Chapter 20, Problem 20.58P

Interpretation Introduction

(a)

Interpretation:

If this monosaccharide is an aldose or a ketose and a hexose or a pentoses should be determined.

Concept introduction:

Carbohydrates and lipids are the energy sources. Carbohydrates are composed of carbon, hydrogen, and oxygen atoms. They are also known as saccharides because of their sweet taste.

They are classified into three categories, monosaccharide, oligosaccharide, and polysaccharides.

Interpretation Introduction

(b)

Interpretation:

The unusual about the monosaccharide should be explained.

Concept Introduction:

L-Fucose is a hexose deoxy sugar having molecular formula ${\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}$. It is the sub-unit of polysaccharide fucoidan where, fucose units are linked together with $\alpha \left(1\to 3\right)$ linkage. Other than all six carbon sugars, it has methyl group on last carbon instead of hydroxyl group. It is a monosaccharide unit common to A, B, AB, and O blood types.

Interpretation Introduction

(c)

Interpretation:

The monosaccharide formed should be identified if the L-fucose undergoes a reaction in which its terminal -CH₃ group was converted to a CH₂ OH group.

Concept introduction:

L-Fucose is a hexose deoxy sugar having molecular formula ${\text{C}}_{\text{6}}{\text{H}}_{\text{12}}{\text{O}}_{\text{6}}$. It is the sub-unit of polysaccharide fucoidan where, fucose units are linked together with $\alpha \left(1\to 3\right)$ linkage. Other than all six carbon sugars, it has methyl group on last carbon instead of hydroxyl group. It is a monosaccharide unit common to A, B, AB, and O blood types.