Maltose is a disaccharide
- formula C12
- consisting of two glucose units (12 carbon atoms, and 2 ring-shaped structures, each containing an oxygen atom).
Each glucose unit is effectively the same way up, a reflection of the arrangement in starch - especially amylose. This can be seen when the carbon 6 and associated groups
H bonds between these sections.
The two sugars are linked via a glycosidic bond - an
α (alpha) 1-4 bond
between opposite sides of the 2 glucose molecules.
This bond - effectively an oxygen bridge - is formed as a result of a condensation reaction
bonding carbon atom numbers.
Note that as in glucose, one of these ring-shaped sections is in equilibrium with a open-chain form in which Carbon 1 has a CHO aldehyde group
which gives it reducing properties
, so that it reacts with reagents such as Benedict's.