Topic

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: