Antioxidant Ability of Various Flavonoids against DPPH Radicals and LDL Oxidation

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Author(s)

Abstract

Flavonoids, a group of polyphenolic compounds, exist naturally and serve as antioxidants in vegetables, fruits, and so on. The inhibition of low density lipoprotein (LDL) oxidation may be an effective way to prevent or delay the progression of atherosclerosis. In the present study, we analyzed the radical scavenging capacity of 10 flavonoids (catechin, epicatechin [EC], epigallocatechin [EGC], epicatechin gallate [ECg], epigallocatechin gallate [EGCg], myricetin, quercetiji, apigenin, kaempferol, and luteolin) toward 1, 1-Biphenyl-2-picryl-hydrazyl [DPPH]. After 20 min of incubation, EGCg was the most effective DPPH radi-cal scavenger, luteolin being the least active of this flavonoid group. The mutual antioxidant effect of flavonoids with a-tocopherol (a-toc) on LDL oxidizability was investigated by using the lipophilic azo radical initiator 2, 2'-azobis(4-methoxy-2, 4-dimethylvaleronitrile) [AMVN-CH<sub>3</sub>O]. An inhibitory effect of flavonoids on LDL oxidation was observed in the order of luteolin>ECg>EC>quercetin>catechin>EGCg>EGC>myricetin>kaempferol>apigenin. The shortened lag time induced by higher doses of a-toc (6 mg/100 mL) was re-stored by flavonoids. These results suggest that 1) radical trapping effects of flavonoids differ according to their structure, and 2) flavonoids act as hydrogen donors to a-toc radical; fur-thermore, by interaction with a-toc, they have a greater potential to delay the oxidation of LDL.

Journal

  • Journal of Nutritional Science and Vitaminology

    Journal of Nutritional Science and Vitaminology 47(5), 357-362, 2001-10-01

    Center for Academic Publications Japan

References:  30

Cited by:  10

Codes

  • NII Article ID (NAID)
    10008015765
  • NII NACSIS-CAT ID (NCID)
    AA00703822
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    03014800
  • NDL Article ID
    5988781
  • NDL Source Classification
    ZR2(科学技術--生物学--生化学)
  • NDL Call No.
    Z53-B484
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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