Chapter 19.4, Problem 19.8P

Interpretation Introduction

(a)

Interpretation:

The structure of triacylglycerol that is formed of three 12-carbon fatty acid needs to be determined.

Concept Introduction:

Lipids are biomolecules which are involved in different biochemical reactions. They are special types of organic molecules which can only identify with the help of their physical properties, not by the presence of any certain functional group. In general, lipids contain a large number of C-C and C-H bonds with few polar functional groups such as $\text{–OH, -SH}$ , etc.

Triacylglycerols are most abundant lipids which are mainly found in animal fat and vegetable oils. They are triesters of glycerol, therefore in the formation of one molecule of triacylglycerol, three molecules of fatty acids react with one molecule of glycerol as given below;

  ${\text{CH}}_{\text{2}}{\text{(OH)CH(OH)CH}}_{\text{2}}\text{(OH) + 3 R- COOH}\stackrel{}{\to }{\text{CH}}_{\text{2}}{\text{(OCOR)CH(OCOR)CH}}_{\text{2}}{\text{(OCOR) + 3 H}}_{\text{2}}\text{O}$

Interpretation Introduction

(b)

Interpretation:

The structure of triacylglycerol that is formed by a fatty acid with three cis-double bonds needs to be determined.

Concept Introduction:

Lipids are biomolecules which are involved in different biochemical reactions.They are special types of organic molecules which can only identify with the help of their physical properties, not by the presence of any certain functional group. In general, lipids contain a large number of C-C and C-H bonds with few polar functional groups such as $\text{–OH, -SH}$ , etc.

Triacylglycerols are most abundant lipids which are mainly found in animal fat and vegetable oils. They are triesters of glycerol, therefore in the formation of one molecule of triacylglycerol, three molecules of fatty acids react with one molecule of glycerol as given below;

  ${\text{CH}}_{\text{2}}{\text{(OH)CH(OH)CH}}_{\text{2}}\text{(OH) + 3 R- COOH}\stackrel{}{\to }{\text{CH}}_{\text{2}}{\text{(OCOR)CH(OCOR)CH}}_{\text{2}}{\text{(OCOR) + 3 H}}_{\text{2}}\text{O}$

Interpretation Introduction

(c)

Interpretation:

The structure of triacylglycerol that is formed by a fatty acid with trans-double bonds needs to be determined.

Concept Introduction:

Lipids are biomolecules which are involved in different biochemical reactions. They are special types of organic molecules which can only identify with the help of their physical properties, not by the presence of any certain functional group. In general, lipids contain a large number of C-C and C-H bonds with few polar functional groups such as $\text{–OH, -SH}$ , etc.

Triacylglycerols are most abundant lipids which are mainly found in animal fat and vegetable oils. They are triesters of glycerol, therefore in the formation of one molecule of triacylglycerol, three molecules of fatty acids react with one molecule of glycerol as given below;

  ${\text{CH}}_{\text{2}}{\text{(OH)CH(OH)CH}}_{\text{2}}\text{(OH) + 3 R- COOH}\stackrel{}{\to }{\text{CH}}_{\text{2}}{\text{(OCOR)CH(OCOR)CH}}_{\text{2}}{\text{(OCOR) + 3 H}}_{\text{2}}\text{O}$