Abstract
Cost-effective pretreatments are essential to overcome the recalcitrant properties of lignocellulosic biomass in order to reutilize cellulosic components within the biomass for value-added products. In this study, a sequential pretreatment of low concentration (< 1.00 vol%) alkaline hydrogen peroxide (AHP) at ambient temperature (~ 25 °C) and pressure (1 atm.) with Type III deep eutectic solvent (DES) was used to fractionate oil palm fronds (OPF). A combination of AHP (0.25 vol%, 90 min) and DES (120 °C, 4 h) at the later stage resulted in a pretreated OPF with a delignification of 18.99%, remarkably improved DES-alone delignification extent by 1.6 folds. The characterizations of pretreated OPF confirmed that mild conditions AHP + DES pretreatment could synergically improve the delignification efficiency. Thus, the use of this sequential pretreatment enabled the lignin extraction and effectively disrupted the recalcitrant structure of OPF, yielding a potential feedstock for a biorefinery process at the later stage.





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Acknowledgments
The funding of this research is supported by Ministry of Higher Education, Malaysia under Fundamental-Malaysia’s Research Star Award [FRGS-MRSA/1/2018/WAB01/MUSM/02/1]. In addition, the authors would like to thank Monash University Malaysia for providing M.C. Ho with a Master scholarship.
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Ho, M.C., Wu, T.Y., Chee, S.W.Q. et al. An application of low concentration alkaline hydrogen peroxide at non-severe pretreatment conditions together with deep eutectic solvent to improve delignification of oil palm fronds. Cellulose 26, 8557–8573 (2019). https://doi.org/10.1007/s10570-019-02646-z
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DOI: https://doi.org/10.1007/s10570-019-02646-z


