Preparation and Properties of Chitosan-based Nanocomposite Antimicrobial Films for Food Preservation

XIONG Weibin; YI Yanjie; HUANG Shaoyun

doi:10.19554/j.cnki.1001-3563.2026.11.007

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (11) : 61-70. DOI: 10.19554/j.cnki.1001-3563.2026.11.007

Special Topic on Functional Biomass Materials

Preparation and Properties of Chitosan-based Nanocomposite Antimicrobial Films for Food Preservation

XIONG Weibin¹, YI Yanjie^2*, HUANG Shaoyun²

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Abstract

The work aims to construct a composite film system for fruit and vegetable preservation that integrates efficient antibacterial activity with active regulation functions by synergistically exploiting the intrinsic antimicrobial properties of chitosan and the photocatalytic activity of nano-TiO₂, to achieve effective modulation of postharvest physiological processes in fruits and vegetables, and ultimately provide both theoretical foundations and technical support for the development of safe, efficient preservation materials with dual protective functions, thereby promoting their practical application in the field of postharvest storage and preservation of fruits and vegetables. Based on the catalytic antibacterial properties of nano-TiO₂ and the inherent antibacterial and preservative effects of chitosan (CS), a composite film was prepared with chitosan hydrochloride (CSH), rutile-type nano-TiO₂, and anatase-type nano-TiO₂ as primary raw materials. The film's microscopic structure, optical transmittance, mechanical properties, water vapor permeability, antibacterial performance, and preservation efficacy were tested and analyzed. Experimental results showed that all four films exhibited good film-forming effects and excellent mechanical properties. The CSH composite film containing nano-TiO₂ displayed a granular surface texture, reduced transparency, significantly improved elongation at break, enhanced light absorption, and elevated photocatalytic antibacterial performance. Meanwhile, when the film was applied to citrus fruits preservation, it was found that the composite film exhibited excellent photocatalytic sterilization and preservation effects on citrus fruits. After storage for up to 50 days, varying degrees of decay spots were observed on the surface of citrus fruits in both the experimental and control groups. Meanwhile, gradual moisture loss occurred, accompanied by an increase in weight loss rate. Notably, the citrus fruits treated with preservative films containing nano-TiO₂ exhibited a reduced rate of weight loss after 14 days of storage, indicating that the coating effectively inhibited moisture evaporation and outward diffusion from the citrus fruits. These results suggested that the incorporation of nano-TiO₂ exerted a positive effect on the preservation of citrus fruits. By incorporating nano-TiO₂ with photocatalytic active antibacterial properties, a dual-protection preservative film can be constructed based on the inherent antibacterial and protective functions of chitosan, offering promising applications in the field of fruit and vegetable storage and preservation.

Key words

nano-TiO₂ / chitosan / composite film / preservation / antibacterial properties

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XIONG Weibin, YI Yanjie, HUANG Shaoyun. Preparation and Properties of Chitosan-based Nanocomposite Antimicrobial Films for Food Preservation[J]. Packaging Engineering. 2026, 47(11): 61-70 https://doi.org/10.19554/j.cnki.1001-3563.2026.11.007

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