Monoestolides Synthesis From Ricinoleic-Oleic Acids Using Silicotungstic Acid Sol-Gel Catalyst

Authors

  • Nor Asikin Mohamad Nordin
  • Nadia Farhana Adnan
  • Noraini Hamzah
  • Wan Nor Roslam Wan Isahak
  • Jumat Salimon
  • Mohd Ambar Yarmo

Keywords:

Monoestolide synthesis, oleic acid, ricinoleic acid, STA sol-gel

Abstract

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 sol-gel for the condensation reaction of a mixture RA and OA have been investigated and compared with unsupported STA and homogeneous perchloric acid. STA sol-gel 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, [M-H]-), 25.69 % selectivity to ricinoleic-linoleic monoestolide acid (m/z 559.47, [M-H]-) and 13.65 % selectivity to ricinoleic-oleic monoestolide (m/z 561.48, [M-H]-).

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Author Biographies

  • Nor Asikin Mohamad Nordin
    Department of Science, UTM SPACE, Universiti Teknologi Malaysia International Campus Jalan Semarak, 54100 Kuala Lumpur
  • Nadia Farhana Adnan
    School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,43600 Bangi, Selangor Darul Ehsan, Malaysia
  • Noraini Hamzah

    School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,43600 Bangi, Selangor Darul Ehsan, Malaysia

    School Of Chemical Sciences and Environment, Faculty of Applied Sciences University of Technology MARA, 40450 Selangor Darul Ehsan, Malaysia

  • Wan Nor Roslam Wan Isahak
    School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,43600 Bangi, Selangor Darul Ehsan, Malaysia
  • Jumat Salimon
    School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,43600 Bangi, Selangor Darul Ehsan, Malaysia
  • Mohd Ambar Yarmo
    School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,43600 Bangi, Selangor Darul Ehsan, Malaysia

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How to Cite

Mohamad Nordin, N. A., Adnan, N. F., Hamzah, N., Wan Isahak, W. N. R., Salimon, J., & Yarmo, M. A. (2010). Monoestolides Synthesis From Ricinoleic-Oleic Acids Using Silicotungstic Acid Sol-Gel Catalyst. Journal of Science and Technology, 2(2). https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/261