Abstract
BACKGROUND:
The present work stands as an endeavor to uncover the ideal harvesting time of leaves in which they exhibits the maximum contents of bioactive molecules such as essential fatty acids, tocopherols and carotenoids.
METHODS:
A large scale investigation was carried out for the leaves of
OBJECTIVE:
During the growth period, the effects of harvesting date on the total contents of lipids, tocopherols, carotenoids, fatty acids composition and also the antioxidant activities of the lipids were investigated.
RESULTS:
The content of myristic acid and other saturated fatty acids increased during leaf development, while linoleic, linolenic acids and unsaturated fatty acids decreased. The highest percentages of both linolenic C18:3 (27.25±5.92%) and linoleic acids C18:2 (17.68±3.80%) were obtained for the month of May at the first stage of leaves development (young leaves), but higher percentage levels of C18:1, were obtained for both consecutive months of August & September (28.83±6.50%; 27.79±8.63%, respectively) at intermediate developing stage. The lipids, tocopherols, carotenoids contents and the saturated and unsaturated fatty acids were dependent on the harvest time. The antioxidant activity showed higher powers at the first developing stage (May). Two main clusters and two sub-clusters of the fatty acids were distinguished and were also depending clearly on the period of the collection.
CONCLUSIONS:
The results showed that the FA were dependent on the period of collection of the leaves. The main result of this study illustrate the nutritional potential (richness in MUFA such as C18:1, 2, 3) of the oil of
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