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Bioactive peptides and free amino acids profiles in different types of European dry-fermented sausages.
International Journal of Food Microbiology 2018 July 3
A wide variety of dry-fermented sausages are produced in European countries, where are considered valued traditional products. An intense proteolysis takes place during the processing of dry-fermented sausages due to the combined action of muscle and microbial peptidases, generating large amounts of peptides and free amino acids. These compounds participate in the development of the characteristic flavor of dry-fermented products, but some peptides can also exert certain bioactivities such as antioxidant and ACE inhibitory activities. This study has evaluated the changes in peptide profile and amino acid contents of three European dry-fermented sausages produced in Spain, Italy and Belgium, proving the intense degradation of proteins, mainly myofibrillar, and the generation of high amounts of different size peptides and free amino acids. The changes observed between the profiles of European sausages could be due to differences in product formulation, processing conditions and starter cultures used, which influence the activity of enzymes, both from muscle and bacterial origin. On the other hand, the bioactivity profile of each type of dry-fermented sausage was evaluated through the measurement of the ACE inhibitory and antioxidant activities in water-soluble peptide extracts fractionated by size-exclusion chromatography. Spanish and Belgian dry-fermented sausages showed values of ACE inhibition around 85%, whereas Belgian samples presented the highest DPPH radical-scavenging activity and ferric reducing power capacity. These results evidence the potential of Spanish, Italian and Belgian dry-fermented sausages as natural sources of bioactive peptides, giving an added-value to these traditional products.
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