Dictionary > Ketose

Ketose

Definition
noun, plural: ketoses
A monosaccharide with a ketone as its carbonyl group
Supplement
A carbohydrate is an organic compound consisting of carbon, hydrogen, and oxygen. Carbohydrates are classified into monosaccharides, disaccharides, oligosaccharides, and polysaccharides. The monosaccharides are the simplest forms of carbohydrates, and are further classified based on the carbonyl group they contain. Accordingly, monosaccharides may be aldose or ketose. While an aldose is a monosaccharide containing an aldehyde group (-CHO), a ketose is one that contains a ketone (C=O). A ketose serves as a reducing sugar. However, those that are bound into the glycosides are non-reducing sugar.
Ketoses may be classified based on the number of carbons in the main chain. For example, a three-carbon ketose is referred to as a triose. An example of this is dihydroxyacetone. Tetroses are four-carbon ketoses. An example is erythrulose. Pentoses are five-carbon ketoses and examples are ribulose and xylulose. Hexoses are six-carbon ketoses. Examples include fructose, sorbose, and psicose. Heptoses are seven-carbon ketoses, such as sedoheptulose. Octoses are eight-carbon ketoses (e.g. D-manno-octulose). Nanoses are nine-carbon ketoses (e.g. D-glycero-D-galacto-nonulose).
One way to chemically identify a ketose from an aldose is through Seliwanoff’s test. Aldoses produce a light pink color whereas ketoses produce a dark red color. To isomerize a ketose into an aldose, Lobry-de Bruyn-van Ekenstein transformation is applied.
See also:


You will also like...

Pink Lotus plant on a pond
Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

genes controlling growth and development
Control of Growth & Development

Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

Selective Breeding
Selective Breeding

Gregor Mendel's studies into Monohybrid and Dihybrid crossing and Charles Darwin's study of evolution and natural select..

Genetic Mutations
Chromosome Mutations – II

This tutorial is a continuation of the first lesson on chromosomal mutation. Here, find out the chromosomal aberrations ..

Balanced Diet
A Balanced Diet – Minerals and Proteins

Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..