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Taguchi orthogonal design assisted immobilization of Candida rugosa lipase onto nanocellulose-silica reinforced polyethersulfone membrane: physicochemical characterization and operational stability

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Abstract

A greener processing route to replace the current environmentally-unfriendly esterification technique to produce biofuels such as pentyl valerate (PeVa) was explored. This study statistically optimized the covalent immobilization of Candida rugosa lipase (CRL) onto biomass-based nanocellulose-silica (NC-SiO2) reinforced polyethersulfone (PES) membrane to synthesize PeVa. Raman spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and atomic force microscopy of NC-SiO2-PES/CRL proved that CRL was successfully conjugated to the membrane. The optimized Taguchi Design-assisted immobilization of CRL onto NC-SiO2-PES membrane (5% glutaraldehyde, 4 h of immobilization, 20 mg/mL CRL concentration, 40 °C and pH 5) gave 90% yield of PeVa in 3 h. The thermal stability of NC-SiO2-PES/CRL was ~ 30% greater over the free CRL, with reusability for up to 14 successive esterification cycles. In a nutshell, the greener NC-SiO2-PES membrane effectively hyperactivated and stabilized the CRL for the esterification production of PeVa. This research provides a promising approach for expanding the use of sustainably sourced NC and SiO2 nanoparticles, as fillers in a PES for improving CRL activity and durability for an extended catalytic process.

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Acknowledgments

The authors would like to express their gratitude to the Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia for their facilities. This work was funded by Yayasan Sultan Iskandar, Johor and the Fundamental Research Grant Scheme (FRGS) (R.J130000.7854.5F013) awarded by Universiti Teknologi Malaysia, Johor.

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Conceptualization: RAW. Methodology: NE. Formal analysis and investigation: NE. Writing—original draft preparation: NE. Writing—review and editing: RAW, LWJ, NAM, SC and JJ. Funding acquisition: RAW. Resources: RAW and LWJ. Supervision: RAW.

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Correspondence to Roswanira Abdul Wahab.

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Elias, N., Wahab, R.A., Jye, L.W. et al. Taguchi orthogonal design assisted immobilization of Candida rugosa lipase onto nanocellulose-silica reinforced polyethersulfone membrane: physicochemical characterization and operational stability. Cellulose 28, 5669–5691 (2021). https://doi.org/10.1007/s10570-021-03886-8

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  • DOI: https://doi.org/10.1007/s10570-021-03886-8

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