Seasonal variations in antioxidant compounds of <i>Olea europaea</i> leaves collected from different Italian cultivars
DOI:
https://doi.org/10.5073/JABFQ.2016.089.025Keywords:
Olea europaea leaves, antioxidant activity, oleuropein, hydroxytyrosol, HPLC-DADAbstract
The objectives of this research were to study the best conditions for phenol extraction from olive tree leaves and to evaluate the content of phenolics and the antioxidant activity by in vitro assays in olive leaves harvested in different periods from four different Italian cultivars. The results showed that leaves/solvent ratio and temperature showed a significant and positive correlation with phenol extraction yield. In all harvesting periods the phenol content of Dolce Agogia samples was higher (P ≤ 0.05) with respect to Moraiolo, Leccino and Frantoio samples. The results of analysis by high-performance liquid chromatography coupled with diode array detector (HPLC-DAD) showed that Dolce Agogia had the highest concentrations of hydroxytyrosol and oleuropein. Moreover the highest contents of bioactives have been found in olive leaves harvested in December and March. In these months, corresponding to olive harvest and pruning of olive trees, leaves represent a waste product and this interesting result could be useful in the production of nutraceuticals.Downloads
Published
Issue
Section
License
From Volume 92 (2019) on, the content of the journal is licensed under the Creative Commons Attribution 4.0 License. Any user is free to share and adapt (remix, transform, build upon) the content as long as the original publication is attributed (authors, title, year, journal, issue, pages) and any changes are labelled.
The copyright of the published work remains with the authors. If you want to use published content beyond what the CC-BY license permits, please contact the corresponding author, whose contact information can be found on the last page of the respective article. In case you want to reproduce content from older issues (before CC BY applied), please contact the corresponding author to ask for permission.