Antioxidant activities and polyphenolic contents of three selected Micromeria species growing in Croatia (CROSBI ID 565531)
Prilog sa skupa u časopisu | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Vladimir-Knežević, Sanda ; Blažeković, Biljana ; Bival Štefan, Maja ; Alegro, Antun
engleski
Antioxidant activities and polyphenolic contents of three selected Micromeria species growing in Croatia
The genus Micromeria (Lamiaceae) is represented by nine species in Croatia, three of which (M. croatica (Pers.) Schott, M. dalmatica Benth. and M. pseudocroatica Šilic) are endemic [1]. Micromeria species are perennial herbs or dwarf shrubs growing mostly in Mediterranean region. Some of them are traditionally used against heart disorders, headache, colds, wounds and skin infections, as well as condiments [2]. In the present paper, antioxidant activities of M. croatica, M. juliana and M. thymifolia were evaluated using five in vitro antioxidant assays, in comparison with plant polyphenolic constituents and reference antioxidants. All studied plant extracts exhibited considerable activity to scavenge DPPH and hydroxyl free radicals, reducing power, iron-chelating ability and total antioxidant capacity in order: M. croatica > M. juliana > M. thymifolia. Among the tested plants, ethanolic extract of M. croatica was found to be the most effective DPPH radical scavenger (IC50 4.7 μg/ml), even stronger than BHT (IC50 6.5 μg/ml). The highest activity toward hydroxyl free radicals was recorded for the same extract (IC50 249.65 μg/ml). Additionally, it also showed the strongest reducing power (IC50 9.64 μg/ml) and iron-chelating ability (IC50 227.47 μg/ml). In phosphomolybdenum assay, M. croatica displayed twofold lower total antioxidant capacity than ascorbic acid. Total polyphenol (9.69-13.66%), phenolic acid (5.26-6.84%), flavonoid (0.01-0.09%) and tannin contents (3.07-6.48%) in dried plant samples were spectrophotometrically determined. A good correlation between antioxidant activities and contents of phenolic acids and tannins was established, indicating their responsibility for antioxidant capabilities of Micromeria species. References: 1. Lovašen-Eberhardt, Ž. (2000) Nat. Croat. 9:19-20. 2. Duru, M.E. (2004) J. Ethnopharmacol. 94:43-48.
Micromeria croatica; Micromeria juliana; Micromeria thymifolia; antioxidant activity; polyphenols
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Podaci o prilogu
1256-1256.
2010.
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objavljeno
Podaci o matičnoj publikaciji
Planta medica
Melzig, Matthias F. ; Kolodziej, Herbert
Stuttgart: Georg Thieme Verlag
0032-0943
Podaci o skupu
58th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research
poster
29.08.2010-02.09.2010
Berlin, Njemačka