The structure of hemicellulose extracted from corncob was investigated to reveal that the lowest degree of branching and lower molecular weight of hemicellulose led to low steric hindrance, which was beneficial to Mailard reaction. Novel functional biomaterials based on hemicellulose of corncob and chitosan were constructed by the regulation of Maillard reaction process. Meanwhile, the correlations between structure and properties of the biomaterials were figured out. Their structures and properties were studied with fluorescence spectra, FT-IR, X-ray diffraction, antioxidant activity and antimicrobial assessment. The results indicated that the lower molecular weight of the reactants was, and the more easily Maillard reaction occurred. The antioxidant capacity and antibacterial activity of xylan-chitooligomer-zinc complex obtained by optimizing the reaction conditions were 2.5 times and 5 times higher than that of chitooligomer, respectively. On the other hand, the novel biomaterials were constructed via Schiff base reaction between the amino group of the chitosan or carboxymethyl chitosan and the reductive carbonyl group of the hemicellulose by incorporating TiO<sub>2</sub> nanoparticles into the network structure. The biomaterials exhibited excellent antibacterial activity and hemostasis properties. Furthermore, xylan-chitosan-nanoTiO<sub>2</sub> hybrid with multiple structure and abundant adsorption sites were also fabricated, showing an outstanding candidate as a kind of recyclable, effective, and selective bioadsorbent for the removal of heavy metal ions from wastewater.

Construction of functional biomaterials of hemicellulose-chitosan

249th National Meeting (2015)

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