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Apparent viscosity at a shear rate of 300 s−1 and 25 °C for concentrated skim milk solutions at 30% w/w, total solids, and pH 6.1, 6.3, 6.5, or 6.7 after 90 min of recirculation in the fouling rig at 85 °C. The unheated control was not subjected to heat treatment on the fouling rig. Results are the means of data from two independent trials. Mean values not sharing a common letter differ significantly (p < 0.05).
