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1Antioxidant Effect of Herbs and Spices on Copper Mediated Oxidation of Lower and Very Low Density Lipoprotein显示文摘AIM:The present study investigates the antioxidant effect of two extracts(hydrolyzed and non-hydrolyzed)of five herbs and eight spices in the prevention of LDL+VLDL oxidation promoted by cupric ion.METHODS:The polyphenolic concentrations of these extracts were measured using Folin-Ciocalteu reagent.The antioxidant quality was analyzed by the determination of lag-time,concentration of polyphenol that will inhibit 50%of oxidation of LDL+VLDL(IC50)and phenol antioxidant index(PAOXI). RESULTS:The hydrolyzed extracts had significant higher polyphenol concentration,longer lag-time,lower IC50 and higher PAOXI than the non-hydrolyzed extracts(P<0.001).Thus,hydrolyzed extract contains better quantity and quality polyphenolic antioxidant than the non-hydrolyzed extract.Both hydrolyzed and non-hydrolyzed extracts were better antioxidants than Vitamin E in the inhibition of LDL+VLDL oxidation.CONCLUSION:The reaction rate and concentration of conjugated diene formed suggested that all the extracts had similar reaction mechanism in the prevention of copper mediated LDL+VLDL oxidation.Gabriel A.Agbor Joe A.Vinson Julius E.Oben Jeanne Y.Ngogang 2010中国天然药物2010,8,2:1
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