Extensive screening for edible herbal extracts with potent scavenging activity against superoxide anions

Keita Saito, Masahiro Kohno, Fumihiko Yoshizaki, Yoshimi Niwano

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


To search for edible herbal extracts with potent antioxidant activity, we conducted a large scale screening based on the superoxide scavenging activity. That is, scavenging activity against superoxide anions were extensively screened from ethanol extracts of approximately 1,000 kinds of herbs by applying an electron spin resonance (ESR)-spin trapping method. Among them we chose four edible herbal extracts with prominently potent ability to reduce the signal intensity of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO)-OOH, a spin adduct formed by DMPO and superoxide anion. They are the extracts from Punica granatum (Peel), Syzygium aromaticum (Bud), Mangifera indica (Kernel), and Phyllanthus emblica (Fruit), and are allowed to be used as foodstuffs according to the Japanese legal regulation. The ESR-spin trapping method coupled with steady state kinetic analysis showed that all of the four extracts directly scavenge superoxide anions, and that the superoxide scavenging potential of any of the extracts was comparable to that of L-ascorbic acid. Furthermore, polyphenol determination indicates that the activity is at least in part attributable to polyphenols. These results with such large scale screening might give useful information when choosing a potent antioxidant as a foodstuff.

Original languageEnglish
Pages (from-to)65-70
Number of pages6
JournalPlant Foods for Human Nutrition
Issue number2
Publication statusPublished - 2008 Jun


  • Edible herbal extracts
  • Superoxide scavenging activity

ASJC Scopus subject areas

  • Food Science
  • Chemistry (miscellaneous)


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