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Glucoamylase activity in industrial enzyme preparations using colorimetric enzymatic method: collaborative study
1Novo Nordisk Biochem, Inc., Franklinton, NC 27525-0576, USA.
Journal of AOAC International
|March 1, 1995
Summary
A new colorimetric assay for determining glucoamylase activity in industrial enzyme preparations was validated. This enzymatic method demonstrated reliable performance, achieving good repeatability and reproducibility, and was adopted by AOAC INTERNATIONAL.
Area of Science:
- Enzymology
- Analytical Chemistry
- Industrial Biotechnology
Background:
- Accurate determination of glucoamylase activity is crucial for industrial enzyme preparations.
- Validation of analytical methods ensures reliable quality control in enzyme production.
Purpose of the Study:
- To collaboratively validate a colorimetric enzymatic assay for glucoamylase determination.
- To assess the method's performance in terms of repeatability and reproducibility across multiple laboratories.
Main Methods:
- A collaborative study involving fifteen laboratories.
- Analysis of blind duplicate samples from three industrial producers over three days.
- Statistical performance evaluation according to AOAC guidelines.
Main Results:
- Initial repeatability relative standard deviation (RSDr) ranged from 0.89% to 2.37%.
- Initial reproducibility relative standard deviation (RSDR) ranged from 7.92% to 9.86%.
- After outlier exclusion, RSDr ranged from 0.74% to 2.24%, and RSDR ranged from 3.46% to 8.92%.
Conclusions:
- The colorimetric enzymatic method provides reliable and reproducible results for glucoamylase determination.
- The validated method has been adopted as a first action by AOAC INTERNATIONAL.
- This assay is suitable for quality control of industrial enzyme preparations.