scholarly journals High-Performance Soy Protein Isolate-Based Film Synergistically Enhanced by Waterborne Epoxy and Mussel-Inspired Poly(dopamine)-Decorated Silk Fiber

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1536
Author(s):  
Pang ◽  
Zhao ◽  
Qin ◽  
Zhang ◽  
Li
Keyword(s):  
Soy Protein ◽  
High Performance ◽  
Food Packaging ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Food Preservation ◽  
Silk Fiber ◽  
13C Nuclear Magnetic Resonance ◽  
Waterborne Epoxy

It remains a great challenge to fabricate bio-based soy protein isolate (SPI) composite film with both favorable water resistance and excellent mechanical performance. In this study, waterborne epoxy emulsions (WEU), which are low-cost epoxy crosslinkers, together with mussel-inspired dopamine-decorated silk fiber (PSF), were used to synergistically improve the water resistance and mechanical properties of SPI-based film. A stable crosslinking network was generated in SPI-based films via multiple physical and chemical combinations of WEU, PSF, and soy protein matrixes, and was confirmed by attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), and solid state 13C nuclear magnetic resonance (13C NMR). As expected, remarkable improvement in both water resistance and Young’s modulus (up to 370%) was simultaneously achieved in SPI-based film. The fabricated SPI-based film also exhibited favorable thermostability. This study could provide a simple and environmentally friendly approach to fabricate high-performance SPI-based film composites in food packaging, food preservation, and additive carrier fields.

scholarly journals A high-performance bio-adhesive derived from soy protein isolate and condensed tannins

RSC Advances ◽  
2017 ◽  
Vol 7 (34) ◽  
pp. 21226-21233 ◽  
Author(s):  
Chang Liu ◽  
Yi Zhang ◽  
Xiaona Li ◽  
Jing Luo ◽  
Qiang Gao ◽  
...  
Keyword(s):  
Natural Products ◽  
Soy Protein ◽  
Condensed Tannins ◽  
High Performance ◽  
Soy Protein Isolate ◽  
Crosslinking Density ◽  
Protein Isolate ◽  
Soy Proteins ◽  
Main Achievement ◽  
Covalent Interactions

We describe the formulation of an adhesive only from natural products: soy proteins and condensed tannins. The main achievement is a high crosslinking density, which was attributed to aminomethylene bridges and covalent interactions.

Preparation and its Properties of the Urea Modified Soy Protein Isolate Adhesives

2012 ◽  
Vol 580 ◽  
pp. 481-484 ◽  
Author(s):  
Jian Jun Xie ◽  
Na Li ◽  
Nian Zeng
Keyword(s):  
Soy Protein ◽  
Water Resistance ◽  
Guanidine Hydrochloride ◽  
Soy Protein Isolate ◽  
Environmentally Friendly ◽  
Protein Isolate ◽  
Resource Scarcity ◽  
Molecular Chain ◽  
Hydrophobic Group ◽  
Optimum Formula

Soy proteins have shown great potential for use as renewable and environmentally friendly adhesives. The orthogonal experiments are designed for the urea-modified soy protein isolate(SPI) adhesives and the optimum formula is obtained. The mass concentrations of SPI and urea are 14% and 8%(relative to the total mass of SPI and water), the reaction temperature and time are 35°C and 60 min, respectively. Some basic and adhesion properties and its structure of the modified SPI adhesive for the optimum formula are measured. The viscosity is 43Pa.s, and the dry- and wet-state adhesion strengths of the urea-modified SPI optimum formula are 0.96MPa and 0.78MPa(>0.72MPa), respectively according to GB/T10724-2006, which satisfied with the requirement of the II-type plywood. Its surface hydrophobicity is improved and the thermal properties is slightly improved after 200°C. Recently, some concerns about environmental pollution, resource scarcity, and related health issues have pushed scientists to replace the petrochemicals-based synthetic polymers, which are used extensively in construction, packaging, glue and plywood industries, with the bio-based adhesives. SPI adhesives have shown great potential for use as environmentally friendly adhesives in plywood since 1930s when it’s first be developed. And it has been modified by chemical alkali[1], sodium dodecyl sulfate(SDS)[2,3], and urea[2], guanidine hydrochloride[4], etc. However, most of these modifications can not very well improve the water resistance and the bonding strength separately. Poor water resistance is a fatal weakness which seriously restricts the application in the industry. Many studies[5~8] have shown that the adhesives with some enhanced performances, for example, adhesion strength and water-resistant, can be obtained by unloading SPI molecular chain with the hydrophobic group using urea, SDS, other surfactant and guanidine hydrochloride, etc. And the unloading mechanism of the SPI molecular chain with the hydrophobic group is proclaimed. The optimum concentration of urea is 1mol/L for the water-resistant. The aim of this research was to improve the tacky strength and the water resistance[9] by using urea to modify SPI and evaluate the resulting adhesive’s potential for use in the plywood.

scholarly journals Banana Peel Cellulose Nanofibers (CNFs) as Retrofitting Material to Soy-Protein in Manufacturing Biodegradable Food Packaging

2020 ◽  
Vol 1 (1) ◽  
pp. 10-29
Author(s):  
Vandon T. Borela ◽  
Dhian Ashley DS. Apolinar
Keyword(s):  
Tensile Strength ◽  
Soy Protein ◽  
Dimensional Stability ◽  
Food Packaging ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Strength Test ◽  
Banana Peel ◽  
Tensile Strength Test ◽  
Sem Imaging

Purpose: The aim of this study is to examine the potential of Cellulose Nanofiber(CNF) isolated from the banana peel through chemical treatment(Alkaline Treatment, Bleaching and Acid Hydrolysis) as reinforcing agent in Soy Protein Isolate films. It also aims to find an application for this agro-industrial residue as a biodegradable material for food packaging. Study Design: Experimental Design. Materials and Methods: Chemicals such as Sodium metabisulfite, Ethanol, Potassium hydroxide, Sodium hypochlorite, Acetic Acid, Sulfuric acid, Glycerol, Sodium Hydroxide, and Hydrochloric Acid were bought from a chemical depot. FTIR Spectroscopy, SEM Imaging, Tensile Strength Test, Dimensional Stability to Heat Test were performed. Results: The results of the tests conducted(FTIR Spectroscopy, SEM Imaging, Tensile Strength Test, Dimensional Stability to Heat Test and Stability in Acidic and Alkaline Conditions Test) showed that CNFs isolated from the banana effectively reinforced the properties of Soy Protein Isolate films. Furthermore, the films fabricated are still biodegradable, displaying that the addition of the CNF does not have any significant effect on the biodegradability of the films. Conclusion: It is concluded that the addition of Banana Peel CNFs as retrofitting material to the Soy Protein Films materially strengthen the mechanical properties of the films and makes it more suitable for food packaging applications.

Bio-based films with improved water resistance derived from soy protein isolate and stearic acid via bioconjugation

2019 ◽  
Vol 214 ◽  
pp. 125-131 ◽  
Author(s):  
Qianqian Ye ◽  
Yufei Han ◽  
Jizhi Zhang ◽  
Wei Zhang ◽  
Changlei Xia ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Soy Protein ◽  
Water Resistance ◽  
Soy Protein Isolate ◽  
Protein Isolate
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