The Reaction between Furfuryl Alcohol and Model Compound of Protein

Abstract

Abstract:To guide the preparation of protein-based adhesive, especially the soy-based adhesive, the reaction between a simple dipeptide N-(2)-L-alanyl-L-glutamine (AG), being used as a model compound of protein, and its cross-linker furfuryl alcohol were studied in this paper. The products that were prepared with furfuryl alcohol and AG under different pHs were analyzed by ESI-MS, 13 C NMR, and FT-IR. It was found that the medium environment had great effects on the competition of the co-condensation reaction between furfuryl alcohol and AG and self-condensation reaction of furfuryl alcohol molecules in the mixing system with furfuryl alcohol and AG. Under alkaline conditions, both co-and self-condensation were not obviously detected. Only when the value of pH was higher than 11, were a few co-condensation reaction products gotten. The reaction occurred mainly between furfuryl alcohol and the primary amido groups of AG. Under acid conditions, both co-and self-condensation were observed. The more acid the preparation conditions were, the easier to be observed the self-condensation of furfuryl alcohol molecules would be than the co-condensation between furfuryl alcohol and AG. When the value of pH was higher than 5, both coand self-condensation were not outstanding. In this study, under pH 3, the co-and self-condensation found equilibrium. There was a great possibility for the primary amido and aliphatic amino groups of AG molecules to react with furfuryl alcohol molecules. No reaction was detected between the secondary amido groups of AG and furfuryl alcohol.

Artificial Q‐Grader: Machine Learning‐Enabled Intelligent Olfactory and Gustatory Sensing System

“…The results of chemicals that affect coffee flavor are encompassed in Table S2 (Supporting Information). [30][31][32][33][34] The data gained from FTIR-ATR spectrum supports the core idea that the structural states of targeted chemicals are sensitive to interact with the C─F dipoles of PVDF-HFP. The functional groups of 0.05 wt.% PVDF-HFP dissolved in N,N-dimethylformamide (DMF) were established by FTIR in the ATR mode, as represented in Figure S3 (Supporting Information).…”

Formaldehyde free tannin-based adhesive with epoxy as hardener for plywood

“…Meanwhile, it shows a poor water resistance due to the low reactivity of furfuryl alcohol under alkaline conditions. Furfuryl alcohol has no obvious reaction activity under alkaline conditions, whereas the self-polycondensation reaction and hydroxymethylation mainly occur under acidic conditions (Liang et al 2017). In addition, this study explained the reason behind the cross-linking of polycondensation products between tannin and furfuryl alcohol is weak under alkaline environment.…”

Facile One-Pot Synthesis of Furan Double Schiff Base from 5-Hydroxymethylfurfural via an Amination–Oxidation–Amination Strategy in Water

“…In order to reveal the mechanism of selective oxidation of the hydroxyl group in the furan ring by α-MnO 2 -S-H + , the FT-IR spectra of furfuryl alcohol (FA) adsorbed onto the surface of the catalysts are shown in Figure . When FA was absorbed on α-MnO 2 -S-H + , the infrared absorption peak of C 1 –O 7 with O-terminal adsorption at 1006 cm –1 and that for −CH 2 – with H-terminal adsorption at 2933 and 2874 cm –1 were apparently shifted to the lower region, showing the interaction of hydroxymethyl with the surface of α-MnO 2 -S-H + . However, the changes associated with the infrared absorption peak of the furan ring were not observed.…”