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Modification of quebrachitol extracted from natural rubber serum (NRS) to l-chiro-inositol for pharmaceutical and nutraceutical applications

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Abstract

Inositols are a class of biologically active compounds which can be used as precursors for the synthesis of a wide range of bioactive products. Lately, there is growing awareness on the importance of developing chiral compounds in the pharmaceutical and nutraceutical industries. This new emphasis on chiral compounds boils down to safety matters, with an aim to select the right enantiomer for desired biological activities. Natural rubber serum (NRS) has the advantage as it possesses a significant percentage of naturally occurring bioactive inositol compounds. For this study, considerable amounts of quebrachitol (2-O-methyl-l-chiro-inositol) were isolated from NRS using membrane separation technology and converted to l-chiro-inositol crystals. Characterisations of the resulting inositol compounds were performed using Fourier transform infrared spectroscopy (FTIR), high-performance liquid chromatography–mass spectrometry (LCMS) and liquid-state nuclear magnetic resonance (NMR) spectroscopy methods. FTIR and NMR results for the l-chiro-inositol compound obtained showed similar spectrums as the commercial control, while LCMS mass spectra was demonstrated to be at m/z 179.03 (M–H) in the negative ionisation mode, confirming the compound to be l-chiro-inositol. Thus, it can be concluded that quebrachitol from NRS obtained via membrane separation technology and its modified inositol derivatives have high potential market value to be used as building blocks for pharmaceutical and nutraceutical applications. Quebrachitol already exists naturally as an enantiomer and chiral compound in the rubber tree, and instead of being treated as a waste product, its usage can actively contribute to tackling environmental pollution from rubber processing effluents.

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Data availability

The data presented in this study are available from the corresponding author upon request.

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Acknowledgements

This research study was supported by the Malaysian Rubber Board (MRB). The authors would like to thank the Director General of the MRB for permission to publish this work. We would like to express our appreciation to fellow MRB colleagues Pn. Aimi Izyana Ismail, Pn. Nurhafizah Jaffar, En. Mohd Mustakiem Mustafar and Pn. Fatin Syahirah Mohd Arif for their assistance in conducting the experiments. We are also grateful to Dr. Devaraj Veerasamy and Mr. Lau Chee Mun (retired MRB research officers) for their guidance pertaining to chemical modification works. Similarly, we wish to thank Research Instruments Sdn Bhd (Waters Analytical Instruments Sdn Bhd) for their support in the LCMS analyses.

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This research was funded by the Malaysian Rubber Board.

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Correspondence to Christine Sue Chen Lee.

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Lee, C.S.C., Singh, M., Teh, CH. et al. Modification of quebrachitol extracted from natural rubber serum (NRS) to l-chiro-inositol for pharmaceutical and nutraceutical applications. J Rubber Res 26, 179–192 (2023). https://doi.org/10.1007/s42464-023-00218-2

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  • DOI: https://doi.org/10.1007/s42464-023-00218-2

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