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Retention of IgG (A), LTF (B), IgA (C), IgM (D) concentrations, and LPO (E) and XO activity (F) after different treatments. S: Skim milk; HTST: HTST pasteurization; MF: microfiltration, MUS1, MUS2 and MUS3: microfiltration combined with ultrasonication with different energy densities at 432, 1296 and 2160 J/mL, respectively. Different letters indicate significant difference (p < 0.05).
