切好的土豆放入冰箱保鲜室贮存为什么会变色?切好的土豆丝、片放入冰箱保鲜室贮存,很容易变成暗灰色,而在常温下贮存则这种变色反应发生的比较缓慢,这是什么原因呢?土豆中的淀粉在较高或较低的温度条件下会发生降解反应,生成小分子糖。而这种降解反应的发生首先需要土豆本身存在的淀粉酶的参与。在土豆的块茎中还存在一种酶叫做转化酶,这种酶不是土豆中的故有酶,而是在淀粉降解过程中随着小分子糖的积聚量增多而产生出来的一种 Chopped potatoes into the refrigerator fresh storage Why discoloration? Cut potato silk, into the refrigerator fresh room storage, it is likely to become dark gray, while stored at room temperature, this discoloration reaction occurs more slowly, What is the reason? Starch in potatoes undergoes degradation reactions at higher or lower temperatures to produce small molecule sugars. This degradation reaction first requires the presence of amylase in potato itself. In potato tubers there is also an enzyme called invertase, which is not an enzyme in potatoes, but in the starch degradation process with the accumulation of small molecules of sugar to produce a