Antimicrobial and UV Blocking Properties of Composite Chitosan Films with Curcumin Grafted Cellulose Nanofiber
Antimicrobial and UV Blocking Properties of Composite Chitosan Films with Curcumin Grafted Cellulose Nanofiber
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DOI：
10.1016/j.foodhyd.2020.106337
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发表时间：
2021-03
影响因子：
10.7
通讯作者：
Xinhui Zhang;Yintao Li;M. Guo;T. Jin;S. A. Arabi;Qiao He;B. B. Ismail-B.;Yaqin Hu;Donghong Liu
中科院分区：
文献类型：
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作者：
Xinhui Zhang;Yintao Li;M. Guo;T. Jin;S. A. Arabi;Qiao He;B. B. Ismail-B.;Yaqin Hu;Donghong Liu
壳聚糖因其独特的抗菌性能和优异的成膜能力而在抗菌食品包装中的应用备受关注。但其对紫外光的阻隔性差和水溶性高限制了其应用。在这项研究中，改性纤维素纳米纤维被纳入壳聚糖薄膜中，以提高其紫外线阻挡、物理和抗菌性能。将姜黄素接枝到2,2,6,6-四甲基哌啶-1-氧基(TEMPO)氧化纤维素上得到改性纤维素纳米纤维。红外光谱和X射线光电子能谱结果表明纤维素改性成功。采用浇铸法制备了由壳聚糖（67-100 wt%）和姜黄素接枝的 TEMPO 氧化纤维素纳米纤维（CGTOCNF，0-33 wt%）组成的生物纳米复合膜。扫描电镜图像和X射线衍射分析表明，CGTOCNF的添加显着影响了复合薄膜的形貌，结晶度从21.93%显着提高到87.15%。此外，与纯壳聚糖薄膜相比，CGTOCNF 的加入提高了复合薄膜的抗氧化性和紫外线阻挡性能。值得一提的是，CGTOCNF部分替代壳聚糖后，所有复合膜均具有优异的抗菌活性。此外，随着CGTOCNF的加入，薄膜的水溶性降低。然而，这项研究表明，CGTOCNF 的加入浓度大于 10% 会导致壳聚糖薄膜的水蒸气阻隔性能和机械强度略有下降。这项工作的结果表明，在壳聚糖薄膜中添加 10% CGTOCNF 可增强其物理和抗菌性能，从而增加其在食品包装中的应用潜力。
Chitosan has attracted much attention for use in antimicrobial food packaging because of its unique antibacterial properties and excellent film-forming ability. However, its poor barrier properties to UV light and high water-solubility limit its application. In this study, modified cellulose nanofiber was incorporated into chitosan films to improve their UV blocking, physical, and antibacterial properties. Modified cellulose nanofiber was obtained by grafting curcumin to 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose. Infrared spectroscopy and X-ray photoelectron spectroscopy results indicated that cellulose was successfully modified. Bio-nanocomposite films composed of chitosan (67–100 wt %) and curcumin grafted TEMPO-oxidized cellulose nanofiber (CGTOCNF, 0–33 wt %) were prepared using the casting method. Scanning electron microscopy images and X-ray diffraction analysis showed that the addition of CGTOCNF noticeably affected the morphology of the composite films, with the crystallinity significantly increasing from 21.93% to 87.15%. Moreover, CGTOCNF incorporation improved the oxidation resistance and UV blocking properties of the composite films compared to pure chitosan films. It is also worth mentioning that all of the composite films have excellent antibacterial activity with CGTOCNF partially replacing chitosan. Furthermore, the water solubility of films decreased with the incorporation of CGTOCNF. However, this study demonstrated that incorporation of CGTOCNF at concentrations greater than 10% resulted in a slight decrease in the water vapor barrier properties and mechanical strength of chitosan films. The findings in this work indicate that the addition of 10% CGTOCNF to chitosan films enhances their physical and antibacterial properties, thus increasing their potential for use in food packaging.