Ketose: Difference between revisions
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{{Short description|A type of monosaccharide containing a ketone group}} | |||
{{Use dmy dates|date=October 2023}} | |||
'''Ketose''' is a type of [[monosaccharide]] (simple sugar) that contains a [[ketone]] group. Ketoses are important in various biological processes and are found in many natural sources. Unlike [[aldoses]], which contain an [[aldehyde]] group, ketoses have a carbonyl group (C=O) located at the second carbon atom of the sugar chain. | |||
== | ==Structure== | ||
Ketoses are characterized by the presence of a ketone group, which is a carbon atom double-bonded to an oxygen atom (C=O). This group is typically located at the second carbon atom in the sugar chain, distinguishing ketoses from aldoses, where the carbonyl group is at the terminal carbon. | |||
== | ===Common Ketoses=== | ||
Some common ketoses include: | |||
== | * '''[[Dihydroxyacetone]]''' - The simplest ketose, with the chemical formula C_H_O_. It is a triose, meaning it contains three carbon atoms. | ||
* '''[[Fructose]]''' - A hexose sugar with the formula C_H__O_, commonly found in fruits and honey. It is one of the most important ketoses in human metabolism. | |||
* '''[[Ribulose]]''' - A pentose sugar with the formula C_H__O_, involved in the [[Calvin cycle]] of photosynthesis. | |||
==Biological Importance== | |||
Ketoses play crucial roles in various metabolic pathways. For example, fructose is a key player in the [[glycolysis]] pathway, where it is phosphorylated and converted into intermediates that enter the energy-producing cycles of the cell. | |||
===Metabolism=== | |||
In the human body, ketoses are metabolized through pathways such as glycolysis and the [[pentose phosphate pathway]]. Fructose, for instance, is converted into fructose-1-phosphate by the enzyme [[fructokinase]], and then further processed into intermediates that can be used for energy production or biosynthesis. | |||
==Sources== | |||
Ketoses are naturally found in various foods. Fructose, for example, is abundant in fruits, vegetables, and honey. It is also a component of [[sucrose]], a disaccharide composed of glucose and fructose. | |||
==Chemical Properties== | |||
Ketoses can undergo isomerization to form aldoses through a process called [[tautomerization]]. This isomerization is facilitated by the presence of an enediol intermediate, allowing the conversion between the ketone and aldehyde forms. | |||
==Images== | |||
[[File:Fructose.png|thumb|right|Structure of fructose, a common ketose.]] | |||
[[File:Dihydroxyacetone.png|thumb|left|Structure of dihydroxyacetone, the simplest ketose.]] | |||
==Related pages== | |||
* [[Monosaccharide]] | * [[Monosaccharide]] | ||
* [[ | * [[Aldose]] | ||
* [[Glycolysis]] | * [[Glycolysis]] | ||
* [[ | * [[Pentose phosphate pathway]] | ||
[[Category:Monosaccharides]] | [[Category:Monosaccharides]] | ||
[[Category:Carbohydrates]] | [[Category:Carbohydrates]] | ||
Latest revision as of 17:30, 18 February 2025
A type of monosaccharide containing a ketone group
Ketose is a type of monosaccharide (simple sugar) that contains a ketone group. Ketoses are important in various biological processes and are found in many natural sources. Unlike aldoses, which contain an aldehyde group, ketoses have a carbonyl group (C=O) located at the second carbon atom of the sugar chain.
Structure[edit]
Ketoses are characterized by the presence of a ketone group, which is a carbon atom double-bonded to an oxygen atom (C=O). This group is typically located at the second carbon atom in the sugar chain, distinguishing ketoses from aldoses, where the carbonyl group is at the terminal carbon.
Common Ketoses[edit]
Some common ketoses include:
- Dihydroxyacetone - The simplest ketose, with the chemical formula C_H_O_. It is a triose, meaning it contains three carbon atoms.
- Fructose - A hexose sugar with the formula C_H__O_, commonly found in fruits and honey. It is one of the most important ketoses in human metabolism.
- Ribulose - A pentose sugar with the formula C_H__O_, involved in the Calvin cycle of photosynthesis.
Biological Importance[edit]
Ketoses play crucial roles in various metabolic pathways. For example, fructose is a key player in the glycolysis pathway, where it is phosphorylated and converted into intermediates that enter the energy-producing cycles of the cell.
Metabolism[edit]
In the human body, ketoses are metabolized through pathways such as glycolysis and the pentose phosphate pathway. Fructose, for instance, is converted into fructose-1-phosphate by the enzyme fructokinase, and then further processed into intermediates that can be used for energy production or biosynthesis.
Sources[edit]
Ketoses are naturally found in various foods. Fructose, for example, is abundant in fruits, vegetables, and honey. It is also a component of sucrose, a disaccharide composed of glucose and fructose.
Chemical Properties[edit]
Ketoses can undergo isomerization to form aldoses through a process called tautomerization. This isomerization is facilitated by the presence of an enediol intermediate, allowing the conversion between the ketone and aldehyde forms.
