Ricinoleic acid, formally called 12-hydroxy-9-cis-octadecenoic acid is a fatty acid. It is an unsaturated omega-9 fatty acid and a hydroxy acid. It is a major component of the seed oil obtained from mature Castor plant (Ricinus communis L., Euphorbiaceae) seeds or in sclerotium of ergot (Claviceps purpurea Tul., Clavicipitaceae). About 90% of the fatty acid content in castor oil is the triglyceride formed from ricinoleic acid.
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Methyl Ricinoleate has found limited use in perfumery as a solvent for certain types of Oakmoss extract (mainly for Ozrkmoss concrete as an emollient or “plasticizer”) and occasionally as part of the “fatty-floral” notes in Jasmin, Gardenia, Tuberose and other herbaceous oily florals.