Antioxidant properties of the major polyphenolic compounds in broccoli

Geoffrey W. Plumb, Keith R. Price, Michael J.C. Rhodes, Gary Williamson

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We have examined the antioxidant activity of the major phenolic compounds in Broccoli: two flavonol glycosides (quercetin 3-O-sophoroside and kaempferol 3-O-sophoroside) and four hydroxycinnamic acid esters (1,2'-disinapoyl-2-feruloyl gentiobiose, 1-sinapoyl-2-feruloyl gentiobiose, 1,2,2'-trisinapoyl gentiobiose and 1,2-disinapoyl gentiobiose). The Trolox C equivalent antioxidant capacity (TEAC) and inhibition of iron/ascorbate-induced lipid peroxidation of phosphatidyl choline vesicles were measured. In the aqueous phase TEAC assay, the two flavonol glycosides were less active than their respective aglycones. TEAC values for the hydroxycinnamic acid esters were less than the sum of their constituent hydroxycinnamic acids on a molar basis. Quercetin 3-O-sophoroside was a potent inhibitor of lipid peroxidation, in contrast to kaempferol 3-O-sophoroside. The hydroxycinnamic acid esters were highly effective at preventing lipid damage with the exception of 1,2,2'-trisinapoyl gentiobiose. The six compounds analysed herein demonstrate the antioxidant activity of the major phenolics in broccoli and indicate the effect on antioxidant activity of sugar substitutions in the phenolic B ring.

Original languageEnglish
Pages (from-to)429-435
Number of pages7
JournalFree Radical Research
Issue number4
Publication statusPublished - 1 Jan 1997
Externally publishedYes


  • Antioxidant
  • Broccoli
  • Ferulic acid
  • Flavonol glycosides
  • Hydroxycinnamic acid esters
  • Lipid peroxidation
  • Quercetin
  • Sinapic acid
  • TEAC

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