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J. Dairy Sci. 89:3336-3344
© American Dairy Science Association, 2006.

Bioactive Peptides in Ovine and Caprine Cheeselike Systems Prepared with Proteases from Cynara cardunculus

S. V. Silva*, A. Pihlanto{dagger} and F. X. Malcata*,1

* Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Dr. António Bernardino de Almeida, P-4200-072 Porto, Portugal
{dagger} MTT Agrifood Research Finland, Food Research, FIN-31600 Jokioinen, Finland

1 Corresponding author: fxmalcata{at}esb.ucp.pt

The potential angiotensin-converting enzyme (ACE)–inhibitory and antioxidant activities of peptides in water-soluble extracts, obtained from raw and sterilized ovine and caprine cheeselike systems coagulated with enzymes from the plant Cynara cardunculus, were assessed. Prior to the assay, the 3,000-Da permeate from 45-d-old cheeselike systems was fractionated by tandem chromatographic techniques. Several peaks were obtained in each chromatogram, but only some were associated with ACE-inhibitory or antioxidant activity or both. Peptides Tyr-Gln-Glu-Pro, Val-Pro-Lys-Val-Lys, and Tyr-Gln-Glu-Pro-Val-Leu-Gly-Pro-* from ß-casein, as well as Arg-Pro-Lys and Arg-Pro-Lys-His-Pro-Ile-Lys-His-* from {alpha}s1-casein exhibited ACE-inhibitory activity. Peptides released upon cleavage of the peptide bond Leu190-Tyr191 (either in ovine or caprine ß-casein), and corresponding to the ß-casein sequence Tyr-Gln-Glu-Pro-*, possessed antioxidant activity.

Key Words: plant protease • ovine cheese • caprine cheese • angiotensin-converting enzyme inhibition




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