Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 11, Pages 3452-3465Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c07275
Keywords
glucose-citric acid natural deep eutectic solvent; wheat gluten; ultrahigh deamidation; hydrogen bond; conformation changes
Funding
- National Natural Science Foundation of China [31201287]
- Science Foundation Program of Fujian province of China [2016LSX]
- Outstanding Youth Research Teachers Program of Fujian province Education Department of the year of 2017
- Scientific Technological Program of Fuzhou [2018-G81]
- Natural Science Foundation of Guangdong Province [2018A0303130048]
- Tianjin Science and Technology Major Special and Engineering (123 Industrial Integration and Development Science and Technology Demonstration Project) [18zxyenc00080]
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An efficient technique using citric acid and glucose based natural deep eutectic solvent (G-C-NADES) was developed to obtain ultrahigh deamidated wheat gluten (UDWG) with a deamidation degree of up to 92.45%, 22% higher than traditional citric-acid-DWG method. The technique demonstrates enhanced accessible conformation of WG through HBs of G-C-NADES, contributing to the improvement on the nucleophilic attack of deamidation and potentially guaranteeing the safety of wheat gluten based cereal food in terms of lowering its allergenicity.
An efficient technique using citric acid and glucose based natural deep eutectic solvent (G-C-NADES) was developed to obtain ultrahigh deamidated wheat gluten (UDWG) (deamidation degree (DD) > 90%). FTIR and H-1 NMR indicated intensive hydrogen bonds (HBs) in G-C-NADES supermolecules. Quantum chemical calculations and molecular dynamic simulations demonstrated that 10 wt % diluted G-C-NADES still had a myriad of HBs. Physicochemical results showed UDWG had DD up to 92.45% after G-C-NADES deamidation, that is, 22% higher than citric-acid-DWG with a weak degree of hydrolysis (1.75%). Conformational characterization demonstrated the obvious conversion from alpha-helix to beta-sheet via FTIR, the least amount of disulfide bonds by Raman spectra, and more exposure of tryptophan residues by fluorescence measurement for UDWG. It is proven that enhanced accessible conformation of WG reached with HBs of G-C-NADESs could contribute to the improvement on nucleophilic attack of deamidation, declaring that G-C-NADES might be a potential solvent for obtaining an ultrahigh deamidation for WG to successfully guarantee the safety of wheat gluten based cereal food regarding to lowering its allergy.
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