Effect of Temperature on Barrier Properties of Soy Protein Isolate Films

2011 ◽  
Vol 380 ◽  
pp. 270-273 ◽  
Author(s):  
Xiu Feng Ma ◽  
Mo Chen ◽  
Kai Meng ◽  
Fei Fei Li
Keyword(s):  
Water Vapour ◽  
Soy Protein ◽  
Transmission Rate ◽  
Soy Protein Isolate ◽  
Barrier Properties ◽  
Protein Isolate ◽  
Effect Of Temperature ◽  
Arrhenius Model ◽  
Influence Of Temperature On ◽  
The Relationship

The influence of temperature on oxygen and water vapour permeation in cast soy protein isolate (SPI) films was investigated at the range of 10–40° C at 50% relative humidity. At tested temperatures, the SPI films exhibited transmission rate values of 22.48–150.90 g m−2day−1and 5.67–67.48 cm3m−2day−1for water vapour and O2, respectively. The results indicated that the relationship between temperature and the oxygen/water vapour transmission rate of the SPI films followed an exponential grow curve [y=A*exp(x/B) + C]. Furthermore, the activation energy (Ea) value of the O2permeation process was calculated by fitting the Arrhenius model to the experimental data.

scholarly journals Ultrasonic-modified montmorillonite uniting ethylene glycol diglycidyl ether to reinforce protein-based composite films

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 433-442
Author(s):  
Hua He ◽  
Rui-jing Jia ◽  
Kai-qiang Dong ◽  
Jia-wen Huang ◽  
Zhi-yong Qin
Keyword(s):  
Ethylene Glycol ◽  
Soy Protein ◽  
Soy Protein Isolate ◽  
Composite Films ◽  
Barrier Properties ◽  
Protein Isolate ◽  
Diglycidyl Ether ◽  
X Ray Diffraction ◽  
Protein Film ◽  
Modified Montmorillonite

Abstract A novel biodegradable protein-based material (UMSPIE) that consists of natural polymer soy protein isolate (SPI), ultrasonic-modified montmorillonite (UMMT), and ethylene glycol diglycidyl ether (EGDE) was produced by solution casting. Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM) were used to characterize the chemical structure and micro-morphologies of as-synthesized protein-based composite films. The results showed that the interlayer structure of MMT was destroyed by ultrasonic treatment, and the hydrogen bonding between SPI chains and the ultrasound-treated MMT plates was enhanced. The synergistic effect of UMMT and EGDE on SPI molecules made the network structure of the UMSPIE film denser. In addition, the mechanical and barrier properties of the as-synthesized films were explored. Compared with pure soy protein film, the tensile strength of the UMSPIE film has an increase of 266.82% (increasing from 4.4 to 16.14 MPa). From the above, the modified strategy of layered silicates filling combining crosslinking agents is considered as an effective method to improve the functional properties of bio-based polymer composites.

Mechanical and Physical Properties of Soy Protein Films with pH-Modified Microstructures

2008 ◽  
Vol 14 (2) ◽  
pp. 119-125 ◽  
Author(s):  
A.N. Mauri ◽  
M.C. Añón
Keyword(s):  
Soy Protein ◽  
Disulfide Bonds ◽  
Mechanical Test ◽  
Soy Protein Isolate ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Protein Isolate ◽  
Vapor Permeability ◽  
Protein Films ◽  
The One

Mechanical, physical, and barrier properties of films obtained from soy protein isolate solutions at different pH were studied and correlated with the structural properties and the microstructure of films. Films obtained at pH 2 and 11, which had denser microstructures and a higher amount of disulfide bonds, showed a higher tensile strength — of about 1.05 MPa — and a higher Young's modulus — of at least 0.15MPa — than the one at pH 8. However, films formed at alkaline pH (8 and 11) exhibited a higher deformation than films at pH 2 — by about 70%. The presence of at least a protein fraction in native state allowed macromolecules to unfold during the mechanical test, reaching greater deformation before breaking. Acidic films exhibited higher water vapor permeability — of about 7 × 10-11 g/m s Pa — and water content — of about 1.5% — and a lower glass transition temperature — of at least 15 °C — than basic ones, due to their higher hydrophilic nature.

scholarly journals Polyvinyl alcohol/soy protein isolate nanofibrous patch for wound-healing applications

2019 ◽  
Vol 8 (3) ◽  
pp. 185-196 ◽  
Author(s):  
Bahareh Khabbaz ◽  
Atefeh Solouk ◽  
Hamid Mirzadeh
Keyword(s):  
Wound Healing ◽  
Polyvinyl Alcohol ◽  
Soy Protein ◽  
Transmission Rate ◽  
Soy Protein Isolate ◽  
Biological Properties ◽  
Protein Isolate ◽  
Two Samples ◽  
Significant Difference ◽  
Uptake Test

Abstract Soy protein isolate (SPI), due to its biocompatibility, biodegradability, abundance and being inexpensive, is a suitable polymer for medical applications. In this study, electrospun nanofibrous mats (ENMs) and casting films (CFs), comprising polyvinyl alcohol (PVA)/SPI, were prepared and compared. Both crosslinked ENMs and CFs physical, chemical, mechanical, and biological properties were investigated for wound-healing applications. Considering the importance of exudate absorption by wound dressing the uptake test of all samples was performed in simulated exudate solution. The amount of absorbed exudate, water vapor transmission rate, and mechanical elongation for CFs were 69.243% ± 22.7, 266.7 g/m2 day, and 2.0825% and increased to 383.33% ± 105.3, 1332.02 g/m2 day, and 12.292% in the case of ENMs, respectively. There was no significant difference between cell supporting of the two samples due to similar composition and their non-toxic properties. The results showed that ENMs have promising potential in wound-healing applications.

Preparation and Characterization of Soy Protein Isolate Films Incorporating Modified Nano-TiO2

2019 ◽  
Vol 15 (7) ◽  
Author(s):  
Yuanyuan Liu ◽  
Lina Xu ◽  
Rui Li ◽  
Huangjiang Zhang ◽  
Wenhui Cao ◽  
...  
Keyword(s):  
Soy Protein ◽  
Soy Protein Isolate ◽  
Antimicrobial Properties ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Protein Isolate ◽  
Vapor Permeability ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nano Titanium Dioxide

AbstractAntimicrobial films were prepared by incorporating nano-titanium dioxide (TiO2) modified by silane into soy protein isolate (SPI) films. The effects of different concentrations of modified nano-TiO2 (TiO2-NM) on the physical properties, antimicrobial properties, and microstructure of the SPI-based films were investigated. Attenuated total reflectance Fourier-transform infrared spectroscopy indicated that the interaction between the SPI and TiO2-NM was via hydrogen bonds. Scanning electron microscopy and atomic force microscopy both showed that the microstructure of SPI-based films with TiO2-NM was compact. Moreover, as the content of TiO2-NM increased from 0 to 1.5 g/100 mL, the water vapor permeability and oxygen permeability were decreased from 5.43 to 4.62 g· mm/m2d· kPa and 0.470 to 0.110 g· cm−2· d−1, respectively. An increase from 6.67 MPa to 14.56 MPa in tensile strength and a decrease from 36.53% to 27.62% in elongation at break indicate the optimal mechanical properties of all groups. TiO2-NM films had excellent UV barrier properties, with a whiter surface with increasing TiO2-NM content. In addition, the SPI-based films with TiO2-NM showed antimicrobial activity, as evidenced by an inhibitory zone increasing from 0 to 27.34 mm. Therefore, TiO2-NM can be used as an antimicrobial agent in packaging films.

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