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Table 4 Xylose conversion after enzymatic hydrolysis of raw wheat straw (RWS), hydrothermal treated wheat straw (HTT WS), ensiled wheat straw (EWS) and of hydrothermal treated ensiled wheat straw (HTT EWS)

From: Ensiling of wheat straw decreases the required temperature in hydrothermal pretreatment

  Released xylose Xylose conversion yield Overall xylose conversion yield
    Liquid fraction Solid fraction Total
  In (w/w) % of DM in solid fraction In % of xylose in solid fraction In % of xylose in raw material In % of xylose in raw material In % of xylose in raw material
RWS     14.8 ± 1.7e 14.8 ± 1.7e
HTT WS 170°C 11.1 ± 0.3c 40.0 ± 1.0d 3.1 ± 0.0f 39.5 ± 0.9d 42.6 ± 0.9d
HTT WS 180°C 14.6 ± 0.7b 51.6 ± 2.6c 6.2 ± 0.3e 48.6 ± 2.4c 54.9 ± 2.4c
HTT WS 190°C 18.0 ± 1.6a 71.8 ± 6.2b 21.1 ± 1.8c 55.6 ± 4.8b 76.7 ± 4.8b
EWS     10.5 ± 0.4e 10.5 ± 0.4e
HTT EWS 170°C 17.2 ± 1.0a 76.3 ± 4.6ab 14.5 ± 0.0d 67.5 ± 4.1a 82.0 ± 4.1ab
HTT EWS 180°C 16.7 ± 0.8a 81.0 ± 5.0a 26.7 ± 2.3b 61.1 ± 3.1a 87.8 ± 4.9a
HTT EWS 190°C 11.7 ± 0.7c 88.2 ± 5.5a 30.6 ± 0.0a 37.9 ± 2.3d 68.5 ± 2.3d
  1. Released xylose is expressed as (w/w)% of DM in solid fraction after HTT. Xylose conversion yield is expressed as xylose release in % of xylose in the solid fraction after HTT. Overall xylose yield is the xylose release in the liquid fraction after HTT- and in the solid fraction after enzymatic hydrolysis in % of xylose in the raw wheat straw. The results in each row are grouped according to significance (p = 0.05%), where ‘a’ is significantly higher than ‘b’ and so forth.