Psychology Wiki


34,203pages on
this wiki
Add New Page
Talk0 Share

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)

Monosaccharides are the simplest form of carbohydrates. They consist of one sugar and are usually colorless, water-soluble, crystalline solids. Some monosaccharides have a sweet taste. Examples of monosaccharides include glucose (dextrose), fructose, and galactose.

Monosaccharides are the building blocks of disaccharides like sucrose (common sugar) and polysaccharides (such as cellulose and starch). Further, each carbon atom that supports a hydroxyl group (except for the first and last) is chiral, giving rise to a number of isomeric forms all with the same chemical formula. For instance, galactose and glucose are both aldohexoses, but they have different chemical and physical properties.

Structure Edit


Fructose, a monosaccharide, as a Haworth projection.

With few exceptions (e.g. deoxyribose), monosaccharides have the empirical chemical formula (CH2O)n and the chemical structure H(CHOH)nC=O(CHOH)mH. If n or m is zero, it is an aldose, otherwise it is a ketose. Monosaccharides contain either a ketone or aldehyde functional group, and hydroxyl groups on most or all of the non-carbonyl carbon atoms.

Cyclic structure Edit

Most monosaccharides form cyclic structures, which predominate in aqueous solution, by forming hemiacetals or hemiketals (depending on whether they are aldoses or ketoses) with themselves. Glucose, for example, forms a hemiacetal linkage between its carbon-1 and the hydroxyl group of its carbon-5. Since such a reaction introduces an additional chiral center, two anomers are formed from each distinct straight-chain monosaccharide. The interconversion between these two forms is called mutarotation.

A common way of representing the cyclic structure of monosaccharides is the Haworth projection.

Isomerism Edit

The total number of possible stereoisomers of one compound (n) is dependent on the number of chiral centers (c) in the molecule: n = 2c.

Monosaccharide Nomenclature Edit

Monosaccharides are classified by the number of carbon atoms they contain:

Monosaccharides are classified the type of keto group they contain:

Monosaccharides are classified according to their molecular configuration at carbon 2:

All these classifications can be combined, resulting in names like D-aldohexose or ketotriose.

List of monosaccharides Edit

This is a list of some common monosaccharides, not all are found in nature - some have been synthesised:

Reactions Edit

  1. Formation of acetals.
  2. Formation of hemiacetals and hemiketals.
  3. Formation of ketals.

See also Edit

External links Edit

This page uses Creative Commons Licensed content from Wikipedia (view authors).

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.

Also on Fandom

Random Wiki