THE INFLUENCE OF INORGANIC IONS ON THE ACTIVITY OF AMYLASES
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1. The effect of strong deionization from the amylase ]solutions upon their activities is summarized as follows; (a) The activity of human salivary amylase deionized by ion ex-change resing was only 0.04 per cent of the activity displayed in the presence of a sufficient amount of NaCl, and the decreased ac-tivity was recovered even by an extremely small amount of various ions, for example, 10-8M of NaCl. (b) The activity of Taka-α.-amylase was not influenced at all by treatment with ion exchange resin. (c) Bacterial-α-amylase showed a behavior toward inorganic ions which situated between animal amylases and Taka-o-amylase. 2. Ions in salt solution act completely independently. Thus the activation by NaC1 of salivary amylase is due solely to Cl-, and not to Na+ at least when the concentration of NaC; low. 3. The action of about 40 kinds of inorganic salts upon activities of the amylases was studied in the presence of buffer ions. 4. It was shown that both the "dextrinizing action" and the "saccharifying action" of amylases were influenced by various in-organic salts to an equal extent. The author wishes sincerely to dedicate many thanks to Prof. Shimazono of this department for his valuable instruction during this experiment and Miss Wata-nabe, the Department of Biochemistry, Institute of Public Health, for her technical assistance. The author wishes to express his thanks to Prof. Akabori and Dr. Okazaki for their kind supply of the samples.
- 社団法人 日本生化学会の論文
社団法人 日本生化学会 | 論文
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- THE INFLUENCE OF INORGANIC IONS ON THE ACTIVITY OF AMYLASES