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这一实验是根据淀粉遇碘变蓝的化学性质,来验证唾液淀粉酶对淀粉的消化作用。 按实验要求,取1g干淀粉放在烧怀里,加清水100mL煮沸,作成浆糊备用。这种方法费时间,还有两个明显的缺点:①浆糊遇碘显紫红色,这与学生从小学以来一直接受淀粉遇碘液变蓝色的认识相矛盾。②浓稠的浆糊中,由于含有较多的淀粉,所以在与唾液淀粉酶发生反应时,需要较长时间,有时唾液少了还难以消色(碘液在淀粉液中显什么颜色是由淀粉液的浓度决定的。浓度低时显蓝色,浓度高时显
This experiment was based on the chemical nature of starch iodine blue, to verify the digestion of starch by saliva amylase. According to the experimental requirements, take 1g of dried starch on the boiled boil, add 100mL of fresh water to boil, make a paste for use. This method takes time, there are two obvious shortcomings: 1 paste case of iodine was purple, which is consistent with the students from the primary school has been accepted starch iodine solution blue. 2 In a thick paste, because it contains more starch, it takes a long time to react with salivary amylase, and sometimes it is difficult to eliminate color due to less saliva (What is the color of iodine in starch solution? The concentration of starch liquid is determined, when the concentration is low, it is blue, when the concentration is high