Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst

• Main Authors: Mohamad Nordin, Nor Asikin, Adnan, Nadia Farhana, Hamzah, Noraini, Wan Isahak, Wan Nor Roslam, Salimon, Jumat, Yarmo, Mohd. Ambar
• Format: Article
• Language: English
• Published: Penerbit UTHM 2010
• Subjects: Q Science (General)
• Online Access: http://eprints.utm.my/id/eprint/38004/2/140; http://eprints.utm.my/id/eprint/38004/; http://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/261/140

Sol-gel silica-supported hydrated silicotungstic acid (STA sol-gel), prepared by incorporating hydrated silicotungstic acid (STA) into silica via sol-gel technique, was used as an efficient heterogeneous catalyst for condensation reaction of a mixture ricinoleic acid (RA) and oleic acid (OA). The activity and selectivity of STA solgel for the condensation reaction of a mixture RA and OA have been investigated and compared with unsupported STA and homogeneous perchloric acid. STA solgel and bulk STA catalysts surface were characterized using X-ray Photoelectron Spectroscopy (XPS) analysis. The reactions were carried out under vacuum (2 mBar) for 10 hours at 70 0C under solvent-less conditions. The Liquid Chromatography-Mass Spectrometry (LC-MS) of reaction products results showed chromatographic peaks for the presence of three new monoestolides at retention times (tR) 9.2 min (m/z 577.48, as [M-H]-), 11.2 min (m/z 559.46, [M-H]-) and 12.6 min (m/z 561.48, [M-H]-). STA sol-gel catalyst is new promising heterogenous catalyst that can be used for producing estolide compounds from a mixture of RA and OA. STA sol-gel gave 100 % conversion with 60.62 % selectivity to ricinoleic-ricinoleic monoestolide acid (m/z 577.48, [MH]-), 25.69 % selectivity to ricinoleic-linoleic monoestolide acid (m/z 559.47, [MH]-) and 13.65 % selectivity to ricinoleic-oleic monoestolide (m/z 561.48, [M-H]-).