Summary
A variety of chemicals are produced upon pretreatment of lignocellulosic biomass. Aliphatic acids, aromatic acids, aldehydes, and phenolic compounds are of particular interest due to their presumed inhibitory influence on downstream enzymatic or microbial steps in biomass-to-ethanol conversion. Herein, we describe a series of analytical protocols that collectively enable quantitative monitoring of 40 potential fermentation inhibitors in biomass pretreatment samples. Solid samples are accommodated by first employing pressurized fluid extraction to generate an aqueous “wash stream.” Sample preparation for liquids involves an initial precipitation-filtration step, followed by liquid–liquid extraction and reconstitution of extracts in water. Samples are analyzed using high–performance liquid chromatography (HPLC) in combination with ultraviolet (UV) absorbance and tandem mass spectrometry (MS/MS) detection. A standard addition approach is utilized for quantitation to alleviate complications arising from co-extracted sample matrix.
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Acknowledgments
This work was supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2005–35504–16355. The authors would also like to acknowledge the following collaborators for providing pretreatment samples: Dr. G. Peter van Walsum (University of Maine); Dr. Bruce E. Dale, Dr. Balan Venkatesh, and Mr. Shishir Chundawat (Michigan State University); Dr. Nancy N. Nichols (USDA-ARS, Peoria, IL); Dr. Joy D. Peterson (University of Georgia).
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Sharma, L.N., Becker, C., Chambliss, C.K. (2009). Analytical Characterization of Fermentation Inhibitors in Biomass Pretreatment Samples Using Liquid Chromatography, UV-Visible Spectroscopy, and Tandem Mass Spectrometry. In: Mielenz, J. (eds) Biofuels. Methods in Molecular Biology, vol 581. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-214-8_10
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DOI: https://doi.org/10.1007/978-1-60761-214-8_10
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