Researchers in Poland have developed biodegradable packaging films infused with pollen extract from Cannabis sativa L., showing they can extend the shelf life and protect the quality of grapes.
The study, published in the journal Colloids and Surfaces B: Biointerfaces, tested polysaccharide-based films incorporating cannabis pollen extract as an alternative to conventional petroleum plastics. Thompson seedless grapes were packaged in films containing different concentrations of the extract, then stored for two weeks under controlled light and temperature conditions.
Results showed grapes packaged in films with 0.5% and 1.0% extract concentrations had a steady increase in anthocyanin levels after 8, 11 and 14 days, indicating improved pigment stability. Grapes stored in films with 2.0% extract saw only a small increase in anthocyanins, suggesting higher extract levels stabilized the compounds more effectively by reducing oxidative stress. After 14 days, anthocyanin levels in these grapes remained at 0.51 ± 0.02%.
The protective effect was attributed to the film’s ability to limit exposure to light and oxygen, slowing down degradation and pigment oxidation. In addition, mechanical testing showed that the cannabis-infused films were stronger and provided better barriers against water vapor compared to control samples.
Chemical analysis of the cannabis pollen extract revealed cannabidiol (94.37%) and cannabinol (1.14%) as the dominant compounds, both known for their antioxidant properties. The authors concluded that integrating such extracts into eco-friendly films not only supports circular economy goals but also offers a sustainable way to preserve the visual quality and shelf life of anthocyanin-rich fruits like grapes.
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