LAST DIGESTION & ABSORPTION
TARGET
2. Use dialysis tubing to model absorption of digested food in the
intestine.
What is the point of digestion? T-PS an answer to this question, using
carbohydrates as a example.
WWK: Dialysis tubing (aka visking tubing)
a type of semi-permeable membrane tubing used in
separation techniques that facilitates the removal or
exchange of small molecules from macromolecules in
solution based on differential diffusion  a form of
passive membrane transport
Design a method to use dialysis tubing to model
absorption of digested food in the intestine.
In a
group of
3,
create a
diagram
of your
model.
• Benedict’s reagent
• 1% starch solution • Vernier temp.
probes
• 1% amylase
• Iodine
solution
• Water bath kept
• Glassware
at 40*C
• Dialysis tubing
• Tap water
• Glass
• Hot plates - 3
thermometers
• Biuret’s solution • Distilled water
Materials: