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Measurement of pH to quantify urease activity
1Department of Medical Biophysics, University of Manchester, UK.
Journal of Biochemical and Biophysical Methods
|December 1, 1992
Summary
This study quantifies urease activity by measuring pH changes from urea hydrolysis. An empirical formula relates urease activity to the initial rate of pH change, aiding enzyme assay development.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Urease enzyme catalyzes urea hydrolysis.
- Accurate measurement of urease activity is crucial for various applications.
Purpose of the Study:
- To establish a quantitative relationship between urease activity and the rate of pH change.
- To develop a reliable method for assaying urease enzyme concentrations.
Main Methods:
- Measured the rate of pH change from urea hydrolysis across 18 urease concentrations.
- Employed a titrimetric method to determine urease activity (A) in IU/cm3.
- Correlated initial rate of pH change ((dpH/dt)0) with urease activity.
Main Results:
- An empirical relationship was derived: A = 549(dpH/dt)0 - 1423(dpH/dt)2(0) for activities between 0.6-38 IU/cm3.
- The initial rate of pH change was sensitive to urease activity changes as small as 0.6 IU/cm3.
- Established a reliable assay for urease activity.
Conclusions:
- The study successfully established an empirical relationship for quantifying urease activity.
- The developed method allows for sensitive detection of urease enzyme concentrations.
- This provides a foundation for standardized urease activity assays.