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Orange peel waste biorefinery in multi-component cascade approach: Polyphenolic compounds and nanocellulose for food packaging

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Author
Espinosa, Eduardo
Rincón, E.
Morcillo-Martín, Ramón
Rabasco-Vílchez, Laura
Rodríguez, A.
Publisher
Elsevier
Date
2022
Subject
Orange peel
Bioactive extract
Nanocellulose
Active packaging
Waste valorization
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Abstract
This study proposed an efficient valorization of orange peel waste (OPW) thorugh a multi-product cascade biorefinery approach. In a first step, polyphenolic-rich bioactive extract was obtained using 100% ethanol after a suitability study of different solvent systems. Its use in ultrasound-assisted extraction at 80 °C also allowed obtaining bioactive extracts with higher characteristics and reducing the extraction time (30 min) compared to conventional extraction (5 h). The extractives free-OPW was then used to obtain nanocellulose with high yield (>70%), solely by subjecting the fiber to a high-pressure homogenization treatment without the need for additional pretreatments, highlighting the efficiency of the process. The different components obtained were used separately and together on poly(vinyl alcohol)-based (PVA) films to study the isolated and synergistic effect they contributed to the properties of the films. The optimum cellulose nanofibers (CNF) content was found to be 5%, at higher contents a tendency to clustering of the nanofibers in the matrix was observed. The addition of polyphenol-rich extracts conferred interesting bioactive properties of special interest for food packaging. The antioxidant properties of the films increased as the extract content in the formulation increased, reaching almost 100% for an extract content of 30%. Also, UV-light blocking capacity was increased reaching values of 100% for extract contents above 20%. The synergistic effect of the joint addition of CNF and polyphenols resulted in bioactive films with high UV-blocking capacity that maintained the structural and mechanical properties of pure PVA films. Regarding the antioxidant capacity, a more controlled release action is observed. These results evidenced that the synergistic effect between bioactive extracts and CNF could be an excellent enhancer of the active packaging.
URI
http://hdl.handle.net/10396/27131
Fuente
Espinosa, E., Rincón, E., Morcillo-Martín, R., Rabasco-Vílchez, L., & Rodríguez, A. (2022). Orange peel waste biorefinery in multi-component cascade approach: polyphenolic compounds and nanocellulose for food packaging. Industrial Crops and Products, 187, 115413. https://doi.org/10.1016/j.indcrop.2022.115413
Versión del Editor
https://doi.org/10.1016/j.indcrop.2022.115413
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