Preparation and characterization of Maillard reacted chitosan films with hemicellulose model compounds

Abstract

The Maillard reaction between chitosan and hemicellulose model compounds such as mannose, xylose, and glucuronic acid was investigated. Chitosan and the compounds were dissolved in 1% acetic acid and were dried at 508C. In an analysis of the film obtained, weight increase, color difference, FTIR, relative amount of free amino groups, insolubility to dilute acetic acid, and tensile properties were measured. The film weight increased gradually as the compounds were added, and the color difference changed significantly. In addition, the relative amount of free amino groups decreased rapidly, and the insoluble matter increased markedly. In particular, xylose brought about drastic changes in a small amount addition. According to the results of FTIR spectra, the cleavage of sugar unit of chitosan and the formation of heterocyclic compounds were observed in all compounds. The formation of carbonyl and carboxyl groups was observed with the addition of a large amount of the compounds. The tensile strength was improved in 10-20 wt % additions of the compounds.

Characterization of bagasse‐rind particleboard bonded with chitosan

“…In our previous reports, the interactions of chitosan with wood and wood components were investigated. [3][4][5][6] It was clarified that chitosan has good bonding properties with wood, and reacts with reducing sugars such as glucose and xylose. In this study, bagasse particleboards were manufactured by using chitosan as an adhesive.…”

“…The whole peak pattern of this study was very similar to those of the insoluble matters of 10 wt % glucose and xylose added-chitosan films in 5% acetic acid. 5,6 Judging from the assignments of the insoluble matters of 10 wt % glucose and xylose added-chitosan films in 5% acetic acid, the peak at around 1637 cm À1 would be attributed to the overlap of the C¼ ¼O group and the C¼ ¼N linkage, and the peak at 1565 cm À1 would be a secondary amine. According to the results, chitosan reacted with extract containing reducing sugars that were produced by hydrolysis during pressing.…”

“…16,17 In our previous researches, the reactions between chitosan and some reducing sugars such as xylose and glucose were studied. 5,6 The Maillard reaction occurred easily between them, and the reaction products were insoluble in 5% acetic acid. The whole peak pattern of this study was very similar to those of the insoluble matters of 10 wt % glucose and xylose added-chitosan films in 5% acetic acid.…”

Properties of n‐eicosane‐loaded silk fibroin‐chitosan microcapsules

“…The absorption band at 3448 corresponds to hydroxyl group, 20 at 1080 corresponds to the skeletal vibrations involving the CO stretching, which is characteristic of chitosan saccharide structure, 21 at 1653 cm À1 corresponds to C¼ ¼O stretching in amide group (amide I vibration), 21,22 at 1560 cm À1 corresponds to NAH bending in amide group, (amide II vibration) 21 and at 1595 cm À1 corresponds to NAH bending in nonacetylated 2-aminoglucose primary amine. 21,22,23 Two major secondary structures of silk fibroin, Silk I and II, are well known in the literature. 24,25 Silk I is a metastable conformation composed of random coils and a-helix structures.…”

Green Binders for Wood Adhesives

“…Chitosan has been modified with glucose via the Maillard reaction [82,83], aiming at improving bonding properties. The effect of glucose addition to chitosans of varying molecular Applied Adhesive Bonding in Science and Technologyweight was evaluated with respect to bonding properties [84].…”