Effect of urea concentration on properties of peanut protein isolate, arachin and conarachin-based adhesives during urea-epichlorohydrin modification

Chen, Chen; Du, Yan; Chen, Fusheng

doi:10.1098/rsos.202227

Cited by 5 publications

(1 citation statement)

References 36 publications

(52 reference statements)

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“…Firstly, NaOH can disrupt the tertiary and quaternary structure of protein molecules by breaking chemical bonds, such as ionic, hydrogen, and disulfide bonds in the protein molecules 18,20 . This disruption makes the protein denaturation severe and unfavorable for stretching protein molecules under high‐concentration conditions 21 . Secondly, urea also interacts with van der Waals forces between protein molecules, 19,22 reducing the interaction force between protein molecules and promoting the depolymerization of protein molecules, which leads to a decrease in viscosity.…”

Section: Resultsmentioning

confidence: 99%

Acrylamide macromolecules modified wine lees‐soy protein wood adhesive

Zhong,

Hou,

Peng

et al. 2024

J of Applied Polymer Sci

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To expand the diverse applications of wine lees and enhance the adhesive properties of its protein‐based adhesive, the supernatant of wine lees, separated using the alkali solubilization method, was combined with a small quantity of soybean protein as the raw material. Cross‐linking modification was then conducted using polyacrylamide polymers to prepare the protein‐based adhesive. The results indicated that a total mass fraction of 2.5 wt% NaOH and 3.0 wt% urea effectively stretched the protein structure. Additionally, a mass ratio of 4:10 of trimethylolpropane triglycidyl ether and acrylamide, under the action of the ammonium persulfate initiator, resulted in effective cross‐linking of polyacrylamide macromolecules. The addition of 7 wt% polyacrylamide macromolecules as a cross‐linking agent effectively facilitated the cross‐linking reaction with wine lees‐soy protein. After the cross‐linking modification, the surface of the adhesive became tight and smooth. As a result, the water‐resistance strength of the plywood increased from 0.2 to 1.27 MPa, marking a 635% enhancement, which significantly surpassed the standard for Class II plywood (GB/T 9846‐2015).

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Section: Resultsmentioning

confidence: 99%

Acrylamide macromolecules modified wine lees‐soy protein wood adhesive

Zhong,

Hou,

Peng

et al. 2024

J of Applied Polymer Sci

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Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

et al. 2022

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s: Acrylonitrile‐based adsorbents are effective candidates for metal ions removal from wastewater. However, their performance is often limited by their unsatisfied stability, reusability, and sorption efficiency. In this contribution, the amino group of urea was cross‐linked with the carboxyl group of the firstly formed AN (acrylonitrile) and AA (acrylic acid) copolymer to improve the strength, while the cyanide group of AN was dedicatedly reacted with hydroxylamine hydrochloride to obtain an amidoxime group endowing the strong adsorption capacity for Cu (II). The optimum adsorption conditions of the as‐prepared adsorbent for Cu (II) were at 25 °C and pH 7, which only consumed 60 min to reach the adsorption equilibrium. The theoretical maximum adsorption capacity was 176.717 mg g−1. The amidoxime group on the surface of the adsorbent was inherently entitled to the outstanding adsorption capacity. Langmuir and pseudo‐second‐order model fitted the adsorption process. Furthermore, there still retained 84.4 % of the original adsorption capacity after seven cycles. Under column adsorption, the adsorbed particles were surprisingly lumped together, which can be easily taken out entirely after adsorption for recycling collection. Overall, the obtained acrylonitrile‐based adsorbents, easily regenerated with high performance and excellent sorption efficiency, should be a promising sorbent.

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Optimizing a canola-gelatine-urea bio-adhesive: effects of crosslinker and incubation time on the bonding performance

Tene Tayo,

Cárdenas-Oscanoa,

Beulshausen

et al. 2024

Eur. J. Wood Prod.

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The importance of creating eco-friendly and health-conscious materials has become paramount in striving to attain long-term development goals. For the past decades, constant efforts have been made to tackle the issue of formaldehyde release from wood-based panels which, to date, are still mainly produced from unsustainable synthetic adhesives. In the pursuit of sustainable and environmentally responsible adhesive solutions for the wood industry, sodium bisulfate, sodium bisulfite, and sodium nitrite were used under different heat treatment conditions as crosslinkers for canola protein-based bio-adhesive formulations. The developed adhesive formulations showed outstanding mechanical properties, with a viscosity below 4000 mPa/s despite the relatively high solid content, as well as excellent bonding performances. The one-layer particleboards bonded with the canola-based adhesive demonstrated outstanding mechanical properties, with the internal bonding and the bending strength values surpassing 0.60 N/mm2 and 10 N/mm2, respectively. Notably, the sodium nitrite-crosslinked variants exhibited significantly superior performance compared to the UF-bonded control boards. Longer incubation times generally improve bonding strength, with sodium nitrite showing the most pronounced effects. The results of this research showcase not only the possibility of developing a plant protein-based wood adhesive with high solid content, but also the potential superiority of canola protein-based wood adhesives when compared to conventional, synthetic counterparts. These findings offer valuable insights for optimizing bio-based adhesives in wood composite manufacturing, highlighting sodium nitrite as a promising crosslinker for enhancing the adhesive’s performance.

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Effect of urea concentration on properties of peanut protein isolate, arachin and conarachin-based adhesives during urea-epichlorohydrin modification

Cited by 5 publications

References 36 publications

Acrylamide macromolecules modified wine lees‐soy protein wood adhesive

Acrylamide macromolecules modified wine lees‐soy protein wood adhesive

Cross‐Linked Amidoximated Poly(acrylonitrile‐acrylic acid) Microspheres with Exceptional Adsorption Capacity, Reusability towards Copper(II): Batch and Column Studies

Optimizing a canola-gelatine-urea bio-adhesive: effects of crosslinker and incubation time on the bonding performance

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