Starch does not pass through the semipermeable membrane because starch molecules are too large to fit through the small pore of the dialysis bag membrane.
Dialysis bags or tubings are made as a mimic for the cellular membrane which acts as a semipermeable membrane. These membranes have pores to allow small molecules to permeate through them.
They mimic cellular membrane activities such as diffusion and osmosis. These dialyzing membranes are made up of nanoporous polymers such as cellulose, cellulose acetate, PES, etc.
In contrast to starch, glucose, iodine, and water molecules are small enough to pass through the membrane.
Diffusion and osmosis move substances from higher concentration to lower concentration.
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