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Sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE) electrophoretograms of fouling material recovered from the heat exchanger of the fouling rig after recirculation of concentrated skim milk solutions at 30% w/w total solids at pH 6.1 and 6.3 at 85 °C for 90 min: lanes 1 and 10, molecular weight marker; lanes 2–3 and 6–7, foulant at pH 6.1; lanes 4–5 and 8–9, foulant at pH 6.3. Lines 1–5: reducing conditions; lines 6–10: non-reducing conditions.
