Oc-linolenic acids

BIOSYNTHETIC PATHWAY OF Oc-LINOLENIC ACID IN OLIVE PLANT LEAVES... 

The moss Ceratodon purpureas (Hedw.) Brid. contains large amounts of the acetylenic fatty acids 9,12-octadecadien-6-ynoic acid [18 2A] and 6,9,12-octadecatrien-6-ynoic acid [18 3A], which are in close structural relationship to the common fatty acids lino-leic acid [18 2(n-6)] and oc-linolenic acid [18 3(n-3)], and which are obviously restricted to the triacylglycerol fraction [2]. 

Figure 25.7. Ion trap mass spectrum of ESI-MS3 of [RLnR + Li - RCOOH]+ at m/z 623.5. For abbreviations, see Figures 25.2 and 25.3. Ln/CH=CHCOOH is oc,p-unsaturated linolenic acid from the sn-2 position. Both Ln and LnCOOH are linolenic acid. RLnR here is diricinoleoy-linolenoyl-glycerol (non-stereospecific) from castor oil included RRLn and LnRR if any.

Linolenic acid [ct-linolenic acid, (a/f-Z)-9,12,lS-oc-tadecatrienoic acid]. 

Three different fatty acids can occur from 27 different mixed triglycerides. To simplify the description, one- or two-letter abbreviations of fatty acids are used, such as B = butanoic (butyric), D = decanoic (capric or caprinic), H = hexanoic (caproic), L = linoleic, La = lauric, Ln = linolenic, M = myristic, O = oleic, Oc = octanoic (caprylic), P = palmitic, Po = palmitoleic, S = saturated, St = stearic, U = unsaturated and V = vaccenic. For example, the mixed triacylglycerol esterified with palmitic acid in position s -l, with stearic acid in the position sn-2 and oleic acid in the position sn-3 of glycerol is then called l-palmitoyl-2-stearoyl-3-oleoyl-s -glycerol (abbreviated to s -PStO). Racemate is a mixture of s -PStO and and s -OStP in a molar ratio of 1 1... 

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