AATCC 103-2019用于测定商业上用于纺织品退浆的细菌淀粉酶。不适用于除α淀粉酶外还含有β淀粉酶的产品。糊化淀粉酶活性是根据产生颜色变化所需的消化时间来测量的，颜色变化表示淀粉底物糊化的特定阶段。用细菌淀粉酶单位（BAU）表示的样品淀粉酶含量很容易从糊化时间计算出来。

AATCC 103-2019 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.