Planning of science instruction on digestion with using a substitute starch

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  • 代用デンプンを用いた消化に関する授業デザイン
  • ダイヨウ デンプン オ モチイタ ショウカ ニ カンスル ジュギョウ デザイン

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Abstract

<p>A novel dextrin ( Cluster Dextrin), that is easy to prepare due to the high solubility, was used as a substitute starch, in order to plan a new science instruction on experiments for understanding the function of saliva. Because of disturbance by iodine to the glucose-detection reaction, the substitute starch solution stained with iodine, which is used for the colordisappearance experiment by saliva, cannot use directly for the successive glucose-detection reaction. Therefore, we divided it two processes. The first experiment is DHl (Daeki-noHatrakijikken 1); in order to see the digestion process, the developed color with iodine addition was disappeared by addition of saliva. The second experiment is DH2 (Daeki-no-Hatrakijikken 2); a substitute starch solution after digestion with saliva was divided into two half-volumes, one half is used for the glucose-detection reaction, and the other half is used for the check of digestion of the substitute starch with iodine addition. These experimental procedures are very simple and the materials that are used are cheap and convenient, therefore, every student can do these experiments by themselves. These experiments are able to be done within one-third of the one-unit class time. The shortening of time to conduct the experiments guarantees much time for the students to consider the results and discussion. This science instruction will, we speculate, promote the understanding of students on function of saliva and digestion.</p>

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