Two ways to see the chemistry
Clear chemistry: labelled Haworth-style projections. These are reading conventions, not the flat shape of a molecule in solution. The monosaccharide drawings include ring oxygen and numbered carbons. Fructose is shown as β-D-fructofuranose, one of its possible forms. Pentoses are free β sugars; they are not whole nucleotides.
Disaccharide maps: simplified connectivity diagrams. They omit –OH/H substituents and do not encode all stereochemistry through bond angles. The labels identify the component sugars and the glycosidic linkage. The full computed structure is available in Molecular detail.
Embedded molecular data
Eleven molecular models are included. The chemical definitions of α-glucose (GLC), β-glucose (BGC), β-galactose (GAL), β-fructofuranose (FRU), β-ribofuranose (BDR) and 2-deoxy-β-ribofuranose (2DR) come from the wwPDB Chemical Component Dictionary. Glycosidic products were assembled from these definitions, preserving the specified stereochemistry. Sucrose was additionally checked against the BIRD sucrose definition.
The coordinates are computed, not experimentally measured. RDKit ETKDGv3 generates conformers and MMFF94 optimises them. A fixed calculated conformation is displayed; no dynamics, equilibrium populations or experimental measurements are implied. α and β glucose, and the pentose pair, are aligned by proper rotations without reflection.
Reaction boundaries
The bond builder retains the net condensation and hydrolysis animation from the original combined lab. One –OH and one H form water; the acceptor oxygen remains in the linkage. This is atom bookkeeping, not an elementary reaction mechanism or an exact cellular biosynthetic pathway. In Molecular detail the completed product is shown throughout, even when the reaction direction is set to hydrolysis; return to Clear chemistry for the reaction.
The reducing-end glucose is shown in its α form in maltose and lactose. It can also adopt β. These products have the same linkage identity in either case.
Reference material
- OpenStax: important monosaccharides, disaccharides and hydrolysis.
- wwPDB CCD / RCSB: GLC, α-D-glucopyranose. BGC, β-D-glucopyranose.
- FRU: β-D-fructofuranose. GAL: β-D-galactopyranose.
- BDR: β-D-ribofuranose. 2DR: 2-deoxy-β-D-ribofuranose.
- wwPDB BIRD: sucrose, PRD_900003.
- RDKit: molecular definitions and conformer generation.
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