nmol/mg LDL protein and 0.073 nmol rutin equivalents/mg LDL protein, respectively. The analytical within-run imprecision (n � 10), expressed as the CV, ranged from 4.2 % for peak 1 to 6.3 % for rutin. The analytical between-run imprecision (n � 10), expressed as the CV, ranged from 4.6 % for peak 1 to 13 % for rutin. The recovery obtained (n � 6) was 80.6 % � 6.7 % (mean � SD). Rutin, quercetin, and flavonoids are phenolics present in fruits, vegetables, spices, olive oil, and red wine (5–9). Quercetin-rich foods such as onions or red wine have been shown to delay the susceptibility of LDL to oxidation after their supplementation in in vivo human studies (5, 6). Rutin and quercetin have been shown to delay the susceptibility of VLDL plus LDL to oxidation in in vitro studies after their addition to the isolated lipoprotein
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