Abstract
Casein was digested with a cheaper enzyme, alcalase, to produce casein phosphorylated peptides and casein non-phosphorylated peptides concurrently. The casein hydrolyzates were separated to the two kinds of peptides by using combined treatment of CaCl2 and ethanol. Casein phosphorylated peptides and non-phosphorylated peptides constitute some peptides with molecular weight lower than 2509 Da and 2254 Da respectively as determined using size exclusion HPLC, particularly when a degree of hydrolysis of 20% for the casein hydrolyzates was achieved. At the end, the recovery of casein phosphorylated peptides reached 24%. Phosphorus component of casein phosphorylated peptides was found to be 3.08%. The nitrogen recovery of casein non-phosphorylated peptides was about 76%.
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