Disaccharides – two sugar units bonded together

Disaccharides video clip

Disaccharides are formed in condensation reactions

Maltose (two glucose units) provides energy for germinating seeds.

H2O

Maltose – between which carbon #’s are the glucoses connected?

H2O

Sucrose (glucose + fructose) is a transport form of sugar used by plants and harvested by humans for food.

Lactose (galactose and glucose) is present in milk

BILL

•Draw 2 glucoses next to each other. Try to do this without looking at notes.

• On your first glucose, highlight the hydroxyl (-OH) on carbon 1.

• On your second glucose, highlight the hydroxyl (-OH) on carbon 4.

BILL

Draw maltose formed when you connect the two glucoses in a condensation reaction.

BILL

Using the molecular model kits:

BUILD MALTOSE

Notice orientation of hydroxyl (-OH) groups. STAMP WHEN COMPLETE