Difficulties in isolating and purifying antibiotic fatty acids from culture filtrates of Pseudozyma flocculosa, a biocontrol agent against powdery mildew, have been limiting factors in studying the properties and understanding the mode of action of the biocontrol agent. We report a new protocol for synthesizing (Z)-9-heptadecenoic and for the first time synthesis of (Z)-6-methyl-9-heptadecenoic acids, two antibiotic fatty acids produced by P. flocculosa. This allowed reproducible and quantifiable means of assaying biological activity of the molecules. In these bioassays, both molecules exhibited antifungal activity corresponding to their expected potency. These new developments should facilitate further studies aimed at deciphering the ecological properties of P. flocculosa.

Antibiosis, Biocontrol, Fatty acids, Powdery mildew, Pseudozyma flocculosa
dx.doi.org/10.1023/A:1005464326573
Journal of Chemical Ecology
Department of Chemistry

Avis, T, Boulanger, R.R. (R. R.), & Bélanger, R.R. (R. R.). (2000). Synthesis and biological characterization of (Z)-9-heptadecenoic and (Z)-6-methyl-9-heptadecenoic acids: Fatty acids with antibiotic activity produced by Pseudozyma flocculosa. Journal of Chemical Ecology, 26(4), 987–1000. doi:10.1023/A:1005464326573