Boiling of potatoes

Theory

Starch

https://clarissacagnato.weebly.com/starch-grain-analysis.html

• 2 organic polymers:large molecules composed of repeated sequences of units, attached by covalent chemical bonds).
• The structure of starch is made up of 2 different chains: linear helical amylase and branched amylopectin.
  • Amylase is soluble
  • amylopectin is insoluble.
• Starch is located in most plant tissues, particularly in storage organs such as rhizomes, tubers, and grains.

Starch is stored in organelles called amyloplasts within plant cells. These amyloplasts convert glucose into starch and store it for later use. Some plant roots and embryos, in the form of seeds and fruit, also serve as storage units for starch.

Thylakoid membrane

See also https://blogs.ubc.ca/biol343/the-plant-cell/

Parenchyma tissues of roots and tubers

Stroma

The stroma is the colorless, spongy cell matrix that supports the plant cell itself. In tubers, rhizomes and other starch-storing plant organs, it also acts as a place to store food for later use. When the plant needs the energy in the starch, it converts the starch grains back into glucose.

Read More: https://www.sciencing.com/where-is-starch-stored-in-plant-cells-12428011/

Starch grains inside potato cells (120x magn)

Potato starch contains typical large oval spherical granules ranging in size from 5 to 100 μm.

Starch gelatinization

1. Granule swelling
2. Melting of double helical structures
3. Amylose leaching

Gelatinization

The cell walls get broken.