Degradation of Raw Starch Granules by α-Amylase Purified from Culture of Aspergillus awamori KT-11 = Degradation of Raw Starch Granules by α-Amylase Purified from Culture of Aspergillus awamori KT-11

다국어 초록 (Multilingual Abstract)

Raw-starch-digesting α-amylase (Amyl Ⅲ) was purified to an electrophoretically pure state from the extract of a koji culture of Aspergillus awamori KT 11 using wheat bran in the medium. The purified Amyl Ⅲ digested not only soluble starch but also raw corn starch. The major products from the raw starch using Amyl Ⅲ were maltotriose and maltose, although a small amount of glucose was produced. Amyl Ⅲ acted on all raw starch granules that it has been tested on. However, it was considered that the action mode of the Amyl Ⅲ on starch granules was different from that of glucoamylase judging from the observation of granules under a scanning electron microscope before and after enzyme reaction, and also from the reaction products. Glucoamylase (GA I) was also isolated and it was purified to an electrophoretically pure state from the extract. It was found that the electron micrographic features of the granules after treatment with the enzymes were quite different. A synergistic effect of Amyl Ⅲ and GA I was observed for the digestion of raw starch granules.