Abstract
Background: The animal blood that is produced in a slaughterhouse is a potential source
of inexpensive proteins used in the food industry around the world. However, 60% of it is surplus,
and it ends with a negative environmental impact.
Introduction: The enzymatic hydrolysis of proteins represents a good way to produce peptides with
different biological activities.
Methods: Enzymatic hydrolysis of bovine plasma with subtilisin at an alkaline pH and 61.5°C was
performed using the pH-stat method. Experiments were conducted considering the effects of a high
initial substrate concentration (So) and the enzyme/substrate ratio (E/S) minimizing the processing
time necessary to obtain a specific degree of hydrolysis (DH).
Results: The best conditions obtained were 42 g/L of So and 0.89 AU/g substrate of E/S until a DH
of 20% in 11,1 ± 1,1 min was achieved to the tested conditions, which result in a fitted empirical
polynomial equation of degree 3.
Conclusion: A kinetic equation is established to relate the DH and the reaction time to a relative error
of less than 5% in the fit, to obtain a good antioxidant product in an industrially interesting time.
Additionally, the results suggest a good adjustment of the data with a determination coefficient (R2)
of 0.9745 in validation.
Keywords:
Antioxidants, degree of hydrolysis, enzymatic hydrolysis, kinetic model, pH-Stat method, protein hydrolysates.
Graphical Abstract
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