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    Chitosan films plasticized with choline-based deep eutectic solvents: UV shielding, antioxidant, and antibacterial properties
    (Elsevier Sci Ltd, 2023) Yu, Jiahao; Xu, Shanlin; Goksen, Gulden; Yi, Caifu; Shao, Ping
    Deep eutectic solvents (DES) as plasticizers of chitosan film show great potential for food packaging. This paper introduced some novel antioxidant and antibacterial films based on chitosan and DES consisting of choline chloride (ChCl) and organic acids. The effects of the composition and contents of choline-based DES on struc-tures, mechanical properties, thermal stability, contact angle, optical, antioxidant and antibacterial properties of chitosan films were studied. FTIR analysis showed that choline-based DES did exist in the chitosan film with good polymer matrix compatibility. Most of the films exhibited uniform, flat surfaces and cross sections. The Young's modulus of the films decreased inversely to the level of choline-based DES, and maximal mechanical charac-teristics were achieved for films plasticized with ChCl and acetylsalicylic acid. The addition of choline-based DES apparently reduced water contact angles, decreased the decomposition temperature and the thermal stability of chitosan films. In terms of antioxidant capacities and ultraviolet (UV) shielding, chitosan films plasticized with choline-based DES containing acetylsalicylic acid and vitamin C had strong UV shielding and antioxidant properties. Chitosan films plasticized with choline-based DES containing acetylsalicylic acid, malonic acid and lactic acid showed excellent antibacterial properties against Escherichia coli and Staphylococcus aureus. In conclusion, the chitosan film with the choline-based DES, especially for ChCl and acetylsalicylic acid showed a good application prospect in food active packaging.
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    High-sensitivity intelligent packaging films harnessing rose anthocyanins and hydrophilic silica aerogel for visual food freshness monitoring
    (Oxford Univ Press, 2024) Wu, Wenjun; Zheng, Luman; Yu, Jiahao; Liu, Liming; Goksen, Gulden; Shao, Ping
    The enhancement of the sensitivity for anthocyanin-based indicator films in food freshness monitoring in real time is important for application. In this study, hydrophilic silica aerogel (SiO2NA) was incorporated into corn starch (CS)/chitosan (CH)/rose anthocyanins (RACNs)-encapsulated potato amylopectin nanoparticles (APNPs) composite film to increase the sensitivity for shrimp freshness detection. The microstructure of films revealed that the gas absorption capacity was improved by amorphous SiO2NA via hydrogen interactions. The pore size (1.74-5.60 times), pore volume (3.92-5.60 times), and specific surface area (2.21-2.34 times) of films increased with the addition of SiO2NA. The sensing of NH3 and pH and the reversibility of films were also reinforced. Meanwhile, the pH-responsive films containing SiO2NA changed visibly in color from purple-red to orange-gray and finally to gray, enabling effective monitoring of shrimp freshness during storage at 4 degrees C. Thus, anthocyanin-based indicator films with improved sensitivity by adding SiO2NA were successfully designed for monitoring shrimp freshness.