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Preparation and Characterization of Pullulan/Carboxymethyl Cellulose/Nano-TiO2 Composite Films for Strawberry Preservation

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Abstract

Biodegradable composite films based on pullulan/carboxymethyl cellulose/nano-TiO2 were prepared using a solution casting method. In this study, the composite films were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and their physical, mechanical and antimicrobial properties were investigated. FTIR and XRD results confirmed that the presence of nano-TiO2 could enhance the interaction between the film matrix. SEM analysis revealed that the composite films had a homogeneous network structure, and good particle dispersion could be obtained when the nano-TiO2 particle content was low. DSC results indicated that the composite films possessed good thermal stability. The incorporation of nano-TiO2 increased the thickness and contact angle while significantly decreasing the water solubility (p < 0.05). As the content of nano-TiO2 increased, the water vapor and ultraviolet visible (UV–Vis) light barrier properties of composite films were significantly improved (p < 0.05). Mechanical analysis demonstrated that the tensile strength of the composite films first increased and then decreased, whereas the elongation at break decreased significantly (p < 0.05). In addition, the composite films exhibited excellent activity against Escherichia coli and Staphylococcus aureus mainly due to the inactivation of bacteria by nano-TiO2 photocatalysis. Preservation experiments showed that the composite films could decrease the weight loss significantly and maintain the firmness, titratable acidity, vitamin c and skin color of strawberries, thereby improving the overall quality of strawberries and extending their shelf life. This finding suggested that pullulan/carboxymethyl cellulose/nano-TiO2 composite films possessed excellent potential for application in food packaging.

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Acknowledgements

This work was financially supported by the National Key R&D Program in the 13th Five-Year Project of China: Research, Development, and Demonstration of the Technology for Ecological Sustainability of Typical Mountain Vegetable Resources in Forests of Northeast China [2016YFC0500307]; and Young Talents Project of Northeast Agricultural University [grant no. 206-54980112].

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Authors and Affiliations

  1. College of Food Science, Northeast Agricultural University, Changjiang Road 600, Xiangfang District , Harbin, 150030, People’s Republic of China

    Xiuling Zhang, Zhen Li, Run Ji, Kun Li & Wentao Zhang

Authors
  1. Xiuling Zhang
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  2. Zhen Li
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  3. Run Ji
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  4. Kun Li
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  5. Wentao Zhang
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Contributions

Xiuling Zhang: Conceptualization, Methodology, Data curation, Formal analysis, Writing-original draft, Writing-review & editing, Funding acquisition, Supervision; Zhen Li: Conceptualization, Investigation, Methodology, Resources, Software; Run Ji: Investigation, Software; Kun Li: Investigation, Resources; Wentao Zhang: Project administration, Funding acquisition, Supervision.

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Correspondence to Wentao Zhang.

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Highlights

1. A novel biodegradable film (pullulan/carboxymethyl cellulose/nano-TiO2) was fabricated via casting method.

2. The addition of nano-TiO2 improved the mechanical and structural properties of the composite films.

3. The composite films had good water vapor barrier, UV blocking properties and antibacterial properties.

4. Preservation experiments showed that the composite films could improve the overall quality of strawberries and extend their shelf life.

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Zhang, X., Li, Z., Ji, R. et al. Preparation and Characterization of Pullulan/Carboxymethyl Cellulose/Nano-TiO2 Composite Films for Strawberry Preservation. Food Biophysics 16, 460–473 (2021). https://doi.org/10.1007/s11483-021-09684-w

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  • DOI: https://doi.org/10.1007/s11483-021-09684-w

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