, 36:1111

Antioxidative activity of 3,4-dihydroxyphenylacetic acid and caffeic acid in rat plasma

  • Violeta Raneva
  • Hiroyuki Shimasaki
  • Yumi Ishida
  • Nobuo Ueta
  • Etsuo Niki


The purpose of the present paper is to study and compare in vitro the inhibitory effect of 3,4-dihydroxyphenylacetic acid (DOPAC) and caffeic acid (CA) on lipid peroxidation in rat plasma. Rat plasma was oxidized at 37°C by the radical initiators 2,2′-azobis(2-amidinopropane) dihydrochloride (AAPH) or 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile) (MeO-AMVN). The consumption of endogenous α-tocopherol (α-TOH) and the accumulation of conjugated diene hydroperoxides were measured by high-performance liquid chromatography and by ultraviolet spectroscopy, respectively. α-TOH was consumed at the same rate in the presence of 20 mM AAPH or 2 mM MeO-AMVN. DOPAC and CA suppressed the α-TOH consumption in a dose-dependent manner. A concentration of 50 μM of both phenolic acids was sufficient to induce a lag phase and to delay the rate of α-TOH consumption. The effect was more pronounced in rat plasma oxidation by AAPH than by MeO-AMVN. CA spared vitamin E more effectively than DOPAC in both oxidations. DOPAC and CA suppressed the formation of conjugated diene hydroperoxides. DOPAC and CA at concentration 50 μM suppressed α-TOH consumption during oxidation of soybean phosphatidylcholine (2.8 mM) multilamellar vesicles containing 15 μM α-TOH, in which the lipophilic initiator 2,2′-azobis (2,4-dimethylvaleronitrile) (6 mM) was incorporated. In conclusion, we demonstrated that DOPAC and CA in micromolar concentrations have antioxidant activity in rat plasma, a medium very close to the conditions in vivo, suggesting that supplementation with the phenolic acids will provide significant antioxidant protection.



ascorbic acid


2,2′-azobis(2-amidinopropane) dihydrochloride




caffeic acid


3,4-dihydroxyphenylacetic acid


high-performance liquid chromatography


low density lipoproteins




multilamellar vesicles


phosphate-buffered saline








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Copyright information

© AOCS Press 2001

Authors and Affiliations

  • Violeta Raneva
    • 2
  • Hiroyuki Shimasaki
    • 2
  • Yumi Ishida
    • 2
  • Nobuo Ueta
    • 2
  • Etsuo Niki
    • 1
  1. 1.Human Stress Signal Research CenterIkedaJapan
  2. 2.First Department of BiochemistryTelkyo University School of MedicineTokyoJapan

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