Biografting
is a promising and ecofriendly approach to meet various
application requirements of products. Herein, a popular green enzyme,
laccase, was adopted to graft a hydrophobic phenolic compound (lauryl
gallate, LG) onto chitosan (CTS). The resultant chitosan derivate
(Lac/LG-CTS) was systematically analyzed by Fourier transform infrared
(FTIR), grafting efficiency, scanning probe microscopy (SPM), and
X-ray diffraction (XRD). This grafting technique produced a multifunctional
chitosan copolymer with remarkably enhanced antioxidant property,
hydrophobicity, and moisture barrier property. Furthermore, the swelling
capacity and acid solubility of the copolymer film decreased significantly,
although the tensile strength and elongation were slightly weakened
as compared to those of native chitosan. These results suggest that
the Lac/LG-CTS holds great potential as a food-packaging material,
preservative agent, or edible coating material.
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