Reaction catalyzed by galactitol 2-dehydrogenase (1.1.1.16), galactitol 2-dehydrogenase (L-tagatose-forming) (1.1.1.406)
+
NAD+
=
+
NADH
+
galactitol
+
NAD+
=
D-tagatose
+
NADH
+
H+
