decreasing the E : S ratio from 1.2:100 to 0.2:100 did not
produce significant changes in the ACE-IA values, which
were 63 and 59%, respectively.
The fact that, in some cases, the use of a lower E : S ratio
allows for the preparation of hydrolysates with greater
ACE-IA could indicate that there is an optimal enzyme concentration,
beyond which there is greater degradation than
formation of ACE-inhibitor peptides, which would reduce
overall IA (Raghavan and Kristinsson 2009).
CONCLUSION
In conclusion, changes of proteolytic enzyme type and E : S
ratio had different influences on the ability of WPC
hydrolysates to inhibit ACE. The B. licheniformis protease
performed better than other enzymes, and it produced
hydrolysates with the greatest rates of ACE inhibition. The
best result was obtained using an E : S ratio of 8.0:100. The
beneficial effect of using lower E : S ratios to obtain greater
values of ACE-IA was observed for the proteases from
B. licheniformis and A. oryzae.
ACKNOWLEDGMENTS
This work was supported by Conselho Nacional de Desenvolvimento
Científico e Tecnológico (CNPQ), Fundação de
Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)
and Coordenação de Aperfeiçoamento de Pessoal de Nível
Superior (CAPES).