Maltose is composed of two glucose molecules linked by an α-1,4-glycosidic bond. First glucose unit has a hemiacetal group which can open to form an aldehyde, giving maltose its reducing properties. While second glucose unit has an acetal group at its anomeric carbon which is involved in the glycosidic bond. This acetal carbon cannot open up to form an aldehyde. This combination allows maltose to act as a reducing sugar.
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This really helped clarify thank you!
But maltose also acetal group then why is it reducing
Maltose is composed of two glucose molecules linked by an α-1,4-glycosidic bond. First glucose unit has a hemiacetal group which can open to form an aldehyde, giving maltose its reducing properties. While second glucose unit has an acetal group at its anomeric carbon which is involved in the glycosidic bond. This acetal carbon cannot open up to form an aldehyde. This combination allows maltose to act as a reducing sugar.