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13问答网 > 将面团包在纱布中放在清水中搓洗，粘留在纱布上粘稠物质并洗出的白浆，为什么没有糖类物质呢？

将面团包在纱布中放在清水中搓洗，粘留在纱布上粘稠物质并洗出的白浆，为什么没有糖类物质呢？

2025-03-15 20:41:50

推荐回答（1个）

回答1：

黏留在纱布上的是蛋白质。洗出的白浆是淀粉。蛋白质，用双缩脲试剂鉴定，显现紫色。而白浆是淀粉，碘液可以用于检验淀粉的存在，淀粉遇碘液变成蓝色。
淀粉是葡萄糖的高聚体，水解到二糖阶段为麦芽糖，完全水解后得到葡萄糖。

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