carbohydrate analsis

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created 3 years ago by chemistsquirrel
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1

what does the Molisch reagent test for?

carbohydrate

2

In the resorcinol reagent test, a deep red color indicates a positive test for _________.

KetoHexose

3

What does Benedicts reagent test for?

reducing sugar

4

What does Iodine-KI reagent test for?

Amylose/starch

5

What phenomenon indicates the positive result of Benedict's reagent?

Greenish or red color

6

What phenomenon indicates the positive result of Molisch reagent?

red-violet layer

7

What phenomenon indicates the positive result of Iodine-KI reagent?

Vivid blue color

8

What are we hydrolyzing the sucrose solution with?

6 M HCl

9

Which of the following disaccharide is non reducing?

sucrose and trehalose

10

galactose is reducing because its aldehyde group is easily oxidized to the carboxylic acid.

true

11

Recorcinol test results:

Deep red color indicate ketohexose.

green color indicate pentoses

sucroses give a positive ketohexose test becasue of partial hydrolysis to subunits, but not as intense as a ketohexose.

12

what do each test for?

  • Molisch test
  • resorcinol test
  • benedicts's test
  • iodine-k test
  • sugar
  • ketohexose or pentose
  • reducing/non-reducing
  • amylose or starch