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Accelerated Dissipation of Free and Immobilized Water Facilitating the Intramolecular Dehydration of N-Xylosamine and Conversion Improvement of the Amadori Rearrangement Product of Aspartic Acid–Xylose Reaction
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2021-11-22 , DOI: 10.1021/acs.jafc.1c05827 Ao Zhang 1 , Heping Cui 1 , Khizar Hayat 2 , Qiang Zhang 3 , Xiaoming Zhang 1 , Chi-Tang Ho 4
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2021-11-22 , DOI: 10.1021/acs.jafc.1c05827 Ao Zhang 1 , Heping Cui 1 , Khizar Hayat 2 , Qiang Zhang 3 , Xiaoming Zhang 1 , Chi-Tang Ho 4
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Compared to the method of aqueous Maillard reaction at atmospheric pressure tandem vacuum concentration, a coupling dehydration method combining spray drying and vacuum drying was used to increase aspartic acid–xylose conversion to the Amadori rearrangement product (ARP). The water activity and moisture states were found as effective indicators to characterize the degree of dehydration of Maillard reaction intermediates and efficient formation of ARP. During the vacuum drying process, the water activity of the product powder decreased significantly. Because the formation of ARP was accompanied by intramolecular dehydration, combining spray drying and vacuum drying increased the proportion of bound water in the vacuum-dried product. Free water was easily dissipated via dehydration, which then converted the immobilized water continuously to free water, and the decreased immobilized water further converted the bound water to immobilized water. The reduction in bound water contributed to the intramolecular dehydration of N-substituted d-xylosamine, which would further be transformed to be the ARP through an intramolecular rearrangement. The yield of ARP was increased from 1.68 to 21.53% after spray drying. The ARP yield was substantially increased up to 77.9% by subsequent vacuum drying.
中文翻译：
加速游离水和固定水的消散促进 N-木糖胺的分子内脱水和天冬氨酸-木糖反应的 Amadori 重排产物的转化
Compared to the method of aqueous Maillard reaction at atmospheric pressure tandem vacuum concentration, a coupling dehydration method combining spray drying and vacuum drying was used to increase aspartic acid–xylose conversion to the Amadori rearrangement product (ARP). The water activity and moisture states were found as effective indicators to characterize the degree of dehydration of Maillard reaction intermediates and efficient formation of ARP. During the vacuum drying process, the water activity of the product powder decreased significantly. Because the formation of ARP was accompanied by intramolecular dehydration, combining spray drying and vacuum drying increased the proportion of bound water in the vacuum-dried product. Free water was easily dissipated via dehydration, which then converted the immobilized water continuously to free water, and the decreased immobilized water further converted the bound water to immobilized water. The reduction in bound water contributed to the intramolecular dehydration of N-substituted d-木糖胺，通过分子内重排将进一步转化为 ARP。喷雾干燥后ARP的产率从1.68%提高到21.53%。通过随后的真空干燥，ARP 产率显着提高至 77.9%。
更新日期：2021-12-08
中文翻译：
加速游离水和固定水的消散促进 N-木糖胺的分子内脱水和天冬氨酸-木糖反应的 Amadori 重排产物的转化
Compared to the method of aqueous Maillard reaction at atmospheric pressure tandem vacuum concentration, a coupling dehydration method combining spray drying and vacuum drying was used to increase aspartic acid–xylose conversion to the Amadori rearrangement product (ARP). The water activity and moisture states were found as effective indicators to characterize the degree of dehydration of Maillard reaction intermediates and efficient formation of ARP. During the vacuum drying process, the water activity of the product powder decreased significantly. Because the formation of ARP was accompanied by intramolecular dehydration, combining spray drying and vacuum drying increased the proportion of bound water in the vacuum-dried product. Free water was easily dissipated via dehydration, which then converted the immobilized water continuously to free water, and the decreased immobilized water further converted the bound water to immobilized water. The reduction in bound water contributed to the intramolecular dehydration of N-substituted d-木糖胺，通过分子内重排将进一步转化为 ARP。喷雾干燥后ARP的产率从1.68%提高到21.53%。通过随后的真空干燥，ARP 产率显着提高至 77.9%。
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