Related Experiment Video
Updated: May 27, 2026

One-step Extraction and Zymographic Analysis of Bacterial Gelatinases
Published on: August 1, 2025
Proteolysis in dry fermented sausages: The effect of selected exogenous proteases
O Díaz1, M Fernandez, G D De Fernando
1Departamento de Nutrición y Bromatología III (Higiene y Tecnología de los Alimentos), Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain.
Abstract:
The effect of three commercial proteases (pronase E from Streptomyces griseus, aspartyl proteinase from Aspergillus oryzae and papain) on protein breakdown and the sensory characteristics of dry fermented sausages was investigated. Water soluble, non-protein, 5% phosphotungstic acid soluble, 5% sulphosalicylic acid soluble and total volatile basic nitrogen contents increased during fermentation, stabilizing later until the end of ripening (26th day). Nitrogen values were always greater in the aspartyl proteinase added batch in comparison with the other protease added batches. Total free amino acid changes showed a similar pattern to those observed for the 5% sulphosalicylic acid soluble nitrogen. The electrophoretic studies demonstrated that proteolysis of high molecular weight myofibrillar and sarcoplasmic proteins was more prominent in protease added batches. It was especially intensive in papain one. The dominant amino acids at the end of ripening were similar in all batches. Tyramine and histamine increased throughout ripening. No significant differences in sensory properties were found between control and pronase E and papain added batches, but they were significantly different (p < 0.01) from the sausages containing aspartyl proteinase, due to an excessive softening. The effect of exogenous enzyme addition on the flavour potentiation of dry fermented sausage is discussed.
Related Concept Videos
Microbes in the Production of Fermented Foods
Microbes in Food Production
Protein Digestion
Production of Organic Acids
Production of Alcohol
Amino Acid Catabolism

