Chem 3810-001 Name:
Breakout Problem: carbohydrates
1. Fill in the blanks:
Monosaccharide
|
Monosaccharide
|
Disaccharide
|
Fructose
|
Sucrose
|
|
Galactose
|
Glucose
|
|
Glucose
|
Maltose
|
2. Identify D or L for glucose:
3. Circle the anomeric carbons. Identify whether they are alpha or beta.
4. Draw the products alpha-D-fructose
and beta-D-fructose (remember,
right in the Fischer projection translates to down in the Haworth projection if you
arrange your ring so the carbons go clockwise):
5. As mentioned in lecture, sucrose was not a reducing sugar
due to fructose (aka fructofuranose). Is alpha-D-Fructose
(monomer) a reducing or non-reducing sugar? Explain.
6. Draw the structure of the disaccharide O-beta-D-mannose-(1à4)-beta-D-mannose-6-sulfate. Is this a reducing or non-reducing sugar?
carbohydrates KEY
1. Fill in the blanks:
Monosaccharide
|
Monosaccharide
|
Disaccharide
|
Fructose (ketose)
|
Glucose
|
Sucrose
|
Galactose (aldose)
|
Glucose
|
Lactose
|
Glucose
|
Glucose
|
Maltose
|
3. Circle the anomeric carbons. Identify whether they are alpha or beta.
4. Draw the products alpha-D-fructose
and beta-D-fructose (remember,
right in the Fischer projection translates to down in the Haworth projection if you
arrange your ring so the carbons go clockwise):
5. As mentioned in lecture, sucrose was not a reducing sugar
due to fructose (aka fructofuranose). Is alpha-D-Fructose
(monomer) a reducing or non-reducing sugar? Explain.
Fructose by itself is a reducing
sugar because it has a hemiketal anomeric-carbon.
6. Draw the structure of the disaccharide O-beta-D-mannose-(1à4)-beta-D-mannose-6-sulfate. Is this a reducing or non-reducing sugar?
Answer: O-beta-D-mannose-(1à4)-beta-D-mannose-6-sulfate. This is a reducing sugar.
