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Difference between revisions of "Absolute configuration (D/L nomenclature)"
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| − | The absolute configuration of all monosaccharides is denoted by the configuration at one particular stereocentre in that sugar, namely the stereocentre furthest from the anomeric centre (the carbonyl carbon in the open chain representation). If, in the Fischer projection, that centre has the hydroxyl group on the right, it is a D-sugar; if on the left, it is an L-sugar. By convention, the "D" and "L" symbols are written in small capitals. | + | The absolute configuration of all monosaccharides is denoted by the configuration at one particular stereocentre in that sugar, namely the stereocentre furthest from the anomeric centre (the carbonyl carbon in the open chain representation) <cite>1</cite>. If, in the Fischer projection, that centre has the hydroxyl group on the right, it is a D-sugar; if on the left, it is an L-sugar. By convention, the "D" and "L" symbols are written in small capitals. |
The configurations of the other centres relative to this define the individual sugars, e.g. D-glucose, L-threose, etc. | The configurations of the other centres relative to this define the individual sugars, e.g. D-glucose, L-threose, etc. | ||
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[[Image:D-L sugars.png|centre]] | [[Image:D-L sugars.png|centre]] | ||
<center>'''Fischer projections of representative sugars - the configurational "D" or "L" stereogenic centre is denoted with an asterix.'''</center> | <center>'''Fischer projections of representative sugars - the configurational "D" or "L" stereogenic centre is denoted with an asterix.'''</center> | ||
| + | ==References== | ||
| + | #1 Carbohydrates: The essential molecules of life, R.V. Stick, S.J. Williams, Elsevier, 2009, 474 pages. | ||
[[Category:Definitions and explanations]] | [[Category:Definitions and explanations]] | ||
Revision as of 03:46, 20 July 2009
The absolute configuration of all monosaccharides is denoted by the configuration at one particular stereocentre in that sugar, namely the stereocentre furthest from the anomeric centre (the carbonyl carbon in the open chain representation) [1]. If, in the Fischer projection, that centre has the hydroxyl group on the right, it is a D-sugar; if on the left, it is an L-sugar. By convention, the "D" and "L" symbols are written in small capitals.
The configurations of the other centres relative to this define the individual sugars, e.g. D-glucose, L-threose, etc.
References
- 1 Carbohydrates: The essential molecules of life, R.V. Stick, S.J. Williams, Elsevier, 2009, 474 pages.