anomer

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anomer

[′an·ə·mər]
(organic chemistry)
One of a pair of isomers of cyclic carbohydrates; resulting from creation of a new point of symmetry when a rearrangement of the atoms occurs at the aldehyde or ketone position.
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In solution, glucose may exist as one of two possible anomers, termed [alpha] and [beta], or as the open-chain glucose aldehyde.
It was observed that during per acetylation, a mixture of both [alpha] and [beta] anomers is formed in a 3:1 ratio.
The weak bands observed near 926 [cm.sup.-1] and 760 [cm.sup.-1] are [alpha] anomers of pyranose compounds.
Inhibition of gastric motility induced by hepatic portal injections of D-glucose and its anomers. J Physiol 1984; 351: 573-581, doi: 10.1113/ jphysiol.1984.sp015263.
Meanwhile, lectins have unique ability to distinguish subtle structural differences among saccharides, e.g., epimers, anomers, and linkage isomers, etc.
Since the anomeric hydroxyl group of the glucose moiety of 6 is unacylated, it may be obtained as anomers ([alpha]- and [beta]-forms) mixture.
Figure 4 illustrates the separation of saccharides at high pH, with 0.1% ammonia, and high temperature to prevent double chromatographic peaks due to the formation of anomers. In this type of application, PGC also is stable under high temperature and high pH.
Glucose undergoes mutarotation between its different anomers. It is postulated that the glucose a-anomers bind faster than the [beta\-anomers, but the overall response is poor because the relative abundance of [alpha]-anomers is low and interconversion between the different diastereoisomers is slow.