Background
Developing advanced intelligent and active packaging to prevent food quality deterioration and contamination is of great significance. Responsive packaging, which aims to monitor/improve food safety or quality through pH, temperature, biogenic gas, or light stimulation, has attracted extensive attention. Compared with other stimuli, light-responsive technology provides an appealing approach for developing highly precise and contactless intelligent and active food packaging.
Scope and approach
This work systematically describes the mechanisms of light-responsive packaging functionalized with various light-responsive materials and compounds, including natural organic compounds, synthetic organic compounds, carbon-based materials, metal oxides, and hybrid complexes. Meanwhile, the application progress of light-responsive packaging within food-related fields is emphasized. Additionally, the current limitations and challenges associated with light-responsive food packaging are discussed, and potential future research directions and development trends are proposed.
Key findings and conclusions
Light-responsive packaging, operating through mechanisms including photoluminescence, photochromism, photocatalysis, photo-controlled release, photothermal conversion, and reflection/scattering, not only offers innovative strategies for intelligent packaging, such as freshness/safety indicators and anti-counterfeiting labels, but also demonstrates excellent performance in antimicrobial activity, gas scavenging, controlled release, and photosensitive product protection. However, commercialization obstacles exist such as the migration of photosensitive compounds, light/heat instability of photosensitive dyes, and high cost of synthesizing advanced materials. Overcoming these challenges require advances in material innovation and manufacturing, supported by cross-disciplinary technologies such as artificial intelligence (AI) and intelligent sensing. Overall, this review presents a comprehensive summary of recent advances in light-responsive food packaging and offers theoretical insights and technical guidance to facilitate its broader application.


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