Other sugar-derivatives can be used in this process including levulose (D-fructose), inulin and starch.

They can, for instance, separate levulose from fructose, though the molecules of these sugars are identical except that one is a mirror image of the other.

Examples of monosaccharides include glucose (dextrose), fructose (levulose), galactose, xylose and ribose.

For example, nine of the nineteen -amino acids commonly found in proteins are dextrorotatory (at a wavelength of 589 nm), and -fructose is also referred to as levulose because it is levorotatory.