They noted that the IC50 values of the hydrolysates ranges
from 0.17 to 0.88 mg/mL, a range that covers most of the
values observed in the current study. In contrast, Guo et al.
(2009) used only one enzyme to obtain WPC hydrolysates
(a protease from L. helveticus LB13), and they tested the
influence of several hydrolytic parameters. They obtained
hydrolysates with ACE-IA between 15 and 63%, a range of
values that are less than most of the results reported here.
In another study, Silva (2010) carried out the hydrolysis
of WPC with a pancreatin similar to that used in the present
study. It was found that the ACE-IA changed from 79.28 to
91.88% for E : S ratios of 0.5:100 to 3.0:100, respectively.
Despite the higher catalytic activity of the pancreatin used
by Silva (2010) (34.7 U/mL), when compared to the pancreatin
used in the present study (5.97 U/mL), the results were
close to four of the six hydrolysates prepared here with the
same enzyme (H21 to H24) and were superior only to two
hydrolysates (H19 and H20).