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In the direct system, oil vials were covered with control and lignin-doped films and kept in the dark at a temperature of 40 °C, whereas in the indirect system, glass vials containing oil were kept under normal commercial illumination.
Both of the lignins employed in the direct contact system with soybean oil resulted in significantly decreased PV during storage when compared to the control (packing method without lignin film).
Modified biopolymeric film with lignin was applied to the inner layer of food packaging systems to improve some aspects of their performance during storage.
This was accomplished by preventing the migration of chemical compounds from the package to the food as well as by the packaging system’s capacity to scavenge free radicals and block ultraviolet light.
The Global Lignin-based packaging market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
For paper-based green packaging, a lignin-based PU coating was developed. To make the coatings, two typical diisocyanates were employed. The TDI system’s physical characteristics peaked below its 40% lignin concentration as a result of the stiff aromaticity.
When the coating’s brittleness was reduced and the lignin level exceeded 50%, HDI with flexible aliphatic chains also demonstrated physical benefits. The coating has improved thermal stability as a result of its high lignin content.
Coated paper has a 126% increase in dry tensile strength after being coated with lignin-based PU coatings. Surprisingly, a roughly 40-fold improvement allowed the wet strength to rise from 0.31 to 12.6 MPa.
The introduction of Ag+ into the PU matrix, which was based on the coordination of lignin, gave the coating exceptional antibacterial properties. E. coli and S. aureus both had less than 1 colony forming units each.
Nevertheless, there was no inhibitory halo visible, indicating that the Ag was firmly fixed on the coating and that the antibacterial capacity is only present when the bacteria come into contact with the coated surface.
The lignin-based PU coating has considerable potential for use in paper-based green packaging due to its positive sustainability and characteristics.
The produced PU coating with a high lignin content and a solidly embedded Ag+ has exceptional physical, thermal, and antibacterial capabilities, making it a prime option for application in paper-based green packaging.
