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

Ye, Qianqian; Han, Yanchun; Zhang, Jizhi; Zhang, Wei; Xia, Changlei; Li, Jianzhang

doi:10.1016/j.jclepro.2018.12.277

Cited by 78 publications

(36 citation statements)

References 31 publications

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“…Water resistance was evaluated by conducting water solubility (WS) and swelling ratio (SR) tests. To measure the WS, 40 mm × 40 mm nanofiber film samples were prepared and weighed (W 0 ) following the method in [25]. The samples were then immersed in distilled water at 25 • C for 24 h. Undissolved sample portions were subsequently removed from the water and the surface water was removed with filter paper prior to weighing (W 1 ).…”

Section: Water Resistancementioning

confidence: 99%

Effects of Heat Treatment and Tea Polyphenols on the Structure and Properties of Polyvinyl Alcohol Nanofiber Films for Food Packaging

et al. 2020

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In this study, biodegradable polyvinyl alcohol (PVA) was blended with natural antioxidant tea polyphenols (TPs) to produce PVA/TP nanofiber films by electrospinning. The effects of heat treatment and TP incorporation on the structural and physical properties of the films were then evaluated. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) revealed that the PVA/TP nanofiber film has a more compact structure and better morphology than PVA alone. In addition, the water resistance was enhanced, and the formation of hydrogen bonds between the TP and PVA molecules increased via the heat treatment. Furthermore, the mechanical, antioxygenic, and antibacterial properties of the nanofiber films were significantly improved (P < 0.05) owing to the incorporation of TP. In particular, when the mass ratio of the PVA/TP was 7:3, the elongation at break (EAB) of the film increased to 105.24% ± 2.87%, and the antioxidant value reached a maximum at 64.83% ± 5.21%. In addition, the antibacterial activity of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) increased to the maximum levels of 82.48% ± 2.12% and 86.25% ± 2.32%, respectively. In summary, our study produced a functional food packaging material that includes preservation with an acceptable bioactivity, ability to keep food fresh, and biodegradability.

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Section: Water Resistancementioning

confidence: 99%

Effects of Heat Treatment and Tea Polyphenols on the Structure and Properties of Polyvinyl Alcohol Nanofiber Films for Food Packaging

et al. 2020

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“…Soy protein, which is a by-product of the soybean oil processing industry, is a renewable natural resource, making it an ecofriendly, inexpensive, and readily available raw material for bio-based wood adhesives. However, the use of soy protein has been hindered by its poor water resistance [3,4], because the bond strength of soybean meal-based adhesive (SPA) primarily depends on the physical interlocking of protein molecules and hydrogen bonds, which are easily disrupted by moisture [5,6]. Numerous recent studies have explored various strategies to improve the water-resistance of SPAs, including denaturation [7], grafting [8], and crosslinking [9].…”

Section: Introductionmentioning

confidence: 99%

Soybean Meal-Based Wood Adhesive Enhanced by Phenol Hydroxymethylated Tannin Oligomer for Exterior Use

Chen

Zhang

et al. 2020

Polymers

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Bio-based adhesives have low water resistance and they are less durable than synthetic adhesives, which limits their exterior applications. In this study, a bio adhesive was developed from soybean meal and larch tannin that was designed for exterior use. Phenol hydroxymethylated tannin oligomer (PHTO) was synthesized and then mixed with soybean meal flour in order to obtain a soybean meal-based adhesive (SPA). The results showed that the moisture absorption rate, residual rate, and solid content of SPA with 10 wt % PHTO (mass ratio with respect to the entire adhesive) were improved by 22.8%, 11.6%, and 6.8%, respectively, as compared with that of pure SPA. The wet shear strength of plywood with SPA with 10 wt % PHTO (boiling in 100 °C water for 3 h) was 1.04 MPa when compared with 0 MPa of pure SPA. This met the bond strength requirement of exterior-use plywood (GB/T 9846.3-2004). This improved adhesive performance was mainly due to the formation of a crosslinked structure between the PHTO and the protein and also PHTO self-crosslinking. The formaldehyde emission of the resulting plywood was the same as that of solid wood. The PHTO-modified SPA can potentially extend the applications of SPAs from interior to exterior plywood.

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“…In order to relate the properties of the films to their structure, XRD and SEM analyses were carried out. As can be seen in Figure 9 , two peaks appeared around 9° and 20°, associated to the α-helix and β-sheet structures of the soy protein secondary conformation, respectively [ 45 ]. Among the samples under study, when EPS were added, the most relevant difference was related to the increase in the intensity in the peak located around 20°, which indicated that the degree of structural order also increased [ 46 ], due to the new interactions formed between SPI and EPS, as shown in FTIR spectra.…”

Section: Resultsmentioning

confidence: 99%

Compression Molded Soy Protein Films with Exopolysaccharides Produced by Cider Lactic Acid Bacteria

et al. 2020

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Two exopolysaccharide (EPS)-producing lactic acid bacteria (LAB) strains, Liquorilactobacillus (L.) sp CUPV281 and Liquorilactobacillus (L.) mali CUPV271, were isolated from Spanish apple must. Each of the strains produced a dextran, with different branching degrees, to be incorporated into soy protein isolate (SPI) film-forming formulations. Films were prepared by compression molding, a more rapid processing method than solution casting and, thus, with a greater potential for scaling-up production. Thermal analysis showed that SPI and EPS start the degradation process at temperatures above 190 °C, confirming that the compression temperature selected (120 °C) was well below the corresponding degradation temperatures. Resulting films were transparent and homogeneous, as shown by UV-Vis spectroscopy and SEM, indicating the good compatibility between SPI and EPS. Furthermore, FTIR analysis showed that the interactions between SPI and EPS were physical interactions, probably by hydrogen bonding among the polar groups of SPI and EPS. Regarding antifungal/fungistatic activity, LAB strains used in this study showed an inhibitory effect on germination of fungal spores.

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

Cited by 78 publications

References 31 publications

Effects of Heat Treatment and Tea Polyphenols on the Structure and Properties of Polyvinyl Alcohol Nanofiber Films for Food Packaging

Effects of Heat Treatment and Tea Polyphenols on the Structure and Properties of Polyvinyl Alcohol Nanofiber Films for Food Packaging

Soybean Meal-Based Wood Adhesive Enhanced by Phenol Hydroxymethylated Tannin Oligomer for Exterior Use

Compression Molded Soy Protein Films with Exopolysaccharides Produced by Cider Lactic Acid Bacteria

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