CARBOHYDRATES & CARBOHYDRATES Hydrolysis Flashcards

1
Q

Maltose and galactose are both positive in Moore’s test, what test can identify one from another?

A

BARFOED’S TEST

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

the bond that connects monomer units in carbohydrates

A

GLYCOSIDIC BOND

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What polysaccharide unit in starch that is attracted to iodine creates a positive reaction to starch?

A

AMYLOSE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?

A

Ketone/Aldehyde

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Galactose will form what type of cyclic monosaccharide?

A

Aldohexose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What type of glycosidic bond is there in sucrose that makes it a nonreducing sugar?

A

a 1,2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of _____?

A

Free Anomeric Carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the oxidizing agent in Barfoed’s Test?

A

Copper Sulfate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Monomer units in amylose is connected via alpha-1,4 glycosidic bond. Why is amylose considered as nonreducing sugar?

A

Because it’s not a monosaccharide, but rather a polysaccharide and doesn’t have a free anomeric carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

___ is the type of glycosidic bond that connects monomer units in maltose.

A

Alpha, 1,4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Glycosidic bond is connected in between what elements?

A

Oxygen and Carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the reducing agent in mucic acid test?

A

HNO3/Nitric Acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What carbon number does anomeric carbon in Fructose is in the Fischer projection (not cyclic)?

A

Carbon 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Sucrose and fructose are both positive in Seliwanoff’s test, what test can identify one from the other?

A

Barfoed’s Test, Sucrose is disaccharide while fructose is a monosaccharide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

According to functional group and number of carbons, classify galactose.

A

Aldohexose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of ____.

A

Free anomeric Carbon

17
Q

A ribose will form what type of cyclic monosaccharide?

A

Aldopentose

18
Q

What is the purpose of Barfoed’s Test?

A

Test for monosaccharides

19
Q

What is the chemical identity of the red precipitate in Barfoed’s Test?

A

Cu2O/Copper oxide

20
Q

Glycosidic bond in lactose uses anomeric carbon. Why does lactose still a reducing sugar?

A

because it’s a disaccharide that have a free anomeric carbon.

21
Q

What makes fructose a reducing sugar?

A

It’s a monosaccharide with free anomeric carbon

22
Q

According to functional group and number of carbons, classify glucose.

A

aldohexose

23
Q

Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?

A

Aldehyde/Ketone

24
Q

Galactose will form what type of cyclic monosaccharide?

25
Seliwanoff’s test will only react to sugars with fructose this is due to the presence of ___?
Ketone group/Ketose
26
What is the oxidizing agent in Moore's Test
NaOH/Sodium Hydroxide
27
Monomer units in sucrose is connected via alpha1-2 glycosidic bond. Why is sucrose considered as nonreducing sugar?
It's a disaccharide without a free anomeric carbon
28
Maltose and galactose are both positive to mucic acid test, what test can identify one from the other?
Barfoed's Test
29
What makes lactose a reducing sugar?
Due to the presence of the the free anomeric carbon
30
According to functional group and number of carbons, classify fructose.
Ketopentose
31
What polysaccharide unit in starch that is attracted to iodine that creates a positive reaction to starch?
Amylose
32
Galactose will form what type of cyclic monosaccharide?
Pyranose