Title:Characterization, ACE Inhibitory and Antioxidative Properties of Peptide
Fractions Obtained from White Shrimp (Litopenaeus vannamei)
Volume: 18
Issue: 10
Author(s): Juliana Latorres*, Wilson Wasielesky and Carlos Prentice
Affiliation:
- Laboratory of Food Technology, School of Chemistry and Food, Federal University of Rio Grande, Av. Italia km 8,
P.O. Box 474, Rio Grande, RS, Brazil
Keywords:
White shrimp, peptide, enzymatic hydrolysis, ACE inhibitory, antioxidative activity, alcalase, protamex.
Abstract:
Background: Aquatic organisms are considered to be an important source of bioactive
peptides with a high antioxidant and antihypertensive capacity. Therefore, the objective of this
study was to hydrolyse peptide fractions from white shrimp (Litopenaeus vannamei) muscle by Alcalase
and Protamex and to evaluate the angiotensin I-converting enzyme (ACE) inhibitory and the
antioxidant activities.
Methods: Protein hydrolysates of White shrimp were obtained by enzymatic hydrolysis using Alcalase
and Protamex until the degree of hydrolysis reached 10% and 20%. Peptide fractions were
obtained from White shrimp protein hydrolysates by ultrafiltration using membranes with sizes of
10 and 3 kDa. The antioxidant activity was evaluated for the three peptide fractions (F1: >10 kDa,
F2: 3-10 kDa and F3: <3 kDa). To measure the antihypertensive activity, fractions with molecular
sizes of less than 3 kDa were used.
Results: The fractions obtained with Alcalase showed greater inhibitory effects on the ACE. In general,
the molecular weight of the fractions influenced the antioxidant activity, with fractions smaller
than 3 kDa having a high capacity for sequestering the DPPH radical, while peptide fractions
with a size greater than 10 kDa presented higher reducing power. However, in capturing the ABTS
radical, a high antioxidant capacity was observed for both fractions.
Conclusion: The results suggest white shrimp would be an attractive raw material for the manufacture
of antioxidant and anti-hypertensive nutraceutical ingredients.