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Rapid qualitative protease microassay (RPM)
1Department of Biochemistry and Molecular Biology, Mississippi State University, MS 39762, USA.
Journal of Biochemical and Biophysical Methods
|August 23, 2005
Summary
A new rapid qualitative protease microassay (RPM) allows visual determination of protease activity in minutes. This sensitive method offers a quick alternative for analyzing cysteine proteases in HPLC fractions.
Area of Science:
- Biochemistry
- Analytical Chemistry
Background:
- Conventional protease assays can be time-consuming.
- High-performance liquid chromatography (HPLC) is often used for fractionating biological samples, requiring subsequent activity analysis.
Purpose of the Study:
- To develop a rapid qualitative protease microassay (RPM) as an alternative to conventional methods.
- To enable quick visual determination of protease activity in HPLC fractions.
Main Methods:
- Development of a microassay utilizing a Coomassie Brilliant Blue stained substrate.
- Visual monitoring of substrate decolorization to indicate protease activity.
- Testing sensitivity with papain and detection in dilute HPLC fractions.
Main Results:
- The RPM provides visual results within 5 minutes.
- Sensitivity was demonstrated to 3.3x10(-7) U/mL of papain.
- Cysteine protease activity was detected in dilute HPLC fractions at 5.4x10(-5) U/mL.
Conclusions:
- The RPM is a rapid and sensitive method for detecting cysteine protease activity.
- The assay's principle allows for modification to detect other protease classes.
- This technique offers a valuable alternative for analyzing protease activity in complex samples like HPLC fractions.