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Updated: Jun 19, 2026

Use of the Protease Fluorescent Detection Kit to Determine Protease Activity
Published on: August 4, 2009
THE INACTIVATION OF TRYPSIN : III. SPONTANEOUS INACTIVATION.
1Laboratories of The Rockefeller Institute for Medical Research.
Purified trypsin inactivation follows monomolecular kinetics. Products from protein breakdown stabilize trypsin, slowing inactivation and suggesting compound formation. Trypsin stability is pH-dependent, optimal at pH 5.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Trypsin is a key digestive enzyme.
- Understanding trypsin stability is crucial for its applications.
Purpose of the Study:
- To investigate the kinetics of purified trypsin inactivation.
- To determine the effect of protein breakdown products on trypsin stability.
- To explore the influence of pH on trypsin stability.
Main Methods:
- Kinetic analysis of trypsin inactivation rates.
- Assessing the impact of protein-derived substances on trypsin stability.
- Evaluating trypsin stability across a range of pH values.
Main Results:
- Purified trypsin inactivation closely follows monomolecular kinetics.
- Protein breakdown products stabilize trypsin, altering inactivation kinetics.
- Trypsin exhibits maximal stability at pH 5, with rapid degradation in extreme pH conditions.
- Protective effects are more pronounced when inhibitors are added initially.
Conclusions:
- Trypsin inactivation kinetics can be modeled by monomolecular reactions.
- A stable, inactive compound likely forms between trypsin and inhibitory substances.
- Optimal trypsin activity and stability are observed near neutral pH.
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