The present invention provides a process for obtaining n+a oxidation and reduction products from a mixture of n sugars selected from the group consisting of C5 and C6 sugars, wherein n is at least 2 and a is at least 1, wherein at least two of the sugars in the mixture are present at a non-equimolar ratio to each other, wherein, in a first stage, at least one of the sugars which are present at a non-equimolar ratio to each other is oxidized enzymatically and, at the same time, at least one of the other sugars present at a non-equimolar ratio to each other is reduced enzymatically, and wherein, in the first stage, a portion of at least one of the sugars present at a non-equimolar ratio to each other is not converted, and which is characterized in that, in at least a second stage, at least a portion of the sugar not converted in the first stage is oxidized enzymatically by half and, respectively, is reduced enzymatically by the remaining half.

The present invention provides a process for obtaining n+a oxidation and reduction products from a mixture of n sugars selected from the group consisting of C5 and C6 sugars, wherein n is at least 2 and a is at least 1, wherein at least two of the sugars in the mixture are present at a non-equimolar ratio to each other, wherein, in a first stage, at least one of the sugars which are present at a non-equimolar ratio to each other is oxidized enzymatically and, at the same time, at least one of the other sugars present at a non-equimolar ratio to each other is reduced enzymatically, and wherein, in the first stage, a portion of at least one of the sugars present at a non-equimolar ratio to each other is not converted, and which is characterized in that, in at least a second stage, at least a portion of the sugar not converted in the first stage is oxidized enzymatically by half and, respectively, is reduced enzymatically by the remaining half.