The effects of garcinol and guttiferone K, two polyisoprenylated benzophenones occurring a food plant called <i>Garcinia cambogia</i>, on oxidative/nitrative protein damage (determined by parameters such as levels of protein carbonyl groups and nitrotyrosine residues) in human blood platelets and plasma after treatment with peroxynitrite (ONOO<sup>-</sup>) were studied <i>in vitro</i>. We also investigated the effects of garcinol and guttiferone K on lipid peroxidation in blood platelets and plasma induced by ONOO<sup>-</sup> (100 µM). Exposure of blood platelets or plasma to peroxynitrite (100 µM) resulted in an increased level of carbonyl groups and nitrotyrosine residues in proteins, and an increase of lipid peroxidation measured by the level of thiobarbituric acid reactive species (TBARS). In the presence of garcinol and guttiferone K (0.125 µg/ml), a distinct reduction in the formation of carbonyl groups in plasma and platelet proteins together with the decrease of TBARS caused by 100 µM peroxynitrite, was observed. However, garcinol and guttiferone K did not inhibit plasma and platelet protein nitration induced by peroxynitrite. Polyisoprenylated benzophenones present in human diet such as garcinol or guttiferone K <i>in vitro</i> have protective effects against lipid and protein oxidation and may have some promising effects <i>in vivo</i> because they are good antioxidants in the tested models <i>in vitro</i>. Garcinol and guttiferone K can be also useful as protecting factors against diseases associated with oxidative stress.
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