Bioconversion of methyl ricinoleate to 4-hydroxy-decanoic acid and to γ-decalactone by yeasts of the genus Candida

The capacity of several strains of yeasts to do the bioconversion of the methyl ricinoleate into γ‐decalactone, was studied in a medium containing this methylic ester of fatty acid as sole carbon source. Amongst the strains which are able to do this bioconversion, two types of behaviour are observed: some of the strains produce γ‐decalactone during all the incubation in bioconversion medium while others produce this aroma compound very quickly and then consume it fast too. The tested strains produce at the same time γ‐decalactone and the corresponding acid form (4‐hydroxy‐decanoic acid), and this, in variable proportions.