# Carbohydrate configurations

I want to study several carbohydrates that includes but not limited to the following molecules:

1. Glucose
2. Galactose
3. Mannose
4. Fructose
5. Tagatose
6. Sorbose

I know that for any carbohydrate, possible list of carbohydrates isomers are

1. single chain (L and D isomer)
2. $\alpha$ and $\beta$ pyranose or six member ring structures
3. $\alpha$ and $\beta$ furanose or five member ring structures.

Now, for ring structures there are several rotamers, mainly gg, gt and tg (g=gauche, t=trans) and also there are several anomers but I am not sure about them. Is there anything I'm missing?

For accurate thorough computational study, I need to identify all the isomers. Is there any single book or document that can guide me to screen the full potential energy surface?

• Worth noting that $\alpha$ and $\beta$ conformations will interconvert with each other in solution, in the case of single, unsubstituted rings (i.e. hemiacetals equilibrate, acetals do not). So $\alpha$-D-glucopyranose and $\beta$-D-glucopyranose will interconvert in solution, as will any $\alpha$ and $\beta$ pair in the awesome chart above. But e.g. cellulose is a polymer of $\beta$-D-glucopyranose monomers, and in the polymer, there is no significant interconversion to $\alpha$. – Curt F. Jul 6 '15 at 15:26