Abstract
Objective
To synthesize octyl β-d-glucopyranoside (OG) and decyl β-d-glucopyranoside (DG) in three non-aqueous reaction systems, namely organic solvents, ionic liquids and co-solvent mixtures, via reverse hydrolysis reactions catalyzed by the N189F dalcochinase mutant.
Results
The highest yield of OG (67 mol%) was obtained in the reaction containing 0.5 M glucose, 3 unit ml−1 enzyme in 20% (v/v) octanol and 70% (v/v) [BMIm][PF6] at 30 °C. On the other hand, the highest yield of DG (64 mol%) was obtained in the reaction containing 0.5 M glucose, 3 unit ml−1 enzyme in 20% (v/v) decanol, 20% (v/v) acetone and 50% (v/v) [BMIm][PF6] at 30 °C. The identities of OG and DG products were confirmed by HRMS and NMR.
Conclusion
This is the first report of enzymatic synthesis of OG and DG via reverse hydrolysis reactions in ionic liquids and co-solvent mixtures. The N189F dalcochinase mutant and the non-aqueous reaction systems described here show great potential for future commercial production of long-chain alkyl glucosides.
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Acknowledgements
This work was financially supported by the Thailand Research Fund and the Commission on Higher Education [RMU5480004]; and the Higher Education Research Promotion and National Research University Project of Thailand. P.T. is a recipient of the Royal Golden Jubilee Ph.D. scholarship from the Thailand Research Fund.
Supporting information
Supplementary Fig. 1—Production of OG (a) and DG (b) via reverse hydrolysis reactions in various percentage ratios of alcochol:organic solvent.
Supplementary Fig. 2—Production of OG (a) and DG (b) via reverse hydrolysis reactions in various percentage ratios of alcohol:acetone.
Supplementary Fig. 3—Production of OG (a) and DG (b) via reverse hydrolysis reactions in various percentage ratios of alcohol:[BMIm][PF6].
Supplementary Fig. 4—Production of OG (a) and DG (b) via reverse hydrolysis reactions in various percentage ratios of alcohol:acetone:[BMIm][PF6].
Supplementary Fig. 5—The 1H-NMR spectra of OG (a) and DG (b), and the 1H-1H COSY spectra of OG (c) and DG (d) using CD3OD as solvent.
Supplementary Table 1—Production of OG and DG via reverse hydrolysis reactions in various percentage ratios of alcohol:[BMIm][PF6].
Supplementary Table 2—Production of OG and DG via reverse hydrolysis reactions in various percentage ratios of alcohol:acetone:[BMIm][PF6 ].
Supplementary Table 3—Mass determination of OG and DG by HRMS
Supplementary Table 4—Synthesis of OG by β-glucosidases via reverse hydrolysis reactions in organic solvent systems.
Supplementary Table 5—Synthesis of alkyl and arylalkyl glycosides by β-glycosidases via reverse hydrolysis reactions in ionic liquids systems.
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Thenchartanan, P., Wattana-Amorn, P., Svasti, J. et al. Improved synthesis of long-chain alkyl glucosides catalyzed by an engineered β-glucosidase in organic solvents and ionic liquids. Biotechnol Lett 42, 2379–2387 (2020). https://doi.org/10.1007/s10529-020-02960-8
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DOI: https://doi.org/10.1007/s10529-020-02960-8