Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 2
Written by Tatyana BILEVA, Nadezhda PETKOVA, Ekaterina VALCHEVA, Ivan IVANOV, Plamen ZOROVSKI, Selçuk ASLAN
The current investigation aimed to evaluate total carotenoids, chlorophylls, phenols, flavonoids, as well as the individual phenolic compounds and antioxidant potential in ironwort (Sideritis syriaca L.) collected from Strandzha mountain in Bulgaria and Turkey. Five phenolic acids (chlorogenic, caffeic, p-coumaric, ferulic and sinapic acids) and ten flavonoids (lavandulifolioside, verbascoside, forsythoside A, isoscutellarein 7-O-allosyl(1→2)glucoside, apigenin 7-O-allosyl(1→2)glucoside, isoscutellarein 7-O-allosyl-(1→2)-[6′′-O-acetyl]-glucoside, hypolaetin 7-O-allosyl-(1→2)-[6′′-O-acetyl]-glucoside 3'-O-Methylhypolaetin 7-O-[6′′′-O-acetyl]-allosyl(1→2) glucoside, 4'-O-methylhypolaetin 7-O-[6′′′-O-acetyl]-allosyl(1→2)glucoside, apigenin 7-(6"-p-coumaroylglucoside) and apigenin 7-4"-p-coumaroylglucoside) were detected. The samples collected from the Bulgarian part of Strandzha mountain showed 1.5 to 2.5 times higher values for individual phenolic compounds and twice higher antioxidant activity and total carotenoids content in comparison to Turkish samples. Ferulic acid (8173 µg/g dw) and isoscutellarein 7-O-allosyl-(1→2)-[6′′-O-acetyl]-glucoside (4452 µg/g dw) were detected in the highest content in Bulgarian ironwort.
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