Summary: | In this study, a detailed phytochemical investigation of compounds in the twigs of the mistletoe <i>Loranthus europaeus</i> Jacq., which belongs to the Loranthaceae family, is presented. Specimens were collected from the mistletoe <i>L. europaeus</i> growing on oak trees in the mainland of Greece. The alliance of oaks and mistletoes became a symbol of knowledge and strength for many centuries. Although numerous compounds of aerial tissues of other mistletoes, e.g., <i>Viscum album,</i> have been published, few studies have been conducted to investigate the metabolic and physiological traits of the hemiparasitic, deciduous <i>Loranthus europaeus</i>. LC-HRMS-based analysis led to a detailed characterization of ethyl acetate and dichloromethane extracts of the twigs of <i>L. europaeus</i>, which, to the best of our knowledge, exhibit enhanced antioxidant potential. Hence, twenty-four and twenty-six compounds were tentatively identified from the ethyl acetate and dichloromethane twigs’ extracts, respectively; these compounds belong to fatty acids, flavonoids, and flavonoid glycosides. Also, chlorophyll, soluble sugar, starch, and lipid contents in the twigs of <i>L. europaeus</i>, which have not hitherto been published, were investigated.
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