SMART AND SUSTAINABLE PACKAGING MATERIALS FOR POST-HARVEST AROMA PRESERVATION IN RASPBERRIES

Innovative materials and packaging technologies are essential tools in extending shelf life and reducing post-harvest losses of fresh produce. This study, conducted within the EU Horizon 2020 SISTERS project (GA Nº101037796), investigates the role of biodegradable and smart packaging in preserving the chemical integrity of raspberries—one of the most perishable fruits in the market. Three raspberry cultivars (Dafne, Lagorai, Experimental) were stored under two packaging conditions: (i) a standard plastic clamshell (STD) and (ii) a novel biodegradable clamshell developed within the SISTERS project (SIS). Volatile organic compounds (VOCs), which are critical to aroma and consumer perception, were analyzed using Gas Chromatography–Mass Spectrometry (GC-MS) and Proton Transfer Reaction–Time-of-Flight–Mass Spectrometry (PTR-ToF-MS) on days 1, 3, 6, and 9 of storage. Multivariate statistical analysis (PCA) revealed that packaging type significantly influences the evolution of raspberry VOC profiles both from PTR-ToF-MS and GC-MS. The SIS packaging preserved a more stable chemical fingerprint over time, while the STD packaging was associated with accelerated oxidative degradation. Key compounds—such as limonene, acetic acid, (E)-2-hexenal, 2-nonanone, and nonanal—served as markers of freshness and indicators of senescence and microbial activity. Importantly, significant differences were also observed among the three raspberry cultivars, indicating varietal influence on volatiles stability and packaging response. Furthermore, the application of PTR-ToF-MS enabled rapid, non-destructive VOC profiling, demonstrating potential for real-time quality monitoring. This work highlights how advanced packaging materials—particularly those that are biodegradable or sensor-ready—can actively contribute to maintaining aroma, reducing waste, and improving the overall quality of soft fruits. The results offer valuable insights for industry stakeholders aiming to implement sustainable and effective preservation solutions, positioning packaging innovation as a key enabler in future food systems.