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Effect of Pretreatment Severity on Accumulation of Major Degradation Products from Dilute Acid Pretreated Corn Stover and Subsequent Inhibition of Enzymatic Hydrolysis of Cellulose

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Abstract

The concept of reaction severity, which combines residence time and temperature, is often used in the pulp and paper and biorefining industries. The influence of corn stover pretreatment severity on yield of sugar and major degradation products and subsequent effects on enzymatic cellulose hydrolysis was investigated. The pretreatment residence time and temperature, combined into the severity factor (Log R o), were varied with constant acid concentration. With increasing severity, increasing concentrations of furfural and 5-hydroxymethylfurfural (5-HMF) coincided with decreasing yields of oligosaccharides. With further increase in severity factor, the concentrations of furans decreased, while the formation of formic acid and lactic acid increased. For example, from severity 3.87 to 4.32, xylose decreased from 6.39 to 5.26 mg/mL, while furfural increased from 1.04 to 1.33 mg/mL; as the severity was further increased to 4.42, furfural diminished to 1.23 mg/mL as formate rose from 0.62 to 1.83 mg/mL. The effects of dilute acid hydrolyzate, acetic acid, and lignin, in particular, on enzymatic hydrolysis were investigated with a rapid microassay method. The microplate method gave considerable time and cost savings compared to the traditional assay protocol, and it is applicable to a broad range of lignocellulosic substrates.

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Acknowledgment

This work was funded by the United States Department of Agriculture (USDA)-USDA-CSREES-NRI, # 2005-35504-16335.

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Authors and Affiliations

  1. Department of Chemical Engineering, Hankyong National University, Anseong, Gyeonggi, Korea (ROK), 456-749

    Byung-Hwan Um

  2. Forest Bioproducts Research Institute, Department of Chemical and Biological Engineering, University of Maine, Orono, ME, 04469, USA

    G. Peter van Walsum

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Correspondence to G. Peter van Walsum.

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Um, BH., van Walsum, G.P. Effect of Pretreatment Severity on Accumulation of Major Degradation Products from Dilute Acid Pretreated Corn Stover and Subsequent Inhibition of Enzymatic Hydrolysis of Cellulose. Appl Biochem Biotechnol 168, 406–420 (2012). https://doi.org/10.1007/s12010-012-9784-7

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