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1.        A 50 mM Potassium Phosphate Buffer, pH 7.5. Prepare using 11.4 mg/ml of potassium phospate dibasic, trihydrate in purified water and adjusting pH with 1M HCl. This solution is placed at 37¡ãC prior to use.
2.        A 0.65% weight/volume casein solution, prepared by mixing 6.5 mg/ml of the 50 mM potassium phosphate buffer. The solution temperature is gradually increased with gentle stirring to 80-85 ¡ãC for about 10 minutes until a homogenous dispersion is achieved. It is very important not to boil the solution. The pH is then adjusted if necessary with NaOH and HCl.
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