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Laccase-mediated functionalization of chitosan with 4-hexyloxyphenol enhances antioxidant and hydrophobic properties of copolymer.
- Source :
-
Journal of biotechnology [J Biotechnol] 2018 Mar 10; Vol. 269, pp. 8-15. Date of Electronic Publication: 2018 Feb 04. - Publication Year :
- 2018
-
Abstract
- An effective method to functionalize chitosan with 4-hexyloxyphenol (HP) under homogeneous reaction conditions was developed using laccase as the catalyst. The resulting copolymer was characterized for chemical structure, grafted-HP content, surface morphology, thermal stability, antioxidant capacity, hydrophobic properties and tensile strength. Solid-state <superscript>13</superscript> C NMR spectrum confirmed the incorporation of HP onto chitosan. X-ray diffraction (XRD) showed a decrease in the degree of crystallinity for laccase/HP treated chitosan compared to pure chitosan. The grafted-HP content in laccase/HP-treated chitosan first increased and then declined with increase of the initial HP/chitosan ratio. A heterogeneous surface with spherical particles on the laccase/HP treated chitosan was observed by environmental scanning electron microscopy (ESEM) and scanning probe microscopy (SPM). The laccase/HP treatment of chitosan improved the thermal stability of copolymer. More significantly, the HP functionalized chitosan showed greatly improved ABTS <superscript>+</superscript> and DPPH radicals scavenging capacity, compared with pure chitosan. The hydrophobicity property of the HP functionalized chitosan also significantly increased although its tensile strength decreased. This new type of composite with double functionalities (i.e., antioxidant and hydrophobic) could potentially be used as food packaging materials or coating agents.<br /> (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Subjects :
- Antioxidants metabolism
Ascomycota
Biphenyl Compounds analysis
Biphenyl Compounds metabolism
Chitosan metabolism
Fungal Proteins metabolism
Hydrophobic and Hydrophilic Interactions
Microscopy, Electron, Scanning
Phenyl Ethers metabolism
Picrates analysis
Picrates metabolism
Surface Properties
Tensile Strength
X-Ray Diffraction
Antioxidants chemistry
Chitosan chemistry
Laccase metabolism
Phenyl Ethers chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4863
- Volume :
- 269
- Database :
- MEDLINE
- Journal :
- Journal of biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 29408201
- Full Text :
- https://doi.org/10.1016/j.jbiotec.2018.01.015