Does the purity of enzymes in the Rapid Integrated Total Dietary Fiber Assay Kit (K-RINTDF) need to be tested often?

All dietary fiber enzymes supplied by Megazyme (supplied as single product or kit components) are subject to stringent QC analysis to ensure the correct activity and purity (the absence of undesirable enzymatic activities). 

K-TDFC is developed to help customers to evaluate dietary fiber analyses carried out in their own laboratories  and also to check if the enzymes have not been contaminated during storage in the end users lab if necessary.

The products supplied by Megazyme are of the highest quality and should work if stored properly at the correct conditions stated on the labels.