Catalyzes the oxidation of D-glucitol (sorbitol) to D- fructose, galactitol to D-tagatose and of L-iditol. DHSO_RHOSH 256 smoS MRLDGKTALITGSARGIGRAFAEAYVREGARVAIADINLEAARATAAEIGPAACAIALDVTDQASIDRCVAELLDRWGSIDILVNNAALFDLAPIVEITRESYDRLFAINVSGTLFMMQAVARAMIAGGRGGKIINMASQAGRRGEALVGVYCATKAAVISLTQSAGLNLIRHGINVNAIAPGVVDGEHWDGVDAKFADYENLPRGEKKRQVGAAVPFGRMGRAEDLTGMAIFLATPEADYIVAQTYNVDGGNWMS polS Sorbitol dehydrogenase Polyol dehydrogenase L-iditol 2-dehydrogenase