Search

Chlorine dioxide (ClO 2 ) exhibits promising potential for the application in food preservation. However, the large-scale production of controlled-release ClO 2 films faces challenges. The sodium chlorite microcapsules (Micro-SC) were successfully prepared in this study using polyvinyl alcohol (PVA) as the wall material through the spray drying method. Furthermore, A large-scale preparation of temperature and humidity dual-responsive ClO 2 controlled-release films (Micro-SC@EVA) was achieved using melt extrusion. The film could release ClO 2 triggered by water vapor for 36 days. The antibacterial effects were significantly enhanced with the increase of microcapsule ratio from 4 % to 8 %. The Micro-SC@EVA film reduced the total viable count and wight loss of strawberries, inhibits ethylene production, and extended the shelf life of by 150 % compared with the control group at 25 °C. The application evaluation results show that the novel approach for the large-scale preparation of ClO 2 controlled-release film holds significant implications for food packaging., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Fresh strawberries are easily contaminated by microorganisms after picking. Therefore, how to effectively store and keep fresh strawberries has been a hot topic for scientists to study. In this study, we prepared a leaf shaped metal organic framework nanomaterial loaded with quercetin (Quercetin@ZIF-L) at first, which can achieve effective loading of quercetin (96%) within 45 min and has a controlled release effect under acidic conditions. In addition, by cleverly combining satellite graphene oxide @ silver nanoparticles (GO@AgNPs) with slow precipitation performance, Quercetin@ZIF-L/GO@AgNPs nanocomposite film with larger pore size and larger specific surface area was prepared by scraping method. The characterization data of water flux, retention rate, flux recovery rate and water vapor permeability show that the composite film has good physical properties. The experiment of film packaging showed that the fresh life of strawberry could be extended from 3 to 8 days, which significantly improved the storage and freshness cycle of strawberry. At the same time, the metal migration test proved that the residual amount of silver ion in strawberry met the EU standard and zinc ions are beneficial to the health, enriching the types of high-performance fresh-keeping materials and broadening the application., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

In this study, multifunctional green carbon dots (CDs) have been synthesized using Galla chinensis waste (GCW) via hydrothermal method for the first time. An active packaging film has been developed in this work by combining CDs and pullulan (PL), using the solution-casting method. The microscopic morphology revealed that the CDs that were prepared using GCW exhibited good compatibility with PL. In addition, it also led to improvement in the toughness of the PL film (14.01 % to 20.26 %), along with its water vapor permeability value [1.31 to 0.53 (g·mm)/(kPa·h·m 2 )]. The composite films consisting of CDs exhibited good UV blocking rates for the UVA (90.41 %-7.87 %), UVB (87.76 %-0.08 %), and UVC (83.39 %-0 %) spectral ranges. The composite films exhibited strong antioxidant activity, and the clearance of ABTS and DPPH were obtained to be 93.61 % and 86.30 %, respectively. In addition, the composite films showed good antibacterial activity for E. coli and S. aureus, with a high antibacterial rate of up to 99.99 %. Finally, the non-contact preservation of strawberries over a duration of 10 d at room temperature confirmed that the prepared composite film can help preserve the quality of strawberries, as well as extended their shelf-life., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)

Recently, chitosan film has been widely used to extend the shelf life of food. In this study, high, medium and low molecular weight of chitosan were used as raw materials to prepare a series of films (C1-C27) by controlling the content of chitosan and glycerol, and their mechanical properties, water vapor permeability (WVP), oxygen transmittance (OP), morphology and antibacterial properties were characterized as well. The results indicated that all films had film-forming properties. Among them, the film C16 with high molecular weight, high chitosan content and 50% glycerol/chitosan (w/w) exhibited the excellent transparency (91.2%), elongation at break (28.948%), tensile strength (77.963 MPa), WVP (1.46 × 10 -12 gcm/cm 2 ·sPa), smooth morphology, denser structure and antibacterial property (Staphylococcus aureus and Escherichia coli). Meanwhile, the preservation properties of chitosan films were evaluated by strawberry preservation. Almost all the studied films had better preservation effect than the commercially available PE films, especially of which the film C16 was the best compared with others. It maintained the physical and chemical parameters (weight loss ratio, total soluble solids, titratable acidity, total ascorbic acid and color change) of strawberry most obviously. Hence, chitosan films had great potential for the industrial application of fruit preservation., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier B.V. All rights reserved.)

[Display omitted] • Date palm fruit waste extract (DPFW) loaded chitosan (Cs)/polyethylene glycol (PEG) biofilm was prepared. • DPFW extract displayed an impressive suppression effect against the identified pathogens in antimicrobial experiments. • As fresh strawberries were preserved using Cs/PEG packaging loaded with extract for 10 days. • The present findings imply that DPFW-3@Cs/PEG material can be successfully used to pack perishable fruits and vegetables. In light of the global concern that calls for the safe disposal of waste polluting the environment and its exploitation in adding many distinctive products that can be used practically, this study was conducted to clarify how to make the best use of such waste. Therefore, the presented research aims to eliminate these residues and use their extracts as antimicrobial materials that can be used for films/membranes preparation for food and fruit preservations with low economic feasibility. Based on that, the aim of our work was planned to prepare films of date palm fruit waste extract (DPFW) loaded chitosan (Cs)/polyethylene glycol (PEG) composite. The extract was added to the polymers mentioned above with three different concentrations to prepare three film samples (DPFW-1@Cs/PEG), DPFW-2@Cs/PEG and DPFW-3@Cs/PEG). All these films were compared with those prepared without DPFW (DPFW-0@Cs/PEG). The film solutions films were cross-linked using glyoxal as a crosslinker before films formation. The finding illustrated that, the surface structure of DPFW-loaded Cs/PEG became rough, and the extract was remarkably seen on the surface of Cs/PEG films. In addition, the water contact angle for all fabricated films revealed that the films are hydrophobic in nature. The thermal stability of Cs/PEG films were enhanced with the addition of DPFW. The DPFW extract displayed an impressive suppression effect against the identified pathogens in antimicrobial experiments. As fresh strawberries were preserved using Cs/PEG film loaded with DPFW for 10 days, it was discovered that the strawberry wrapped in the extract-containing films maintained their freshness superior to those wrapped in unloaded material. Such films have a wide range of potential applications in food packaging to extend the longevity of freshly prepared goods due to their simplicity and solid biocidal ability. The present research's findings imply that DPFW-3@Cs/PEG material can be successfully used to pack perishable fruits and vegetables. [ABSTRACT FROM AUTHOR]

Strawberries are a widely consumed fruit that contains a variety of antioxidant metabolites. However, postharvest strawberries are highly perishable and susceptible to a variety of fungal pathogens. In this study, a chitosan-based coating containing turmeric (TU) and green tea (GT) extracts was developed and evaluated for the preservation of strawberries. Both TU and GT extracts contained high phenolic contents (>5.8 g kg−1 dry weight), but only TU extract showed strong antifungal activity. SEM observations revealed that high concentrations of extract (3–5% v/v) caused the formation of agglomerates within the films, reduced elongation at break and increased tensile strength. The postharvest treatment of strawberries with chitosan coating containing TU extract inhibited the proliferation of Botrytis cinerea during 7 d of storage at 20 °C, whereas the coating containing GT extract extended the antioxidant properties of postharvest strawberries from 4 to 8 d at 20 °C. Sensory analysis indicated that the coatings did not significantly affect flavor and taste. Overall, TU extract was used for the first time for food packaging purposes and proved to be a great complement to the antioxidant properties of GT to extend the shelf-life of postharvest strawberries. • Chitosan-based films containing turmeric and green tea extracts were evaluated. • Turmeric extract addition improved the antifungal activity against B. cinerea. • Green tea extract addition enhanced the antioxidant capacity of the film. • The tensile strength of the film increased after adding the extracts. • The developed films extended the shelf-life of postharvest strawberries. [ABSTRACT FROM AUTHOR]

Antimicrobial packaging based on biodegradable material is a novel strategy to ensure food safety without posing threats to the environment. In this study, poly(lactic acid) (PLA) nanofibers containing Ethyl-Nα-dodecanoyl- l -arginate hydrochloride (LAE) were fabricated using the electrospinning method. The microstructure, inter-molecular interaction, thermal stability, and antimicrobial properties of electrospun films were characterized. The LAE embedded nanofibers had an average diameter of 325–364 nm, which was 43.5%–49.5% thinner compared to the neat PLA nanofibers. The active films demonstrated outstanding antimicrobial capability against Escherichia coli O157:H7, Staphylococcus aureus, and Botrytis cinerea. The active films with LAE could also effectively extend the shelf-life of strawberries at 25°C, suggesting that PLA films incorporating with LAE could be used as an environmental-friendly antimicrobial packaging material. • Uniform and bead-free nanofibers enriched with LAE were obtained by electrospinning. • The LAE/PLA films showed significant antimicrobial effects against E.coli O157:H7, S.aureus and B. cinerea. • The films with 2% LAE could effectively extend the shelf-life of strawberries stored at 25 °C. [ABSTRACT FROM AUTHOR]