The Glucose molecule - rotatable in 3 dimensions

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Glucose (also known as dextrose or blood sugar) is a monosaccharide - formula C6H12O6.

It is an example of a 6-carbon (hexose) sugar. Label / unlabel Carbon numbers.

Notice the 6 carbon atoms (grey) forming the backbone of the molecule, and the oxygen atom (red) in the ring.

The hydrogen atoms (white) are either attached directly to the carbons, or via oxygen as OH groups - at an angle.

The glucose molecule can form into other configurations, but this structure - a ring or chair form - is the most stable and therefore most common in biological systems.

The ring itself is 6-sided, but only 5 of its corners are made up by carbon atoms.
Only the carbon outside the ring (number 6) has 2 single hydrogens and an OH group.

The glucose molecule in this form is known as α-D-glucopyranose, as the central part of the molecule is similar to pyran - a six-membered heterocyclic ring-shaped compound with five carbon atoms and one oxygen.

It is in equilibrium with a open-chain form in which Carbon 1 forms a CHO aldehyde group which gives it reducing properties, so that it reacts with reagents such as Benedict's.

Glucose is a component of other biological molecules: maltose, lactose, sucrose, cellobiose, amylose, amylopectin, glycogen.
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Books & other info about glucose


Web references

Glucose From Wikipedia, the free encyclopedia
D-glucose: from Fischer projection, via 3D glucopyranose, to Haworth projection - an animated tutorial from the Centre for Molecular and Biomolecular Informatics, part of the Faculty of Science of the Radboud University Nijmegen, The Netherlands.
Glucose tutorial from Elmhurst college, Illinois

Possibly relevant
material available online
(from Amazon.com)

Possibly relevant
material available online
(from Amazon.co.uk)