CARBOHYDRATES & CARBOHYDRATES Hydrolysis Flashcards
Maltose and galactose are both positive in Moore’s test, what test can identify one from another?
BARFOED’S TEST
the bond that connects monomer units in carbohydrates
GLYCOSIDIC BOND
What polysaccharide unit in starch that is attracted to iodine creates a positive reaction to starch?
AMYLOSE
Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?
Ketone/Aldehyde
Galactose will form what type of cyclic monosaccharide?
Aldohexose
What type of glycosidic bond is there in sucrose that makes it a nonreducing sugar?
a 1,2
Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of _____?
Free Anomeric Carbon
What is the oxidizing agent in Barfoed’s Test?
Copper Sulfate
Monomer units in amylose is connected via alpha-1,4 glycosidic bond. Why is amylose considered as nonreducing sugar?
Because it’s not a monosaccharide, but rather a polysaccharide and doesn’t have a free anomeric carbon
___ is the type of glycosidic bond that connects monomer units in maltose.
Alpha, 1,4
Glycosidic bond is connected in between what elements?
Oxygen and Carbon
What is the reducing agent in mucic acid test?
HNO3/Nitric Acid
What carbon number does anomeric carbon in Fructose is in the Fischer projection (not cyclic)?
Carbon 2
Sucrose and fructose are both positive in Seliwanoff’s test, what test can identify one from the other?
Barfoed’s Test, Sucrose is disaccharide while fructose is a monosaccharide
According to functional group and number of carbons, classify galactose.
Aldohexose
Moore’s test will only react to reducing sugars that can undergo aldol condensation (caramelization in sugars), this is due to the presence of ____.
Free anomeric Carbon
A ribose will form what type of cyclic monosaccharide?
Aldopentose
What is the purpose of Barfoed’s Test?
Test for monosaccharides
What is the chemical identity of the red precipitate in Barfoed’s Test?
Cu2O/Copper oxide
Glycosidic bond in lactose uses anomeric carbon. Why does lactose still a reducing sugar?
because it’s a disaccharide that have a free anomeric carbon.
What makes fructose a reducing sugar?
It’s a monosaccharide with free anomeric carbon
According to functional group and number of carbons, classify glucose.
aldohexose
Before becoming an anomeric carbon, what is the original functional group of anomeric carbon?
Aldehyde/Ketone
Galactose will form what type of cyclic monosaccharide?
Pyranose
Seliwanoff’s test will only react to sugars with fructose this is due to the presence of ___?
Ketone group/Ketose
What is the oxidizing agent in Moore’s Test
NaOH/Sodium Hydroxide
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
Maltose and galactose are both positive to mucic acid test, what test can identify one from the other?
Barfoed’s Test
What makes lactose a reducing sugar?
Due to the presence of the the free anomeric carbon
According to functional group and number of carbons, classify fructose.
Ketopentose
What polysaccharide unit in starch that is attracted to iodine that creates a positive reaction to starch?
Amylose
Galactose will form what type of cyclic monosaccharide?
Pyranose
