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1 Polish Journal of Environmental Studies

1 2012

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Antioxidative and chelating properties of anthocyanins in Azolla imbricata induced by cadmium

100%

Dai L.-P. , Dong X.-J. , Ma H.-H.

nr 4

To investigate the biological activities of anthocyanins, which are induced by cadmium in A. imbricata, the antioxidant properties of anthocyanins were investigated using various antioxidant assays, namely 1,1 -diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, 2,2'-azinobis-(3-ethylbenzthiazoline-6- sulfonic acid) (ABTS) radical scavenging activity, reducing power, and β-carotene bleaching assay. Results showed that anthocyanins exhibited excellent antioxidant activities in all assays and the EC₅₀ values of DPPH radicals scavenging, ABTS radicals scavenging, reducing power and β-carotene bleaching assay were 19.08, 10.69, 40.93, and 44.19 µg∙mL⁻¹, respectively. The Cd²⁺ chelation potency of anthocyanins was also investigated in vitro. Under given conditions, Cd²⁺ chelating ability of anthocyanins increased significantly with increase in contact time, anthocyanins concentration in dialysis tubing and Cd²⁺ concentration in solution. Based on these results, anthocyanins inducibly synthesized by Cd2 treatment was a powerful antioxidant, as well as Cd²⁺ chelator, might play a role in detoxification of Cd in A. imbricata.