The structures of triacylglycerols from sclerotia of the rye ergot Claviceps purpurea (Fries) Tul.

The triacylglycerol fraction of lipids extracted from sclerotia of the rye ergot Claviceps purpurea strain VKM F-2642D has been shown to comprise about 60% of the total lipids and to consist of at least seven constituents, namely, [R]-[R]-[R] (1.6% of the total fraction), [R-Ric]-[R]-[R] (27%), [R-Ric]-[R-Ric]-[R] (65%), [R-Ric]-[R-Ric]-[R-Ric] (4.8%), [R-Ric-Ric]-[R-Ric]-[R-Ric] (1.1%), [R-Ric-Ric]-[R-Ric-Ric]-[R-Ric] (0.3%), and [R-Ric-Ric-Ric]-[R-Ric-Ric]-[R-Ric-Ric] (0.2%) (acyl residues at the 1(3), 2 and 3(1) positions of the glycerol moiety are indicated; R = nonhydroxylated fatty acid (C16, C18) residue, Ric = ricinoleyl residue). Non-hydroxylated fatty acyls (R) are n-16:0 (25-50% of the total), 16:1 omega 7 (10-15%), n-18:0 (2-5%), 18:1 omega 9 (20-30%), and 18:2 omega 6,9 (10-35%). The second and the third of the listed triacylglycerols are composed dominantly (by 86% or more) of 1,2-di-[R]-3-[R-Ric]-sn-glycerol and 1-[R]-2,3-di-[R-Ric]-sn-glycerol, respectively.