Abstract
Bionic and active films based on chitosan were developed with the bionic structure of dragonfly wings incorporating pine bark extract (PBE). Physicochemical properties of the films, including thickness, opacity, moisture content, color, mechanical properties, and water vapor permeability were measured. Antioxidant activity of the films was characterized by DPPH free radical scavenging activity. The interaction between chitosan and PBE was explored by attenuated total reflectance Fourier transform infrared spectrometry, X-ray diffraction, and differential scanning calorimetry. The results indicated that the addition of PBE gave rise to the films greater opacity, redness, and darker appearance. Compared with pure chitosan film, the thickness, opacity, mechanical properties, and oxidation resistance of the bionic chitosan–PBE film increased, and the water vapor permeability decreased. The films based on chitosan incorporated PBE and with the bionic structure of dragonfly wings can potentially be applied to food packaging.
Highlights
Plastic food packaging materials are mostly non-degradable, resulting in serious environmental pollution
The results suggested that the pure chitosan film was smooth
The results suggested that the pure chitosan film was Figure 2B1 showed that B-0%pine bark extract (PBE) successfully replicated the microstructure of 5 of 11 dragonfly wings with a rough and uneven appearance
Summary
Plastic food packaging materials are mostly non-degradable, resulting in serious environmental pollution. It is necessary to develop biodegradable food packaging films with antibacterial and antioxidant properties [3]. Chitosan possesses various features, such as biodegradability, filmforming properties, and biocompatibility, and becomes one of the research hotspots in food packaging materials [5,6,7]. Active films from chitosan incorporated PBE and with bionic structur of dragonfly wings were developed. The physiochemical, structural, and biological prop erties of the bionic chitosan–PBE film was evaluated. PBE contains a variety of active ingredients, mainly including proanthocyanidins (Figure 1B). Active films from chitosan incorporated PBE and with bionic structure of from. The PBE was brownish red, and the content of proanthocyanidins was ≥ 95%. 2,2
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