Enhancing UV Protection with Tyrosine-Thiourea Carbon Dots (TT-CDs) in Polyvinyl Alcohol Films: A Novel Food Packaging Materials
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Nowadays food packaging materials are a growing industry to extend shelf life and monitor food quality. Researchers are developing a variety of materials for the food packaging industry. For the past few years, carbon dot-based materials have been used in conjunction with polymer composites to create thin, transparent active food packaging films. The presence of carbon dots in polymer composite films makes sense for active food monitoring, UV light barrier, and antibacterial as well as antioxidant packaging materials. In this work, we synthesize Tyrosine-Thiourea-based carbon dots having a strong UV light-blocking capacity which leads into extend the shelf life of food. Carbon dots are synthesized by hydrothermal method using Tyrosine and Thiourea in the 1:1 proportion at optimized reaction conditions. The resultant carbon dot successfully 100% blocks the UV-C (200-280 nm) and UV-B (280-320 nm) regions and around 80% of UV light blocks from the UV-A (320-400 nm) region. Synthesized carbon dots have a size of 5-20 nm.