

D-Limonen ve Nanoselüloz İçeren Aktif Kitosan/Polikaprolakton İki Katmanlı Filmler

“…Bu durum, bir fenolik bileşen olan DL'nin daha fazla ışık absorbe edebilir özellikte olmasından kaynaklanabilir [41]. İki katmanlı filmlerde gözlenen opaklık artışının bir diğer nedeni de ara yüzde oluşan boşluklar olabilir [37]. Sonuç olarak, CH filmlere DL ilave edilmesi, DL'nin CH matrisi ile daha az etkileşime girerek CH filmlerin daha kalın olmasına ve dolayısıyla opaklık değerleri daha yüksek ve ışık geçirgenlik değerleri daha düşük filmler oluşmasına neden olmuş olabilir.…”