“…Early studies of adding high concentrations of H 2 O 2 (100 mg L À1 to 15 g L À1 ) to milk prior to cheese making showed that the treatment led to softness of cheese mass (Kosikowski & Fox, 1968;Roundy, 1958), higher solubility of casein, and higher susceptibility of casein to proteolysis by rennet (Fox & Kosikowski, 1967) and Pseudomonas fluorescens proteolytic enzymes (Fish, Pinkston, Claydon, & Mickelsen, 1969). Schmidt, Morris, and Morr (1969) reported reduced rate and completeness of casein clotting by rennet in presence of high concentrations of H 2 O 2 .…”