1) The document discusses fatty acid nomenclature, noting that names reflect double bond location and common names are used. 2) It provides examples to illustrate nomenclature conventions like "linoleic" meaning an 18 carbon chain with 2 double bonds on the 6th carbon. 3) The lecture covers classification and structures of saturated and unsaturated fatty acids, including examples like arachidonic and alpha-linolenic acids.

1. Lecture
Dr. Muhammad Asim Shabbir
Associate Professor
National Institute of Food Science and Technology
University of Agriculture Faisalabad

2. FATTY ACID NOMENCLATURE
 Nomenclature reflects location of double bonds
 Also used are common names (e.g: oleic, stearic, palmitic)
 Linoleic is also known as 18:2 n-6
 This means that F.A is 18 carbons in length, has 2 double bonds, the
first of which is on the 6th carbon
 ARACHIDONIC => 20:4 n-6
 Alpha Linolenic acid (ALA) and essential n-3 fatty acid, (18:3∆ 9c,
∆ 12c, ∆ 15c)

3. CLASSIFICATION AND STRUCTURE OF
SATURATED FATTY ACIDS

4. CONT…

5. NAMING FOR UNSATURATED FATTY
ACIDS

6. Cont.…
Alpha Linolenic acid (ALA) and essential n-3 fatty acid, (18:3∆ 9c, ∆ 12c, ∆ 15c)

7. COMMON NAME OF UNSATURATED
FATTY ACIDS

8. Some naturally occurring fatty acids: Structures, Properties and
Nomenclature

9. Acetylenic fatty acids
 A number of different fatty acids have been identified having triple bonds.
 The nomenclature is similar to double bonds , except that the –ane ending of the
parent alkane is replaced with –ynoic acid, diynoic acid, etc.
 Lowercase ‘a’ to represent acetylenic bond
 Example: tariaric (6-octadecynoic acid)

10. Furan fatty acids
 Furan fatty acids are a group of fatty acids that contain a furan ring. To this furan ring, an
unbranched carboxylic acid and, at another position, an alkyl residue are attached. Natural
furan fatty acids are mono- or di-methylated on the furan ring
 The first natural acid of this type (with R1 = R2 = H, m = 6 and n = 7) was found in the
seed oil of Exocarpus cupressiformis
 Example: