| Screening for Antioxidant Activity in Some Red Tide Dinoflagellates
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| Chang-Sook Kim, Yong-Chul Cho
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| ABSTRACT |
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Antioxidant activity of ethanol extracts obtained from 11 red tide dinoflagellates was evaluated by determination of radical scavenging effects and inhibition of lipid peroxidation. Lipoxygenase activity was depressed in the presence of algal extracts as following sequence; Alexandrium tamarense>= Cochlodinium polykrikoides> Prorocentrium minimum>= Gyrodinium impudicum> Prorocentium micans>=Gymnodinium sanguineum>= Pyraminonas sp.>= Heterocapsa triquetra>= Heterosigma akashiwo>= Eutreptiella gymnatica. >= Scrippsiella trochoidea The inhibition of lipoxygenase by C. polykrikoides and A. tamarense extracts resembles that of seaweed, Porphyra sp. The extracts of A. tamarense and C. polykrikoides also had the highest antioxidant activity, when measured by the decolorization of α,α-diphenyl-β-picrylhydrazyl (DPPH) and N, N-dimethyl-4-nirosoaniline(RNO)-imidazole method, respectively. The same species also displayed a very strong antioxidant activity on lipid peroxidation of a multilayer liposome system. These results suggested the possibility of the existence of the existence of effective antioxidative compounds in A. tamarense and C. polykrikoides.
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| Key words:
antioxidant, free radical, lipid peroxidation, red tide dinoflagellate, singlet oxygen introduction |
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