All Questions
11
questions
-2
votes
1
answer
144
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Are the anomeric hydroxy groups of α-maltose and β-maltose, axial or equatorial, respectively?
This Q&A is a continuation from the following Q&A;
What do we get when we joint two α- glucoses via an α1,4 bond?
More straightforwardly, the question may focus on whether the bond represented ...
- 201
3
votes
1
answer
129
views
What do we get when we joint two α- glucoses via an α1,4 bond?
What do we get when we joint two α- glucoses via an α1,4 bond?
Is it alpha maltose or beta maltose?
In other words, if we cleave amylopectin with amylase (α-amylase or β-amylase), which form of ...
- 201
1
vote
0
answers
121
views
Why are glyosidic linkage of glucose and fructose rings often occurring at the 1' and 4' prime positions?
Here are some example combinations from my textbook:
In all of these combined products, the reactive centres seem to be the carbon at first position/ fourth position from the oxygen in priority. Is ...
6
votes
1
answer
73
views
Does the mechanism of AChE inhibition by Isoparathion depend on chirality?
It is known that the inhibition of acetylcholinesterase by isomalathion can proceed either with diethyl succinate as the leaving group or thiomethyl, depending on the specific stereoisomer of ...
- 1,264
2
votes
0
answers
85
views
Differences in efficacy of oxime reactivators in organophosphate poisoning
Compounds containing an oxime functional group, such as 2-PAM and obidoxime, are used in the treatment of poisoning with organophosphorus compounds. These oximes reactivate the enzyme ...
- 1,264
2
votes
2
answers
2k
views
Why do chiral biological molecules only exist as one enantiomer? Does it have any advantage?
Why is it that chiral biological molecules are enantiomerically pure? The other enantiomer would have the same reactivity, and the only difference is their angle of rotation of plane polarized light. ...
- 1,236
2
votes
2
answers
172
views
Are the stereoisomers of nucleosides actually anomers?
An anomer is an epimer at an (hemi)-acetal carbon like $\ce{R2C(OR')2}$.
Why is the 1'-position of a nucleoside referred to as the anomeric center despite the lack of acetal functional groups?
- 884
5
votes
1
answer
2k
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Why does mutarotation occur only in specific media?
I was reading a book on biomolecules, and read that muta-rotation in hexoses, can happen only in media like water, which can act as an acid and as a base. Why is this so?
Essentially, it is just the ...
- 1,339
3
votes
1
answer
2k
views
Is oxytocin's mirror image still oxytocin?
If you were to take the mirror image of oxytocin, does it remain the same or does it change? Say I want a tattoo of it on the left side of my chest, going from the widest part of oxytocin to the ...
- 43
4
votes
1
answer
1k
views
l- versus d-glucose
I recently purchased Dextrose from a local bulkfood store. I want to use it instead of table sugar. My concern is that it may be l-glucose instead of d-glucose. According to Wikipedia l-glucose is too ...
- 43
3
votes
2
answers
5k
views
Are all anomers diastereomers?
I am told that all anomers are diastereomers. I think this is BS. If there is a carbohydrate with only one chiral center, then changing the configuration of the anomeric carbon gives us enantiomers.
...
- 19k