Determination of Nutrient Elements Content, Essential Oils Ratio and Biochemicals Composition of Origanum rotundifolium Boiss. and Origanum syriacum L.

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In the study, the biochemical composition of bioactive ingredients, essential oils ratio and compounds, mineral elements content, and antioxidant activities of two Origanum species (O.rotundifolium Boiss. and O. syriacum L.) were investigated. It has been observed that the total flavonoid and phenolic contents vary, with the amounts being 6.57 mg QE g-1 and 225.79 mg GAE g-1 for O. rotundifolium Boiss., and 184.65 mg QE g-1 and 114.46 mg GAE g-1 for O. syriacum L., respectively. The highest element contents have been determined for macroelement Calcium (Ca)> Potassium (K)> Magnesium (Mg); and for microelement Iron (Fe)> Manganese (Mn) > Zinc (Zn)> Copper (Cu)>, respectively. The essential oil yield was determined between 2.39% (O. rotundifolium Boiss) and 5.29% (O. syriacum L.). Essential oil compositions were determined by GC-MS (Gas Chromatography–Mass Spectrometry analysis). Besides, the major components found in two species were carvacrol, γ-terpinene and cymene. As a result of the study, O. rotundifolium Boiss. and O. syriacum L. species are rich in nutrients and biochemical content and can be used in many areas as an alternative food source.