Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 213, Issue -, Pages 804-813Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.06.037
Keywords
Amphiphilic chitosan; Genipin crosslinked film; Fruit preservation
Funding
- National Natural Science Foundation of China [52072190]
- Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province
- Jinan Science and Technology Bureau [2019GXRC021]
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In this study, two amphiphilic chitosan derivative films were prepared by crosslinking with genipin, and they showed excellent mechanical properties, antibacterial activity, and preservation effects on fruits.
As a material for films used to keep fruits fresh, chitosan has attracted extensive interest because of its advantages of degradability, environmental friendliness, and biocompatibility. In this study, two amphiphilic chitosan derivative films were prepared by crosslinking N-2-hydroxypropyl-3-butyl ether-O-carboxymethyl chitosan (HBCC) and N-2-hydroxypropyl-3-(2-ethylhexyl glycidyl ether)-O-carboxymethyl chitosan (H2ECC)) with genipin, an excellent natural cross-linking agent. The microstructures, mechanical properties, water vapor permeability, swelling ratios, light transmittance, wettability, thermal stability, antibacterial properties, and biocompatibility of the crosslinked films were characterized. The results showed that the crosslinked films had compact structures, low moisture permeability, strong water resistance, strong ultraviolet resistance, unaffected visible light transmittance, and good hydrophilicity. Compared with the uncrosslinked films, the tensile strength of the genipincrosslinked ones was increased by 328.33 % (HBCC) and 397.83 % (H2ECC). More importantly, the crosslinked films had strong antibacterial activity against Staphylococcus aureus and Escherichia coli and were non-toxic to endothelial cells. The crosslinked films could effectively prolong the preservation time of strawberries, inhibit the decay of strawberries, and inhibit the reduction of vitamin C in strawberries. In conclusion, genipincrosslinked HBCC and H2ECC films are potential fruit preservation materials.
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