| Title | Exploring the Valorisation Potential of Tomato Cultivation By-Products in the Frame of Circular Economy |
|---|---|
| ID_Doc | 5470 |
| Authors | Panagiotopoulou, M; Papadaki, S; Missirli, T; Thanassoulia, I; Krokida, M |
| Title | Exploring the Valorisation Potential of Tomato Cultivation By-Products in the Frame of Circular Economy |
| Year | 2022 |
| Published | Waste And Biomass Valorization, 13, 9 |
| Abstract | Purpose Tomato waste (leaves, stems, green and red fruit) containing valuable bioactive compounds was used for the creation of ground cover films. Methods The extraction methods for the recovery of the bioactive extracts, were ultrasound and microwave assisted extraction (UAE-MAE). Extraction yield, antioxidant activity, total phenolic, flavonoid, protein and glycoalkaloids content of the extracts were evaluated using standard protocols. Subsequently, the extracts were encapsulated with the electrospinning process into zein (ZN) and polylactic acid (PLA) nanofibers and their physicochemical properties were characterized. The best encapsulation product was utilised as an extra layer on low density polyethylene (LDPE) for the creation of an advanced ground cover film. The final film was evaluated regarding its mechanical properties and the release rate of the extracts when exposed to different humidity and temperature conditions. Results Stem and leaf extracts, especially from 72 h maceration and UAE for 20 min had the highest bioactive content and were chosen as the core material with electrospinning. Encapsulation led to physical inclusion of the extracts and thermally stable nanofibers, with zein showing a higher glass transition temperature and water resistance. The ZN nanofibers were, finally, synthesized on LDPE film and the product showed high tensile strength and elongation while 18 and 20% extract release occurred after 30 days at 25 and 45 degrees C respectively, at a relative humidity (RH) of 95%. Conclusions Tomato waste proved to be rich in bioactive compounds that could be exploited for the creation of advanced ground cover films for hydroponic tomato crops in the framework of the circular economy. [GRAPHICS] . |
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