Determination of Peroxyl Radical-Scavenging Activity in Food by Using Bactericidal Action of Alkyl Peroxyl Radical

Takaaki Akaike, Sumiko Ijiri, Keizo Sato, Takato Katsuki, Hiroshi Maeda

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

A novel bioassay for antioxidant activity based on bactericidal actions of alkyl peroxyl radicals (ROO) was developed. ROO was generated by the reaction of heme irons and various alkyl hydroperoxides. A Gram-positive bacterium, Staphylococcus aureus, was subjected to cytotoxic treatment with ROO with or without various antioxidants. This bacterial suspension was serially diluted, on a 96-well multiplate, in mannitol broth containing phenol red as a pH indicator. After overnight incubation, the growth of ROO-treated bacteria produces acid, resulting in a change in color of the broth, which permits easy quantitation of viable bacteria protected by antioxidants. Accordingly, ROO scavenging by various antioxidants could be reproducibly quantitated. Among 22 antioxidants tested, cytotoxicity was substantially inhibited by α-tocopherol, glutathione, l-cysteine, probucol, butylated hydroxyanisole, and butylated hydroxytoluene. Furthermore, the antibactericidal activity of various teas and nonalcoholic drinks showed very high correlation with their antioxidant activities determined by luminol-dependent chemiluminescence assay (r = 0.91). By this simple bioassay, a large number of samples can be analyzed simultaneously to determine ROO-scavenging activity.

Original languageEnglish
Pages (from-to)1864-1870
Number of pages7
JournalJournal of Agricultural and Food Chemistry
Volume43
Issue number7
DOIs
Publication statusPublished - 1995 Jul 1
Externally publishedYes

Keywords

  • Alkyl peroxyl radical
  • antioxidant
  • bactericidal action
  • bioassay
  • peroxyl radical scavenger

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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