General, Organic, and Biological Chemistry: Structures of Life (5th Edition)
General, Organic, and Biological Chemistry: Structures of Life (5th Edition)
5th Edition
ISBN: 9780321967466
Author: Karen C. Timberlake
Publisher: PEARSON
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Chapter 15, Problem 15.45UTC
Interpretation Introduction

Interpretation: The following question can be explained by the classification of carbohydrates.

Concept introduction: Carbohydrates are simple derivatives of polyhydroxy aldehydes, alcohols, ketones, acids, and their polymers having acetal type linkage. They may be categorized as monosaccharides, disaccharides and polysaccharides. Monosaccharides contain an aldehyde or a ketone group and it only contains 1 unit. Disaccharides contain an aldehyde or a ketone group and it only contains2 units of monosaccharides linked together with a glycosidic bond. Polysaccharides contain more than 1 unit of monosaccharide linked together with a glycosidic bond.

Given: Here we are given the Haworth structure of Isomaltose which we get from thebreakdown of starch and we are asked to find out the whether it is mono-, di-, or polysaccharide. We are also asked to find the monosaccharides and glycosidic link in isomaltose. Also, we need to find α or β-anomer of isomaltose, and whether it is a reducing sugar.

General, Organic, and Biological Chemistry: Structures of Life (5th Edition), Chapter 15, Problem 15.45UTC , additional homework tip  1

Expert Solution & Answer
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Answer to Problem 15.45UTC

Solution: (a) It is a disaccharide.

(b) The monosaccharides of Isomaltase are 2 molecules of α-glucose.

(c) The glycosidic link in Isomaltase is α-1,6-glycosidic bond.

(d) The given isomer is α-isomer.

Explanation of Solution

(a) In the given structure, there are 2 units of monosaccahrides. Thus, it is a disaccharide.

(b) If the molecule of Isomaltase is broken, then there is formation of 2 monosaccharide units of α-glucose molecules.

General, Organic, and Biological Chemistry: Structures of Life (5th Edition), Chapter 15, Problem 15.45UTC , additional homework tip  2

Isomaltase  2 αglucose

(c) The glycosidic bond in Isomaltase is formed between the C1 carbon of the 1st glucose molecule and the C6 carbon of the 2nd glucose. Thus the glycosidic link in Isomaltase is α-1, 6-glycosidic bond.

(d) When the hydroxyl group on C1 carbon atom is facing in downwards direction, then the isomer is called the α-isomer and when the hydroxyl group on C1 carbon atom is facing in upwards direction, then the isomer is called the β-isomer.

Here, the hydroxyl group on C1 carbon atom is facing in downwards direction, thus the given isomer is α-isomer.

Conclusion

Carbohydrates play important roles in the immune system, fertilization, blood clotting, overall development and preventing pathogenesis.

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General, Organic, and Biological Chemistry: Structures of Life (5th Edition)

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