Why can two equal enzyme weights remove different amounts of stain?
A starch stain removed during a long wash may persist in the customer’s short cycle. Commercial product weight is not an activity basis.
Keep an enzyme-free short-cycle control
Fix the starch-soiled fabric lot, load and detergent formulation. Compare short and standard cycles with an enzyme-free blank. Record temperature, duration and stain removal and judge against the intended cycle.
Why does a long wash work better than the target short cycle?
Run parallel stain-swatch trials at the actual low temperature and short cycle time. Low-temperature laundering: Using the same lot of starch-stained test fabric, measure short-cycle cleaning and residual stain. Liquid formulations: Assess retained enzyme activity after storage and removal of the target stain.
Checking Amylase activity and Residual activity
Amylase activity (Units/g by supplier method): State the substrate and assay temperature. Residual activity (%): Agree the retained-sample conditions for the complete formulation. Target stain removal (Change in reflectance): Keep the test fabric, machine model and wash cycle constant.
What to record
- Test fabric type
- Enzyme activity basis
- Wash temperature
- Wash duration
- Stain-removal result
Technical references
Products and processes
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