AATCC Test Method 103-2013
Bacterial Alpha-Amylase Enzymes

used in Desizing, Assay of

Developed in 1962 by AATCC Committee RA41; Jurisdiction transferred to RA34 in 1987 and returned to RA41 in 1993

1.  Purpose and Scope

1.1  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.

2.  Principle

2.1  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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