利用碘液中的分子碘来检验淀粉的存在 ,是一个即方便又实用的好方法。我们在新教材的实验教学中却发现 ,使用碘分子检验淀粉的存在是有条件的。首先是温度。“温度对酶活性的影响”的实验中 ,淀粉酶经高温处理后 ,便会失去活性 ,不能使淀粉水解 ,加入碘液后 ,淀粉呈现蓝色。如 The use of molecular iodine in iodine solution to test the presence of starch is a convenient and practical method. We discovered in the experimental teaching of the new textbook that the use of iodine molecules to test the existence of starch is conditional. The first is temperature. In the experiment of “effect of temperature on enzyme activity”, amylases lost their activity after high temperature treatment, and could not hydrolyze starch. After adding iodine solution, the starch appeared blue. Such as