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Chapter 28: Question 28.29 (page 1135)

Draw the α anomer of maltose. What products are formed on hydrolysis of this form of maltose?

Short Answer

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Answer

Hydrolysis of α-anomer of maltose

Step by step solution

01

Maltose

The carbohydrate maltose is a disaccharide obtained from starch. It is present in barley. It consists of two glucose units joined by 1→4α a glycoside bond.

02

Anomers

The diastereomers that differ in the configuration at the first carbon are anomers.

Maltose exists in two forms, and they differ in the configuration of the first carbon. That is αanomer and β anomer, and both differ in the configuration at the first carbon.

03

Hydrolysis products of  -anomer of maltose

The hydrolysis of maltose produces two anomeric forms of glucose. They are αD-glucose and βD-glucose. The structures and the reaction are as shown:

Hydrolysis of α-anomer of maltose

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Most popular questions from this chapter

Draw a Fischer projection of the monosaccharide from which each of the following glycosides was prepared.

Convert each Haworth projection in Problem 28.14 to a three-dimensional representation using a chair pyranose ring.

(a)Label all the O atoms that are part of a glycoside in rebaudioside A. Rebaudioside A, marketed under the trade name Truvia, is a sweet glycoside obtained from the stevia plant, which has been used for centuries in Paraguay to sweeten foods. (b)The alcohol or phenol formed from the hydrolysis of glycoside is called an aglycon. What aglycon and monosaccharides are formed by the hydrolysis of rebaudioside A?

Convert each ball-and-stick model to a Fischer projection.

(a.)

(b.)

Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine, soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence.

a. Label all glycoside bonds.

c. What products are formed when stachyose is hydrolyzed with H3O+?

d. Is stachyose a reducing sugar?

e. What product is formed when stachyose is treated with excess CH3I, Ag2O?

f. What products are formed when the product in (e) is treated with H3O+?
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