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Effect of varying feedstock–pretreatment chemistry combinations on the formation and accumulation of potentially inhibitory degradation products in biomass hydrolysates

Authors

  • Bowen Du,

    1. Department of Environmental Science, Baylor University, Waco, Texas
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  • Lekh N. Sharma,

    1. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas
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  • Christopher Becker,

    1. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas
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  • Shou-Feng Chen,

    1. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas
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  • Richard A. Mowery,

    1. Department of Chemical and Biological Engineering, Forest Bioproducts Research Institute, University of Maine, 5737 Jenness Hall Rm. 311, Orono, Maine 04469; telephone: 207-581-2226; fax: 207-581-2323
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  • G. Peter van Walsum,

    Corresponding author
    1. Department of Chemical and Biological Engineering, Forest Bioproducts Research Institute, University of Maine, 5737 Jenness Hall Rm. 311, Orono, Maine 04469; telephone: 207-581-2226; fax: 207-581-2323
    • Department of Chemical and Biological Engineering, Forest Bioproducts Research Institute, University of Maine, 5737 Jenness Hall Rm. 311, Orono, Maine 04469; telephone: 207-581-2226; fax: 207-581-2323.
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  • C. Kevin Chambliss

    1. Department of Environmental Science, Baylor University, Waco, Texas
    2. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas
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Abstract

A variety of potentially inhibitory degradation products are produced during pretreatment of lignocellulosic biomass. Qualitative and quantitative interrogation of pretreatment hydrolysates is paramount to identifying potential correlations between pretreatment chemistries and microbial inhibition in downstream bioconversion processes. In the present study, corn stover, poplar, and pine feedstocks were pretreated under eight different chemical conditions, which are representative of leading pretreatment processes. Pretreatment processes included: 0.7% H2SO4, 0.07% H2SO4, liquid hot water, neutral buffer solution, aqueous ammonia, lime, lime with oxygen pressurization, and wet oxidation. Forty lignocellulosic degradation products resulting from pretreatment were analyzed using high performance liquid chromatography in combination with UV spectroscopy or tandem mass spectrometry detection (HPLC-PDA-MS/MS) and ion chromatography (IC). Of these compounds, several have been reported to be inhibitory, including furfural, hydroxymethyl furfural, ferulic acid, 3,4-dihydroxybenzaldehyde, syringic acid among others. Formation and accumulation of monitored compounds in hydrolysates is demonstrated to be a function of both the feedstock and pretreatment conditions utilized. Biotechnol. Bioeng. 2010;107: 430–440. © 2010 Wiley Periodicals, Inc.

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