Preparation and Properties of Fe3+-Green Tea Carbon Dots Synergistically Enhanced Hemicellulose/Polyvinyl Alcohol Active Packaging Films

XU Meiyang; ZHANG Hongnan; LYU Yanna; WANG Haisong; LI Dongmei

doi:10.19554/j.cnki.1001-3563.2026.11.001

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (11) : 1-8. DOI: 10.19554/j.cnki.1001-3563.2026.11.001

Special Topic on Functional Biomass Materials

Preparation and Properties of Fe³⁺-Green Tea Carbon Dots Synergistically Enhanced Hemicellulose/Polyvinyl Alcohol Active Packaging Films

XU Meiyang^a, ZHANG Hongnan^a, LYU Yanna^a*, WANG Haisong^a, LI Dongmei^bc

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Abstract

The work aims to develop hemicellulose-based active packaging composite films with barrier, antioxidant and antibacterial functions to overcome the poor barrier property and limited functionality of conventional hemicellulose-based packaging films. Hemicellulose was first subject to carboxymethylation modification and then blended with PVA to form the base film matrix. Green tea carbon dots (GT-CDs) and Fe³⁺ were incorporated to establish a synergistically enhanced composite system. The effects of GT-CDs loading content and Fe³⁺ addition on the microstructure evolution, barrier property, antioxidant activity and antibacterial efficacy of the resulting film were systematically evaluated. The GT-CDs displayed a quasi-spherical morphology with diameters below 5 nm, strong ultraviolet absorption capacity and excitation-dependent fluorescence behaviors. They exhibited remarkable inhibitory effects against both Escherichia coli and Staphylococcus aureus, with inhibition zone diameters of 22.34 mm and 21.3 mm, respectively. At a GT-CDs loading of 2 wt%, the composite film achieved a DPPH radical scavenging rate of 86.65%. With the additional incorporation of 1 wt% Fe³⁺, the DPPH radical scavenging rate further increased to 89.64%, and a complete antibacterial effect (100% inhibition rate) was obtained. Compared with the hemicellulose/PVA film, the composite film co-doped with GT-CDs and Fe³⁺ exhibited oxygen permeability of 5.268 cm³/(m²·d·0.1 MPa) and water vapor permeability of 30.63 g/(m²·24 h), representing reductions of 43.8% and 53.1%, respectively. The synergistic effects between GT-CDs and Fe³⁺, including coordination complexation and interfacial interactions, facilitate the formation of a dense internal structure and optimize the mass transfer pathways within the composite film. Meanwhile, they endow the film with excellent free radical scavenging and antibacterial capabilities, leading to the simultaneous enhancement of barrier, antioxidant and antibacterial properties of the hemicellulose /PVA composite film. KEY WORDS: hemicellulose; green tea carbon dots; antioxidant; packaging film

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hemicellulose / green tea carbon dots / antioxidant / packaging film

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XU Meiyang, ZHANG Hongnan, LYU Yanna, WANG Haisong, LI Dongmei. Preparation and Properties of Fe³⁺-Green Tea Carbon Dots Synergistically Enhanced Hemicellulose/Polyvinyl Alcohol Active Packaging Films[J]. Packaging Engineering. 2026, 47(11): 1-8 https://doi.org/10.19554/j.cnki.1001-3563.2026.11.001

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