Rapid Biomass Quality Determination of Corn Stover Using Near-Infrared Reflectance Spectroscopy
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Rapid Biomass Quality Determination of Corn Stover Using Near-Infrared Reflectance Spectroscopy Patrick T. Murphy & Kenneth J. Moore & D. Raj Raman & Robert P. Anex & Steven L. Fales
Published online: 24 August 2011 # Springer Science+Business Media, LLC. 2011
Abstract Near-infrared reflectance spectroscopy (NIRS) has been used extensively in the forage industry for rapid measurement of forage constituents and could be useful for determining quality of biomass feedstocks at the point of delivery. In previous work, we developed an assay that partitions feedstock carbohydrates based on their availability to be converted to fermentable sugars, including nonstructural carbohydrates (CN), biochemically available carbohydrates (CB) with an associated first-order availability rate constant (kB), and unavailable carbohydrates (CU). Additional quality parameters measured included neutral detergent lignin (NDL), total available carbohydrates (CA), and total carbohydrates (CT). We evaluated the variability of biomass quality parameters in a set of corn stover samples and developed calibration equations for determining parameter values using NIRS. Fifty-two corn stover samples harvested in Iowa and Wisconsin in 2005 and 2006 were analyzed using a high-throughput assay for determining feedstock quality for biochemical conversion. NonP. T. Murphy (*) Department of Agricultural and Biological Engineering, Purdue University, 225 S. University St, West Lafayette, IN 47907-2093, USA e-mail: [email protected] K. J. Moore : S. L. Fales Department of Agronomy, Iowa State University, Ames, IA 50011, USA D. R. Raman Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA 50011, USA R. P. Anex Department of Biological Systems Engineering, University of Wisconsin Madison, Madison, WI 53706, USA
structural carbohydrates ranged from 84 to 155 gkg−1 dry matter (DM); CB ranged from 354 to 557 gkg−1 DM; kB ranged from 0.199 to 0.330 h−1; CA ranged from 463 to 699 gkg−1 DM, and NDL ranged from 32 to 74 gkg−1 DM. Significant differences (P
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