Table 1 Pretreatment conditions and chemical composition of the pretreated substrates

SO ₂ -steam pretreatment

Ara

Gal

Glu

Xyl

Man

AIL

Douglas fir

195°C, 4.5 min, 4.5% SO₂

0.4

1.1

48.2

0.9

2.1

47.2

SPDF

Poplar

180°C, 5 min, 3% SO₂

0.3

0.8

59.8

6.6

1.3

30.4

SPP180

Poplar

200°C, 5 min, 3% SO₂

0.3

0.8

59.3

3.72

1.2

33.9

SPP200

Ethanol-organosolv pretreatment

Lodgepole pine

170°C, 60 min; 65% EtOH, 1.1% H₂SO₄

bdl

bdl

74.8

1.6

1.8

17.3

OPLP