All Questions
Tagged with biochemistry carbohydrates
47
questions
6
votes
2
answers
161
views
What does ‘D’ in GADP (glyceraldehyde 3-phosphate) stand for?
Wikipedia says glyceraldehyde-3-phosphate can be abbreviated as G3P, GA3P, GADP, GAP, TP, GALP or PGAL, and many resources seem to use GADP as its abbreviation.
I have no idea where ‘D’ came from. ...
- 26.3k
0
votes
0
answers
27
views
Why can't the fructose monomer in sucrose be α-fructose?
In all academic sources, sucrose is identified as α−glucose (1-->2) β−fructose. However, I cannot find any explanation anywhere as to why the fructose monomer has to be in the β configuration. ...
- 11
6
votes
4
answers
4k
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Why is fermentation of cellulose to produce biofuel and nutrients so difficult?
The formula for glucose is $\ce{C6H12O6}$ and that of cellulose is very similar $\ce{C6H10O5}$. Glucose can be readily fermented by yeast and other micro-organisms to produce carbon dioxide and ...
0
votes
0
answers
24
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Bioplastic from starch
I am doing research in bioplastic from starch. I have tried many quantities and concentrations of starch, vinegar and glycerol at different temperatures. But I am unable to get a certain result of the ...
Maneeha. Ajmal
29
votes
2
answers
82k
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Why does fructose reduce Tollen's reagent and Fehling's solution?
Even though fructose is a ketohexose (ketone-containing hexose, a six-carbon monosaccharide), it reduces Tollen's reagent and Fehling's solution. Generally, a ketone does not reduces Tollen's reagent ...
0
votes
0
answers
263
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Why does glucose react with hydroxyl amine and HCN but doesn't give Schiff's test or react with NaHSO3?
I can't understand this because if there isn't a free CHO group then it also shouldn't react with NH2OH and HCN.
On the same note can anyone also explain why pentaacetate of glucose not react with ...
- 19
-1
votes
2
answers
2k
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Are Starch, Amylose and, Amylopectin reducing sugars?
Amylose and Amylopectin;
As per the information I've learnt, Amylose is considered a reducing sugar but Amylopectin is not because Amylose has a free "reducing end" which Amylopectin lacks, ...
- 41.2k
8
votes
1
answer
2k
views
Does cooling a potato change the nature of its carbohydrates?
A talk-show guest of Joe Rogan claimed that cooling a potato after cooking creates "resistant starch" that's better for human consumption
https://www.youtube.com/watch?v=niwqfwA2Lb8
The ...
- 519
10
votes
2
answers
5k
views
Is formaldehyde a carbohydrate?
Formaldehyde has the formula $\ce{CH2O}$, and the ratio of atoms in a simple carb is $\ce{1C:2H:1O}$. This fits the formula of carbohydrates. When I researched this, I found some sources saying that ...
- 44.3k
1
vote
2
answers
286
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How does industry separate glucose from fructose using liquid chromatography when producing high-fructose corn syrup?
Can someone explain how the separation of glucose and fructose is achieved using liquid chromatography in the industrial production of high-fructose corn syrup?
I've seen references to ion-exchange ...
- 121
3
votes
1
answer
228
views
Production of ʟ-glucose
What chain(s) of reactions are used to produce ʟ-glucose? I did a search on Google Scholar, but to my surprise nothing came up. My guess would be that the synthesis starts from ᴅ-glucose for which ...
- 41.2k
2
votes
0
answers
212
views
Do enzymes that digest ᴅ-glucose react with ʟ-glucose?
ᴅ-Glucose is common in nature and ʟ-glucose is synthesized in the lab.
I know that humans can't use ʟ-glucose in their aerobic pathways because it doesn't match the active site of the enzyme, but why ...
- 38.4k
0
votes
1
answer
410
views
Does changes in pH affects cyclic form of glucose in water solution?
Glucose in water solution is mainly in cyclic form. Both base and acid can catalize formation of hemiacetal, but in distinct mechanisms. I found information that monosacharides eg. glucose exist ...
5
votes
2
answers
3k
views
How does existence of alpha and beta form of glucose prove that it exists as a cyclic structure
My book says that
Glucose is found to exist in two different crystalline forms which are
named as $\alpha$ and $\beta$.
Next it says that
This behaviour could not be explained by the open ...
- 30.4k
14
votes
1
answer
61k
views
How do you identify reducing / non-reducing sugar by looking at structure?
Identifying reducing / non-reducing sugar been confusing me for a while now , I know that reducing sugar contain aldehyde or ketone group . It's easy to identify them in monosaccharides but this ...
- 1