PHYSICAL PROPERTIES OF MILK 040 ethylene npopheno 十02 Ascor bat● Riboflay 0.20 H, Electrode 0.30 0.40 H Figure 11.1 Effect of pH on the oxidation-reduction potential of various systems(from aldehyde group of lactose can be oxidized to a carboxylic acid(lactobionic acid)at alkaline pH but this system contributes little to the redox properties of milk at pH 6.6 The En of milk is influenced by exposure to light and by a number processing operations, including those which cause changes in the concen tration of O2 in the milk. Addition of metal ions(particularly Cu2+)also infuences the redox potential Heating of milk causes a decrease in its ePHYSICAL PROPERTIES OF MILK 44 1 PH Figure 11.1 Effect of pH on the oxidation-reduction potential of various systems (from Sherbon, 1988). aldehyde group of lactose can be oxidized to a carboxylic acid (lactobionic acid) at alkaline pH but this system contributes little to the redox properties of milk at pH 6.6. The E, of milk is influenced by exposure to light and by a number of processing operations, including those which cause changes in the concen￾tration of 0, in the milk. Addition of metal ions (particularly CuZf) also influences the redox potential. Heating of milk causes a decrease in its E