O

Triacylglycerol

Figure 1 Stereochemical numbering of lipids derived from glycerol. R1, R2, and R3 refer to sn nomenclature.

Table 1 Fatty acids important in nutrition

Symbola

Systematic nameb

Common name

Melting point ( °C) Sources

Saturated fatty acids (SFAs)

n-Ethanoic n-Propanoic n-Butanoic n-Hexanoic n-Octanoic n-Decanoic n-Dodecanoic n-Tetradecanoic n-Hexadecanoic n-Octadecanoic n-Eicosanoic n-Docosanoic n-Tetracosanoic

Monounsaturated (monoenoic) fatty acids

10:1 n-1 cis-9-Decenoic

12:1 n-3 cis-9-Dodecenoic

14:1 n-5 cis-9-Tetradecenoic

16:1 n-7t trans-Hexadecenoic

16:1 n-7 cis-9-Hexadecenoic

18:1 n-9 cis-9-Octadecenoic

18:1 n-9t trans-9-Octadecenoic

18:1 n-7t trans-11-Octadecenoic

20:1 n-11 cis-9-Eicosaenoic

20:1 n-9 cis-11-Eicosaenoic

22:1 n-9 cis-13-Docosaenoic

Polyunsaturated (polyenoic) fatty acids

Dienoic

18:2 n-9 cis,cis-6,9-Octadecadienoic

18:2 n-6 cis,cis-9,12-Octadecadienoic

Trienoic 18:3 n-6 18:3 n-3 20:3 n-6 Tetra; penta; hexaenoic 20:4 n-6 20:5 n-3 22:4 n-6 22:5 n-6 22:6 n-3

All-cis-6,9,12-octadecatrienoic All-cis-9,12,15-octadecatrienoic All-cis-8,11,14-eicosatrienoic

All-cis-8,11,14-eicosatetraenoic All-cis-5,8,11,14,17-eicosapentaenoic All-cis-7,10,13,16-docosatetraenoic All-c/s-7,10,13,16,19-docosapentaenoic All-c/s-4,7,10,13,16,19-docosahexaenoic

Acetic 16.7

Propanoic -22.0

Caprylic 12.7

Capric 29.6

Lauric 42.2

Myristic 52.1

Palmitic 60.7

Stearic 69.6

Arachidic 75.4

Behenic 80.0

Lignoceric 84.2

Caproleic Lauroleic Myristoleic Palmitelaidic

Palmitoleic 1

Oleic 16

Elaidic 44

trans Vaccenic 44 Gadoleic

Gondoic 24

Erucic 24

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