The normal variability with this product is +/- 5-7%. Check your blank value which should be less than 0.1. If this value increases with time, the substrate has been contaminated with enzyme and should be discarded.
Results obtained with Azo-Xylan (Birchwood) (S-AXBL / S-AXBP) seem unstable, and have dropped from 10,000 units to 850 units after 3 weeks?
Modified on: Fri, 25 Mar, 2016 at 10:49 AM
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