Trehalose is a simple head-to-head dimer of glucose:
Like a lot of sugars, it holds onto water like crazy; some plants use it as a protectant in dry conditions.
Molecular biologists also use it in PCR; apparently, it stabilizes the enzyme, while destabilizing the dsDNA produced by the reaction.
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I think you should check your stereochemistry. The ring on the right looks like L-glucose to me... looks like its wrong on Wikipedia too if thats where you got the structure.
Looks OK to me on 2nd glance. Remember, they're both alpha-, so one will look a little wonky...
Try building a molecular model of one ring and superimposing it on the other. They should match; they dont.
My mistake, thanks for being insistent about it. Fixed.
Carbohydrates are tricksy. I recently spotted 3 or 4 similar errors in the online catalog of a fairly major chemical supplier (all fixed now). Buyer beware.
What's the origin of the name of this carbohydrate? Trehalose, sounds like three halos, but there are really only two ;-) I have to assume it's not related to psicose although all these sugars are going to my head
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