Since in vitro studies have shown that phenolic compounds may prevent lipid peroxidation and formation of atherosclerotic plaques [31, 32], in this study the antioxidant activity of EPS50MAE was also evaluated by measuring antilipoperoxidative capacity in human plasma incubated with or without extract for 2 h at 37°C. Results of this study showed that the addition of EPS50MAE determined an inhibition of lipid peroxidation (Table 3) even though this effect was moderate with respect to superoxide anion scavenging activity. The ability of EPS50MAE to counteract in vitro plasmatic lipid peroxidation may contribute to prevention of the formation of atherosclerotic plaques and subsequent cardiovascular diseases.