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Table 3 Compositions of solid fractions after HTT treatments at different temperatures (°C)

From: Ensiling and hydrothermal pretreatment of grass: consequences for enzymatic biomass conversion and total monosaccharide yields

Biomass Grass Grass silage
HTT temperature 170 180 190 170 180 190
  (w/w)% of DM (w/w)% of DM
Glucan 31.2d ± 0.45 33.0d ± 0.16 35.0cd ± 0.43 36.9c ± 0.43 40.6b ± 0.00 42.8a ± 1.10
Xylan 18.7a ± 0.40 17.1b ± 0.05 10.3c ± 0.09 19.1a ± 0.09 17.5b ± 0.35 10.0c ± 0.21
Arabinan 2.7a ± 0.01 1.8b ± 0.07 1.0d ± 0.00 2.7a ± 0.00 1.3c ± 0.01 0.5e ± 0.01
Klason lignin 18.8a ± 0.59 19.0a ± 0.67 17.0a ± 0.58 13.8b ± 0.58 13.5b ± 0.07 13.9b ± 0.30
Ash 7.4ab ± 0.52 8.2a ± 0.18 8.4a ± 0.11 7.8ab ± 0.11 6.8b ± 0.09 6.8b ± 0.02
Ethanol Extractives 11.8c ± 0.35 16.4b ± 0.49 22.8a ± 0.86 15.4b ± 0.16 18.2b ± 0.76 24.5a ± 0.61
Residual 9.5 4.4 5.6 4.2 2.2 1.4
DM recovery in solid fraction 75.3 69.6 61.6 67.5 61.5 58.8
  1. Numbers are presented as weight percentages of DM in the HTT solid fraction, followed by standard deviations (except for ‘DM recovery in solid fraction’, which is the percentage of DM left in solid fraction after HTT pretreatment, based on mass balance after HTT pretreatment. Different superscript letters indicate significantly different values (P <0.05) row-wise; (similar superscript letters indicate no statistically significant difference). DM, dry matter; HTT, hydrothermal treatment.