engleski

Cultivar dependant variations of olive leaf oleuropein concentrations

Olive leaf is one of the traditional herbal remedies, used since the time of ancient Egypt. One of the most important biological components of olive leaves are phenols, the most represented by secoiridoid oleuropein. Is to be assumed that different olive cultivars can differ by their leaf oleuropein content. Thus, the aim of this work was to investigate the difference in oleuropein concentrations in olive leaves of five Croatian autochthonous cultivars: Buža puntoža, Buža, Istarska bjelica, Karbonaca, Rošinjola and Italian Leccino as one of the most common allochthonous olive cultivar in Croatian olive groves. Sampling was conducted at a growth season 2017/2018 in olive grove located in Istria during two terms, harvest and pruning. Each of the six cultivars was represented by 3 trees. Selected cultivars had shown significant differences in oleuropein concentrations in both sampling periods. During harvest, the highest concentration of oleuropein in the leaf was measured in Leccino cv. leaves 4962, 29 (mg/100 g DW), and the lowest in Rošinjola cv. 500, 8 (mg/100 g DW). During pruning, the highest concentration of oleuropein in the leaf was measured in Buža cv. 8064, 04 (mg/100 g DW) and the lowest was Karbonaca cv. 1627, 73 (mg/100 g DW). Due to leaf oleuropein concentration differences in selected Croatian olive cultivars further trials with more cultivars and different locations need to be conducted.

Oleuropein ; Olea europaea L. ; Phenols ; Leccino cv. ; Buža cv.

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