The starchy carbohydrates contained in potatoes remain virtually indigestible before they're cooked, and provide minimal nutritional value or fuel. When these starches are cooked, they go through a process called gelation,during which their starch molecules become digestible for the human body. 31 янв. 2018 г.
What happens to potatoes when cooked?
When you bake a potato, the starch granules absorb the moisture within the potato. Within the confines of the potato skin, moisture soon turns to steam that expands with great force, separating the starch granules and making a fluffy baked potato.
Is cooking a potato a chemical change?
Potatoes are largely starch; cooking (heating with water) causes chemical changes in the structure of these starches, similar to those that occur in rice (which is almost predominantly starch). Potatoes have relatively large starch granules- up to 0.1mm in size.
What chemical changes happen when a potato is heated?
Upon heating the potato, the starch granules in the cell will start to absorb more and more water, swelling up as a result. At some point, the starch granules burst. Each starch granule contains a lot of individual starch molecules made up of amylose and amylopectin.
Does potato shrink when cooked?
Potatoes do shrink when cooked because they lose the water content. Uncooked potatoes are made of 21% of dry mass, (60-80% of potato mass is starch) and 79% of water. Depending on the cooking method, potatoes can lose anywhere from 2-40% of their weight.