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Starch Hydrolysis and Sugar Preparation

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Questions and Answers

How is glucose prepared from inulin?

By the action of alkali (NaOH)

By the action of autoclave at 150o

By acid hydrolysis (correct)

By the action of specific enzyme

What is the method used to prepare fructose from sucrose?

Alkalinize the juice of sugar cane with Ca(OH)2

Ca(OH)2 solution

Ca fructosate ppt

Acid or Enzyme Hydrolysis (correct)

Which process is involved in the preparation of raw sugar from sugar-cane juice?

Autoclave at 150o

Alkali rearrangement

Acid hydrolysis

Crystallization with charcoal (correct)

How is lactose obtained for preparation?

From whey after concentration Signup and view all the answers

What is the primary purpose of alkalinizing the juice of sugar cane?

To neutralize plant acids and avoid hydrolysis Signup and view all the answers

How is starch prepared from Graminaceous fruits?

Through glutin removal with alkali Signup and view all the answers

What is the purpose of the partial acid hydrolysis step in the preparation of glucose?

To convert starch into glucose Signup and view all the answers

Which of the following is a key step in the preparation of fructose from sucrose?

Alkaline treatment of sucrose with Ca(OH)2 Signup and view all the answers

What is the purpose of heating the sugar cane juice with Ca(OH)2 during sucrose preparation?

To neutralize plant acids and avoid hydrolysis of sucrose Signup and view all the answers

What is the role of charcoal in the refining of raw sugar?

To remove impurities and decolorize the sugar Signup and view all the answers

How is lactulose, a semisynthetic sugar, prepared?

By alkaline rearrangement of lactose Signup and view all the answers

What is the purpose of the alkali addition step in the preparation of starch from Graminaceous fruits?

To remove the gluten (protein) from the mixture Signup and view all the answers

What is the primary purpose of concentrating the whey during the preparation of lactose?

To increase the yield of lactose crystals Signup and view all the answers

What is the main difference between the preparation of fructose from glucose versus from sucrose?

The use of alkali versus acid hydrolysis Signup and view all the answers