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

Mohamad Nordin, Nor Asikin and Adnan, Nadia Farhana and Hamzah, Noraini and Wan Isahak, Wan Nor Roslam and Salimon, Jumat and Yarmo, Mohd. Ambar (2010) Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst. Joumal of Science and Technology, 2 (2). pp. 71-82. ISSN 2229-8460

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Official URL: http://penerbit.uthm.edu.my/ojs/index.php/JST/arti...


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]-).

Item Type:Article
Uncontrolled Keywords:monoestolide synthesis, oleic acid, ricinoleic acid, STA sol-gel
Subjects:Q Science > Q Science (General)
ID Code:38004
Deposited On:14 May 2014 14:36
Last Modified:19 Feb 2017 15:44

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