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dextrorotatory
adjective
That rotates the plane of polarized light to the right, or clockwise.
Exact(6)
Amino acids rotate light to the left, whereas sugars, called dextrorotatory, rotate it to the right.
Levorotatory amino acids are absorbed extremely rapidly much more rapidly than are dextrorotatory amino acids.
An example is the pair consisting of either of the two optically active forms of tartaric acid (either the dextrorotatory or levorotatory form) and the optically inactive meso form of the same acid (mesotartaric acid).
A substance with a positive specific rotation is described as dextrorotatory and denoted by the prefix d or ; one with a negative specific rotation is levorotatory, designated by the prefix l or.
If the linkage between the monosaccharides composing sucrose is broken, the optical rotation value of sucrose changes from positive to negative; the new value reflects the composite rotation values for D-glucose, which is dextrorotatory (+52°), and D-fructose, which is levorotatory (−92°).
Racemic acid, or, more properly, racemic tartaric acid, is a mixture of equal amounts of dextrorotatory and levorotatory tartaric acids; it is customarily designated dl- or -tartaric acid.
Similar(1)
It is common, therefore, to designate both, as, for example, D- l -fructose or D- l -fructose i.e., both have a D- l -fructosen at the centre or asymmetry most remote from the alD- d -glucosen glucose) or keto enD- d -glucosee) of the molecule, but fructose is levorotatory anD- d -glucosedextrorotatory—hence the latter has been given the alternative name dextrose.e
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