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Improvement of radio frequency (RF) heating-assisted alkaline pretreatment on four categories of lignocellulosic biomass

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Abstract

Pretreatment plays an important role in making the cellulose accessible for enzyme hydrolysis and subsequent conversion because it destroys more or less resistance and recalcitrance of biomass. Radio frequency (RF)-assisted dielectric heating was utilized in the alkaline pretreatment on agricultural residues (corn stover), herbaceous crops (switchgrass), hardwood (sweetgum) and softwood (loblolly pine). Pretreatment was performed at 90 °C with either RF or traditional water bath (WB) heating for 1 h after overnight soaking in NaOH solution (0.2 g NaOH/g Biomass). Pretreated materials were characterized by chemical compositional analysis, enzyme hydrolysis, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The glucan yields of RF-heated four categories of hydrolysates were 89.6, 72.6, 21.7, and 9.9 %. Interestingly, RF heating raised glucan yield on switchgrass and sweetgum but not on corn stover or loblolly pine. The SEM images and FTIR spectra agreed with results of composition analysis and hydrolysis. GC–MS detected some compounds only from RF-heated switchgrass. These compounds were found by other researchers only in high-temperature (150–600 °C) and high-pressure pyrolysis processes.

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Authors and Affiliations

  1. Department of Biosystems Engineering, Auburn University, 200 Tom E. Corley Building, Auburn, AL, 36849-5417, USA

    Xiaofei Wang, Steven Taylor & Yifen Wang

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  1. Xiaofei Wang
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  2. Steven Taylor
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  3. Yifen Wang
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Correspondence to Yifen Wang.

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Wang, X., Taylor, S. & Wang, Y. Improvement of radio frequency (RF) heating-assisted alkaline pretreatment on four categories of lignocellulosic biomass. Bioprocess Biosyst Eng 39, 1539–1551 (2016). https://doi.org/10.1007/s00449-016-1629-2

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  • DOI: https://doi.org/10.1007/s00449-016-1629-2

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