CN at 0.06% (W/W) was digested at 37C at a pH 2.0 acid with pepsin at a ratio of 1:50 (w/w) (enzyme:substrate), with the addition of the enzyme at the beginning of hydrolysis and after 3 h. Hydrolysis was then inactivated by increasing pH up to 7.0. The supernatant after clarification was collected and spray dried.