Effects of Different Denaturants on the Properties of a Hot-Pressed Peanut Meal-Based Adhesive

Abstract

Plant protein-based adhesives could fundamentally solve the problem of formaldehyde-based adhesive releasing formaldehyde, but enhancing bonding strength and water resistance is a necessary measure to realize practical applications. In this study, the effects of different denaturants on the properties of a hot-pressed peanut meal (HPM)-based adhesive before and after crosslinking were studied. Papain, sodium dodecyl sulfate (SDS), urea and crosslinker-polyamide epichlorohydrin (PAE) were used to prepare HPM-based adhesives. The functional groups, bonding strength, thermal behaviors, mass loss, moisture uptake value, viscosity and fracture surface of adhesive samples were analyzed. As a result, (1) papain was used to break HPM protein (HPMP) into polypeptide chains and to reduce the water resistance. (2) SDS and urea unfold the HPMP molecule and expose internal hydrophobic groups to improve the water resistance of the adhesive. (3) A denser network structure was formed by PAE and HPMP molecules, which significantly improved the bonding strength and water resistance of adhesives. In particular, after SDS denaturation and PAE crosslinking, compared with pure HPM adhesive, the wet shear strength increased by 96.4%, the mass loss and moisture uptake value reduced by 41.4% and 69.4%, and viscosity increased by 30.4%. This work provided an essential guide to design and prepare HPM-based adhesives.

Properties and Characterization of Sunflower Seeds from Different Varieties of Edible and Oil Sunflower Seeds

“…The peaks observed near 1662, 1540, and 1240 cm −1 were attributed to the -C=O stretching vibration (amido band I), the N-H bond bending vibration (amido band II), and the C-N stretching and N-H bending vibration (amido band III) [50], respectively. At 1720 cm −1 , the absorption peak was attributed to the ester bond [51] inside sunflower seed meal protein, and the absorption intensity of oil sunflower was greater than that of edible sunflower. The fitting secondary structure of sunflower seed meal protein is shown in Figure 5C.…”

Barley – a yet un-tapped feedstock for improved vegetable protein-based wood adhesives

“…The SP/BGP-PA-T adhesive had the highest shear strength, which demonstrated that the protein hybridization and molecular reorganization strategies signicantly enhanced the mechanical strength of the adhesive. 50,[64][65][66][67][68][69] The wet shear strengths of bio-based adhesives such as lignin, 70,71 starch, sucrose, tannic acid, blood meal, soybean meal and SP/BGP-PA-T were compared; SP/BGP-PA-T also exhibited excellent mechanical strength. [72][73][74][75] SP/BGP-PA-T showed superior wet shear strength compared to peanut meal-based, cotton meal-based, maize protein, wheat gluten, sesame protein and casein adhesives.…”

Research Advances in the High-Value Utilization of Peanut Meal Resources and Its Hydrolysates: A Review

“…The findings revealed that the replacement of fish meal with peanut meal did not yield any significant effects on growth performance, feed utilization, somatic indices, or whole-body composition (p > 0.05). Li et al [107] used peanut meal as a substitute for the original cottonseed protein or soybean protein in the diets of Channel Catfish. Following a 9-week investigation, the findings demonstrated that peanut meal can effectively replace up to 25 wt% of the original cottonseed meal or soybean meal without any detrimental impact on fish growth, feed efficiency, and the body composition of fish.…”