Disaccharides –
two sugar units bonded together
Disaccharides video clip
Disaccharides are formed in
condensation reactions
Maltose (two glucose units)
provides energy for germinating
seeds.
H2 O
Maltose – between which carbon
#’s are the glucoses connected?
H2 O
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.
BILL
• 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.
Using the molecular model kits:
BUILD MALTOSE
Notice orientation of hydroxyl (-OH)
groups. STAMP WHEN COMPLETE