Antioxidant properties of aqueous extracts from red tide plankton cultures

Yoshimi Niwano, Emiko Sato, Masahiro Kohno, Yukihiko Matsuyama, Daekyung Kim, Tatsuya Oda

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


The antioxidant properties of aqueous extracts from the dinophycean flagellates Gymnodinium impudicum and Alexandrium affine and the raphidophycean flagellate Chattonella ovata were examined. An electron spin resonance (ESR)-spin trapping method coupled with steady state kinetic analysis showed that all of the extracts directly scavenge superoxide, and that the superoxide scavenging potential of any of the extracts was comparable to that of L-ascorbic acid. As for hydroxyl radical scavenging, the Fenton reaction and the method of ultraviolet radiation to hydrogen peroxide were used as hydroxyl radical generation systems. All of extracts reduced the level of hydroxyl radicals in both of the systems, indicating that the extracts also directly scavenge hydroxyl radicals. Since the levels of phenolic compounds did not correlate with the antioxidant activities of the extracts, substances other than phenolic compounds also appeared to be attributable to the activities. It is of our interest that the scavenging activities of extract from G. impudicum against superoxide and hydroxyl radicals were increased by heat exposure at 100 °C and 200 °C respectively. Although the reason for the increased activities of the aqueous extract from G. impudicum is not clear, the heatresistance of the extract from G. impudicum might make it a desirable antioxidant.

Original languageEnglish
Pages (from-to)1145-1153
Number of pages9
JournalBioscience, Biotechnology and Biochemistry
Issue number5
Publication statusPublished - 2007


  • Hydroxyl radical scavenging
  • Red tide plankton
  • Superoxide scavenging


Dive into the research topics of 'Antioxidant properties of aqueous extracts from red tide plankton cultures'. Together they form a unique fingerprint.

Cite this