“Determination of the extent of LDL oxidation by measuring the formation of thiobabituric acid reactive substances (TBARS) … CuSO4 (10 microM) or 2,2'-azobis (2-amidino-propane) dihydrochloride (AAPH) (5 mM), revealed that glabridin or quercetin …% reduction in copper ion induced oxidation, respectively, and a … induced LDL oxidation, respectively.”