In vitro assessment of the protective effect of casein (free or bound to iron) against iron-induced peroxidation of liposomes (adapted from reference [15]). TBARS – 2-thiobarbituric acid reactive substances: (1) 3.3·10⁻⁴ mol·L⁻¹ of iron either free or in its complexed form and 8.4·10⁻⁵ mol·L⁻¹ of caseins, (2) 1.6·10⁻⁴ mol·L⁻¹ of iron and 4.2·10⁻⁵ mol·L⁻¹ of caseins; (1) vs. (2): P < 0.05 for caseins/iron, FeCl₂, and FeCl₃. ANOVA: P < 0.05; t tests: caseins < caseins/iron < FeCl₂ and FeCl₃.