As shown in Fig. 4, the metal chelating activity of the essential
oil increased with increasing concentrations used in the test.
Compared with EDTA, which is known to be a strong metal
chelating agent, the chelating ability of the samples on ferrous ion was weaker. The IC50 of the essential oil and EDTA in this reaction
system were 0.51 and 0.21 mg/mL, respectively.
It has been recognized that the metal chelating ability might be
involved in antioxidant activity and affected other functions that
contribute to the antioxidant activity (Moure, Dominguez, & Parajo,
2006). Therefore, at least partly, the chelating effect of essential oil
from A. cepa on ferrous ions might affect the other activities of
scavenging free radicals to protect organism against oxidative
damage.
As shown in Fig. 4, the metal chelating activity of the essentialoil increased with increasing concentrations used in the test.Compared with EDTA, which is known to be a strong metalchelating agent, the chelating ability of the samples on ferrous ion was weaker. The IC50 of the essential oil and EDTA in this reactionsystem were 0.51 and 0.21 mg/mL, respectively.It has been recognized that the metal chelating ability might beinvolved in antioxidant activity and affected other functions thatcontribute to the antioxidant activity (Moure, Dominguez, & Parajo,2006). Therefore, at least partly, the chelating effect of essential oilfrom A. cepa on ferrous ions might affect the other activities ofscavenging free radicals to protect organism against oxidativedamage.
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