TABLE 2

Switchgrass composition for raw, nontreated material and material exposed to two microbial and hydrothermal treatments

SwitchgrassTreatmentaGlucanXylanArabinanInert material
Concn (%)bMass (g)cConcn (%)Mass (g)Concn (%)Mass (g)Concn (%)Mass (g)
COMT3(−)Raw36 ± 0.81.826 ± 1.31.33.9 ± 0.30.234 ± 2.41.7
T→M→T→M46 ± 1.30.717 ± 0.80.40.8 ± 0.00.037 ± 2.10.5
COMT3(+)Raw34 ± 7.01.726 ± 0.31.33.5 ± 0.10.237 ± 0.91.9
T→M→T→M45 ± 1.20.611 ± 0.20.1NDd0.044 ± 1.40.5
MYB WTRaw37 ± 1.41.824 ± 0.31.12.6 ± 0.10.137 ± 1.61.9
T→M→T→M60 ± 0.91.312 ± 0.40.3ND0.027 ± 1.30.6
MYB TransRaw37 ± 1.61.925 ± 0.31.33.3 ± 0.40.235 ± 1.51.7
T→M→T→M53 ± 1.10.98.8 ± 0.40.2ND0.038 ± 1.30.7
Cave-in-RockRaw37 ± 1.11.925 ± 0.81.23.2 ± 0.30.235 ± 2.11.8
T→M→T→M55 ± 1.40.98.6 ± 0.20.1ND0.036 ± 1.50.5
  • a M, microbial treatment; T, hydrothermal treatment. Switchgrass was washed following each treatment step, and the material after washing was used for the next planned treatment.

  • b Values are means ± standard deviations.

  • c The average mass compositional values were calculated based on a 5-g/liter initial loading.

  • d ND, none detected.