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

  • 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]-).

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
How to Cite
Mohamad Nordin, N. A., Adnan, N. F., Hamzah, N., Wan Isahak, W. N. R., Salimon, J., & Yarmo, M. A. (1). Monoestolides Synthesis From Ricinoleic-Oleic Acids Using Silicotungstic Acid Sol-Gel Catalyst. Journal of Science and Technology, 2(2). Retrieved from https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/261
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Articles