Two-step pressurized liquid extraction: sustainable recovery of phenolic antioxidants and high-purity limonene from orange peel waste
This study presents a novel biorefinery approach for the sustainable valorization of orange peel waste using pressurized liquid extraction (PLE) to selectively recover phenolic compounds and limonene. A consecutive two-step PLE strategy was developed, employing water for polyphenol extraction follow...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad de Alcalá (UAH) |
| Repositorio: | e_Buah Biblioteca Digital Universidad de Alcalá |
| Idioma: | inglés |
| OAI Identifier: | oai:ebuah.uah.es:10017/65805 |
| Acceso en línea: | http://hdl.handle.net/10017/65805 https://dx.doi.org/10.1016/j.scp.2025.102117 |
| Access Level: | acceso abierto |
| Palabra clave: | Orange peel Sustainable extraction Pressurized liquid extraction Phenolic compounds Limonene Waste valorization Química Chemistry |
| Sumario: | This study presents a novel biorefinery approach for the sustainable valorization of orange peel waste using pressurized liquid extraction (PLE) to selectively recover phenolic compounds and limonene. A consecutive two-step PLE strategy was developed, employing water for polyphenol extraction followed by ethyl acetate for limonene recovery. To maximize extraction efficiency and purity, a Box-Behnken design was employed to optimize temperature and extraction time of the two consecutive extractions. The optimal PLE extraction conditions were determined as 100 °C for aqueous extraction and 125 °C for ethyl acetate extraction, with 9 min per process. The first extraction involved three static cycles, while activated carbon was incorporated in the second step to minimize carotenoid co-extraction, yielding high-purity limonene. The aqueous extract was rich in flavanones, known for their antioxidant and health-promoting properties, while the ethyl acetate extract contained high-purity limonene, free from other volatiles or terpenes. Given its bioactive potential, limonene has applications in food, cosmetics, and as a bio-based alternative to petroleum-derived monomers in biopolymers. This optimized PLE process provides a rapid, efficient, and environmentally friendly alternative to conventional extraction techniques, supporting the circular economy by transforming agri-food waste into high-value bioactive compounds for food, nutraceutical, cosmetic, and biopolymer industries. |
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