AATCC 103-2013

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Bacterial Alpha-Amylase Enzymes Used in Desizing, Assay Of (Reaffirmed – 2013)
standard by American Association of Textile Chemists and Colorists, 2013

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This test method is intended for the assay of bacterial amylases employed commercially for textile desizing. It is not applicable to products which contain beta-amylase in addition to alpha-amylase.

Dextrogenic amylase activity is measured in terms of digestion time required to produce a color change denoting a definite stage of dextrinization of the starch substrate. The amylase content of the sample, expressed in Bacterial Amylase Units (BAU), is readily calculated from the dextrinizing time.

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