We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
pH-responsive active packaging based on chitosan films embedded with grape skin anthocyanins/ thymol nanoparticles: Preparation, characterization, and pork preservation application
AI summary Read the abstract
Scientists created a smart food wrapping made from natural ingredients (grape skin extract, thyme oil, and crab-shell fiber) that changes color when meat starts to spoil, so you can tell at a glance if it's still safe to eat. In tests, this packaging kept pork fresh over 24 hours longer than usual and fought off common bacteria like E. coli, all while offering a plant-based alternative to conventional plastic packaging.
In response to the environmental pollution caused by traditional plastic packaging and the need for real-time monitoring of food freshness, we developed a pH-responsive active packaging film loaded with nanoparticles. Using an antisolvent precipitation method, grape skin anthocyanin (GSA) was entrapped in the hydrophobic core of zein and thymol was adsorbed onto zein surface, followed by the coating of a protective outer layer of pullulan, successfully preparing GSA-zein-thymol-pullulan (GZTP) nanoparticles. Upon incorporation of the GZTP nanoparticles into a chitosan (CS) matrix, the performance of the resulting composite films (GZTP-CS) was significantly enhanced. The nanoparticles exhibited good interfacial compatibility with CS via intermolecular hydrogen bonding, and the mechanical properties were significantly enhanced (tensile strength increased from 7.48 MPa to 27.57 MPa, and elongation at break increased from 35.05% to 112.05%), whilst simultaneously improving the films' hydrophobicity, barrier properties and thermal stability. The composite films exhibited excellent antioxidant activity (57.13% DPPH and 85.02% ABTS+ radical scavenging), coupled with potent antibacterial effects (nearly 100% inhibition against Escherichia coli and 93.44% against Staphylococcus aureus). The films exhibited visually discernible color changes in response to pH, ammonia and acetic acid, turning from grey to blue-green in alkaline environments and from grey-purple to bright purple-red in acidic environments. In applications for preserving pork at 25 °C, the GZTP-CS films not only extended the shelf life by more than 24 h but also provided a real-time, intuitive indication of pork freshness through a color change, thereby demonstrating their potential for application in the field of smart food packaging.
More Papers Like This
Upcycling grapefruit peel pectin, curcumin, and Zn-CD into a high-performance biodegradable film for meat preservation and colorimetric freshness tracking
AI summary Read the abstract
Scientists turned grapefruit peel (usually thrown away) into a smart food wrap that keeps meat fresher longer and changes color as a built-in "freshness alarm," turning yellow to reddish-brown when pork starts to spoil. Unlike regular plastic wrap, this film breaks down naturally in soil, offering a step toward cutting plastic waste and the microplastics that come with it, while also helping shoppers spot spoiled meat before it becomes a food safety risk.
Intelligent Biopolymer-Based Films: Promising New Solutions for Food Packaging Applications
AI summary Read the abstract
This review examines next-generation biopolymer films embedded with smart indicators—such as pH-sensitive dyes, gas sensors, and antimicrobial agents—that can actively monitor food freshness and extend shelf life. These intelligent packaging materials offer a biodegradable alternative to conventional petroleum-based plastics while adding functional value through real-time spoilage detection. The authors assess current material performance, scalability challenges, and the regulatory landscape for commercial adoption.
Advancements in Chitosan–Anthocyanin Composite Films: Sustainable Food Preservation with Biodegradable Packaging
AI summary Read the abstract
This review covers recent progress in developing biodegradable food packaging made from chitosan (derived from shellfish) combined with anthocyanins (plant pigments), which can preserve food freshness while avoiding the microplastic contamination associated with traditional plastic packaging. These films have antibacterial and antioxidant properties and can even change color to indicate food spoilage, offering a promising alternative to single-use plastics.
Research progress on plant polysaccharide-based intelligent-responsive films: Substrates, forming mechanisms, preparation methods, response types, and applications in food preservation
AI summary Read the abstract
Scientists are developing plant-based "smart" food wraps that change color to warn you when meat, seafood, or produce is starting to spoil—no more guessing if food is still safe to eat. Made from plant starches and fibers instead of petroleum-based plastics, these films could help cut down on both food waste and microplastic pollution that ends up in our food and bodies. This review paper summarizes the current science on how these films are made and used, while noting that researchers still need to improve their durability and lower production costs before they show up on store shelves.
Development and characterization of active gelatin-chitosan packaging incorporated with guava leaf extract for extending meat shelf life
AI summary Read the abstract
Researchers developed active food packaging films made from gelatin and chitosan incorporating natural antimicrobial agents, evaluating their barrier properties, mechanical strength, and ability to extend food shelf life. The bio-based packaging showed effective antimicrobial activity and reduced food spoilage compared to untreated films.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.