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In chemistry, a Haworth projection is a common way of writing a structural formula to represent the cyclic structure of monosaccharides with a simple three-dimensional perspective. Haworth projection approximate the shapes of the actual molecules better for furanoses —which are in reality nearly planar—than for pyranoses that exist in ...
Allulose, also known by its systematic name D-ribo-2-hexulose as well as by the name D-psicose, is a monosaccharide and a ketohexose. [ 2 ] [ 11 ] It is a C3 epimer of fructose . [ 2 ] Fructose can be converted to allulose by the enzymes D -tagatose 3-epimerase ( EC 5.1.3.31 ) and/or D -psicose 3-epimerase ( EC 5.1.3.30 ), which has allowed for ...
l-Glucose is an organic compound with formula C 6 H 12 O 6 or O=CH[CH(OH)] 5 H, specifically one of the aldohexose monosaccharides. As the l-isomer of glucose, it is the enantiomer of the more common d-glucose. l-Glucose does not occur naturally in living organisms, but can be synthesized in the laboratory.
In chemistry, a hexose is a monosaccharide (simple sugar) with six carbon atoms. [1] [2] The chemical formula for all hexoses is C 6 H 12 O 6, and their molecular weight is 180.156 g/mol. [3] Hexoses exist in two forms, open-chain or cyclic, that easily convert into each other in aqueous solutions. [4]
N-Acetylglucosamine molecule. N-Acetylglucosamine (GlcNAc) is an amide derivative of the monosaccharide glucose.It is a secondary amide between glucosamine and acetic acid.It is significant in several biological systems.
Haworth projection of the chitin molecule. A close-up of the wing of a leafhopper ; the wing is composed of chitin. A cicada emerges from its nymphal exoskeleton; the shed exoskeleton is mostly modified chitin ( sclerotin ) but the wings and much of the adult body are still unsclerotized chitin at this stage
Haworth Projection of β-D-glucopyranose Hermann Emil Fischer won the Nobel Prize in Chemistry (1902) for his work in determining the structure of the D - aldohexoses . [ 1 ] However, the linear, free-aldehyde structures that Fischer proposed represent a very minor percentage of the forms that hexose sugars adopt in solution.
2, 3 = Haworth projections. 4 = Mills projection. Every two anomers are designated alpha (α) or beta (β), according to the configurational relationship between the anomeric centre and the anomeric reference atom , hence they are relative stereodescriptors . [ 2 ]