Castillo-Luna, A.; Miho, H.; Ledesma-Escobar, C.A.; Priego-Capote, F. Comparison of Drying Techniques for Extraction of Bioactive Compounds from Olive-Tree Materials. Foods2023, 12, 2684.
Castillo-Luna, A.; Miho, H.; Ledesma-Escobar, C.A.; Priego-Capote, F. Comparison of Drying Techniques for Extraction of Bioactive Compounds from Olive-Tree Materials. Foods 2023, 12, 2684.
Castillo-Luna, A.; Miho, H.; Ledesma-Escobar, C.A.; Priego-Capote, F. Comparison of Drying Techniques for Extraction of Bioactive Compounds from Olive-Tree Materials. Foods2023, 12, 2684.
Castillo-Luna, A.; Miho, H.; Ledesma-Escobar, C.A.; Priego-Capote, F. Comparison of Drying Techniques for Extraction of Bioactive Compounds from Olive-Tree Materials. Foods 2023, 12, 2684.
Abstract
Olive tree vegetal materials are considered a powerful source for isolation of bioactive compounds, mainly, phenols and triterpenic acids. However, the high humidity content of them reduces their preservation and extractability to a liquid solvent. Accordingly, a drying step is crucial to homogenize the material and to obtain an efficiency extraction. We studied the influence of the drying process on the extraction efficiency of bioactive compounds from olive vegetal material. For this purpose, we evaluated the effects of four drying processes on the solid–liquid extraction of bioactive compounds from two by-products, olive leaves and pomace, and olive fruits harvested from two cultivars, Alfafara and Koroneiki. Infrared-assisted drying (IAD) was the most suited approach to obtain extracts enriched in oleuropein from leaves. In the case of pomace, lyophilization and microwaves-assisted drying led to extracts concentrated in oleacein and oleuropein aglycone, whereas IAD and oven-drying led to extracts with enhanced content in hydroxytyrosol glucoside and hydroxytyrosol, respectively. The drying process affected considerably to the chemical composition of extracts obtained from fruits. Changes in the composition of extracts were explained essentially by the drying process conditions using auxiliary energies, temperature and time, which promoted chemical alterations and increased the extractability of compounds.
Chemistry and Materials Science, Analytical Chemistry
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