epimer

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Related to epimers: Mutarotation, Anomers

epimer

[′ep·ə·mər]
(organic chemistry)
A type of isomer in which the difference between the two compounds is the relative position of the H (hydrogen) group and OH (hydroxyl) group on the last asymmetric C (carbon) atom of the chain, as in the sugarsD-glucose andD-mannose.
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The epimers (+)-catechin and (-)-epicatechin exhibited negligible affinities for both CB1 and CB2.
Stability of tea polyphenol (-)-epigallocatechin-3-gallate and formation of dimers and epimers under common experimental conditions.
Wright JLC, McInnes AG, Shimizu S, Smith DG, Walter JA, Idler D, Khalil W (1978) Identification of C-24 alkyl epimers of marine sterols by [.
In contrast to capillary zone electrophoresis (8, 9), these methods are reportedly not sensitive enough to measure hexosamines in small samples of tissue, and most are not able to separate the glucose-galactose epimers of UDP-hexosamines and UDP-hexoses (9).
Of particular interest is the C3 epimer of 25(OH)D, 3-epi-25(OH)D, which can be present at relatively high concentrations in sera from infants, but can also be found in sera from adults, albeit at lower concentrations (1,2).
8) showed that commonly used LC-MS/MS procedures may overestimate the 25(OH)D concentration when the C-3 epimer accounts for a substantial proportion of the circulating 25(OH)[D.
Schmidt's comments give the false impression that our recently published HPLC method (1) is unable to identify the presence of the C-3 epimer apart from 25(OH)[D.