Variation of S/G ratio and lignin content in a Populus family influences the release of xylose by dilute acid hydrolysis |
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Authors: | Brian H Davison Sadie R Drescher Gerald A Tuskan Mark F Davis Nhuan P Nghiem |
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Institution: | (1) Oak Ridge National Laboratory, 37831-6124 Oak Ridge, TN;(2) National Renewable Energy Laboratory, 80401 Golden, CO;(3) Martek Biosciences Corporation, 40391 Winchester, KY |
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Abstract: | Wood samples from second generation Populus cross were shown to have different lignin contents and S/G ratios (S: syringyl-like lignin structures; G: guaiacyl-like lignin
structures). The lignin contents varied from 22.7% to 25.8% and the S/G ratio from 1.8 to 2.3. Selected samples spanning these
ranges were hydrolyzed with dilute (1%) sulfuric acid to release fermentable sugars. The conditions were chosen for partial
hydrolysis of the hemicellulosic fraction to maximize the expression of variation among samples. The results indicated that
both lignin contents and S/G ratio significantly affected the yield of xylose. For example, the xylose yield of the 25.8%
lignin and 2.3 S/G (hihg lignin, high S/G) sample produced 30% of the theoretical yield, whereas the xylose yield of the 22.7%
lignin and 1.8 S/G (low lignin, low S/G) was 55% of the theoretical value. These results indicate that lignin content and
composition among genetic variants within a single species can influence the hydrolyzability of the biomass. |
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Keywords: | Cell wall chemistry genetic variation hybrid poplar hydrolysis lignin |
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