Solid State Fermentation of Olive Leaves as a Promising Technology to Obtain Hydroxytyrosol and Elenolic Acid Derivatives Enriched Extracts
Metadatos
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Starzynska Janiszewska, Anna; Fernández Fernández, Carmen; Martín García, Beatriz; Verardo, Vito; Gómez Caravaca, Ana MaríaEditorial
MDPI
Materia
Olive leaves Phenolic compounds Hydroxytyrosol Antioxidant activity
Fecha
2022-08-29Referencia bibliográfica
Starzynska-Janiszewska, A... [et al.]. Solid State Fermentation of Olive Leaves as a Promising Technology to Obtain Hydroxytyrosol and Elenolic Acid Derivatives Enriched Extracts. Antioxidants 2022, 11, 1693. [https://doi.org/10.3390/antiox11091693]
Patrocinador
Ministry of Science and Innovation, Spain (MICINN) Instituto de Salud Carlos III Spanish Government RTI2018-099835-A-I00 MCIN/AEI/10.13039/501100011033/FEDERResumen
Extraction of valuable bioactive compounds from olive leaves is a hot topic and the use
of sustainable and green technologies is mandatory in terms of circular economy. In this way, the
use of fermentation technologies showed very interesting results in terms of phenolic compound
recovery. Because of that in this work the use of solid state fermentations, as valuable tool to improve
the phenolic extraction has been checked. Aspergillus oryzae (in mycelium and spore form),
Aspergillus awamori and Aspergillus niger were used as fermentation microrganisms. Phenolic compounds
were determined by HPLC-ESI-TOF-MS and, to our knowledge, new compounds have
been tentatively identified in olive leaves. Fermentation using mycelium of Aspergillus awamori,
Aspergillus niger and Aspergillus oryzae were effective to increase both hydroxytyrosol and elenolic
acid derivatives whereas the use of spores of Aspergillus oryzae caused a loss of hydroxytyrosoyl
derivatives, contrary the content of elenolic derivatives are comparable with the other fermentation
treatments and higher than control. The proposed fermentation processes using the mycelium of
Aspergillus awamori, Aspergillus niger and Aspergillus oryzae lead to an increase the hydroxytyrosyl and
elenolic acid derivatives and could be used at industrial scale to obtain enriched extracts.