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Table 5 Total mono- and oligosaccharides organic acids and furans in wash water of HTT solid fraction

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

Monosaccharides

6.81a ± 0.07

4.13b ± 0.20

3.19c ± 0.19

1.10d ± 0.07

1.28d ± 0.04

1.53d ± 0.01

Oligosaccharides

5.01d ± 0.43

11.47c ± 0.28

18.20a ± 0.45

5.73d ± 0.45

10.25c ± 0.41

13.46b ± 0.21

C5:C6 ratio of oligomers

na.

1.4

3.6

3.1

4.3

6.4

Organic acids

2.65b ± 0.06

2.94b ± 0.14

2.74b ± 0.22

5.70a ± 0.14

5.81a ± 0.12

5.77a ± 0.03

Furans

0.11c ± 0.00

0.24b ± 0.01

0.46a ± 0.03

0.07c ± 0.00

0.12c ± 0.00

0.21b ± 0.00

  1. HTT temperature presented as °C. Numbers are presented as weight percentages of DM in the HTT solid fraction, followed by standard deviations (a,b,c,d). Different superscript letters a,b,c,d indicate significantly different values (P <0.05) row-wise). DM, dry matter; HTT, hydrothermal treatment.