Exploring a Sustainable Process for Polyphenol Extraction from Olive Leaves

Descripción del Articulo

Olive leaves are residues from pruning and harvesting and are considered an environmental management problems. Interestingly, these residues contain high polyphenol concentrations, which can be used to treat chronic diseases. However, these compounds are a technological challenge due to their thermo...

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Detalles Bibliográficos
Autores: Huamán Castilla, Nils Leander, Díaz Huamaní, Karla Syndel, Palomino Villegas, Yolanda Cristina, Allcca Alca, Erik Edwin, Colque Ayma, Elvis Jack, Mariotti Celis, María Salomé, León Calvo, Nilton Cesar, Zirena Vilca, Franz
Formato: artículo
Fecha de Publicación:2024
Institución:Universidad Nacional de Moquegua
Repositorio:UNAM-Institucional
Lenguaje:inglés
OAI Identifier:oai:repositorio.unam.edu.pe:UNAM/601
Enlace del recurso:https://repositorio.unam.edu.pe/handle/UNAM/601
https://doi.org/10.3390/foods13020265
Nivel de acceso:acceso abierto
Materia:Olive leaves.
Polyphenols.
Antioxidant capacity.
Pressurized liquid extraction.
Green solvent.
https://purl.org/pe-repo/ocde/ford#2.00.00
Descripción
Sumario:Olive leaves are residues from pruning and harvesting and are considered an environmental management problems. Interestingly, these residues contain high polyphenol concentrations, which can be used to treat chronic diseases. However, these compounds are a technological challenge due to their thermolability and reactivity during extraction. Thus, this study assessed the use of pressurized liquid extraction (PLE) with green solvents like water-ethanol and water-glycerol mixtures (0–15%) at 50 °C and 70 °C to yield polyphenol-rich antioxidant extracts with reduced glucose and fructose content. The use of 30% ethanol at 70°C presented the highest polyphenol content (15.29 mg gallic acid equivalent/g dry weight) and antioxidant capacity, which was expressed as IC50 (half maximal inhibitory concentration): 5.49 mg/mL and oxygen radical absorbance capacity (ORAC): 1259 μmol Trolox equivalent/g dry weight, as well as lower sugar content (glucose: 3.75 mg/g dry weight, fructose: 5.68 mg/g dry weight) compared to water–glycerol mixtures. Interestingly, ethanol exhibits a higher degree of effectiveness in recovering flavanols, stilbenes and secoiridoids, while glycerol improves the extraction of phenolic acids and flavonols. Therefore, to enhance the efficiency of polyphenol recovery during the PLE process, it is necessary to consider its solvent composition and chemical structure.
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