The various amylase assay methods all measure how well the enzyme will hydrolyze gelatinized starches to dextrins and sugars.
The RAU (Reference Amylase Unit) is typically used for amylases derived from bacterial sources.
Assay – Amylase RAU
The SKB typically is used for amylases derived from fungal sources. However it can be used for bacterial sources as well.
Assay – SKB