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      Antioxidant properties of flavonol glycosides from green beans.

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          Abstract

          We have examined the antioxidant activity of one class of polyphenolic compounds in green beans: two novel flavonol glycosides (quercetin 3-O-[xylosyl(1-->2)]-rhamnosyl (1-->6)-glucoside and the corresponding kaempferol analogue), quercetin 3-O-glucuronide, kaempferol 3-O-glucuronide, quercetin 3-O-rutinoside and kaempferol 3-O-rutinoside. The Trolox 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 glucuronide and rutinoside of quercetin were good antioxidants, but not as effective as the quercetin aglycone. TEAC values for the glucuronide and other glycosides of kaempferol were much lower than the corresponding quercetin species but similar to that of the kaempferol aglycone. Quercetin 3-O-glucuronide and quercetin 3-O-rutinoside were both potent inhibitors of lipid peroxidation, in contrast to the those of kaempferol. The compounds described herein demonstrate the antioxidant activity of the flavonols present in green beans and indicate the effect on antioxidant activity of sugar substitutions in the phenolic C ring.

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          Author and article information

          Journal
          Redox Rep.
          Redox report : communications in free radical research
          1351-0002
          1351-0002
          1999
          : 4
          : 3
          Affiliations
          [1 ] Diet, Health and Consumer Sciences Division, Institute of Food Research, Norwich, UK. geoff.plumb@bbsrc.ac.uk
          Article
          10.1179/135100099101534800
          10496415
          5e15aaf9-b57d-46e8-98c8-d89c90b9d4b5
          History

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