Aldoses are oxidised to different compounds based upon the reactants. The following are a few examples:

1. D-glucose is oxidised to aldonic acid called gluconic acid. In the same way, mannose and galactose yield mannoic and galactonic acids, respectively, with bromine water.
2. Strong oxidising agents such as concentrated HNO₃ can convert aldehyde as well as primary alcoholic groups to glucosaccharic acid, and galactose produces galactosaccharic and mucic acids.
3. Under specific conditions, sugar is oxidised to uronic acid. Glucose upon oxidisation produces glucuronic acid.

Glucoses produce glucuronic acid, whereas galactose and mannose yield galacturonic acid and mannuronic acid, respectively.