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New, partially acetylated dihydroxy fatty acids could be identified in the floral oil of Malpighia coccigera (Malpighiaceae): 7-OAc,3-OH 20:0, 7-OAc,3-OH 22:0, 9-OAc,3-OH 22:0, 9-OAc,5-OH 22:0, 3,9-diOAc 22:0, 9-OAc,3-OH 24:0, and 11-OAc,5-OH 24:0. The substitution patterns of all hitherto undescribed dihydroxylated and additionally identified monohydroxylated fatty acids are in agreement with a polyketide analogous biosynthesis. Intermediates may be 3-acetoxy fatty acids (C16, C18, and C20), known from flower secretions of other phylogenetically unrelated plant families. A possible relationship between plant epicuticular wax and floral oil biosynthesis is discussed. It may explain why an independent but convergent development of oil flowers and flower oils in unrelated plant families was possible.

By comparison of the NMR data of the ferribactins from Pseudomonas chlororaphis ATCC 9446 and of P. fluorescens 18.1 with those of their Ga3+-complexes as models for the Fe3+-complexes it will be shown that only two bidentate ligands are provided for complexation, both located in the peptide chain. The two remainig free sites of the octahedral metal ion are probably occupied by solvent molecules.

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