Table 1 Quantity of organic acid held in the pretreatment liquor, expressed as g per kg of original straw

180

 Straw

17.30 ± 0.34

11.76 ± 0.25

1.34 ± 0.00

1.80 ± 0.14

 Husk

3.57 ± 0.05

2.52 ± 0.07

0.51 ± 0.05

0.41 ± 0.00

190

 Straw

16.56 ± 0.05

10.21 ± 0.06

1.21 ± 0.04

2.07 ± 0.07

 Husk

8.12 ± 0.16

8.06 ± 0.06

0.88 ± 0.02

2.19 ± 0.00

200

 Straw

16.60 ± 0.94

9.37 ± 0.66

1.50 ± 0.08

1.43 ± 0.08

 Husk

6.96 ± 0.41

8.15 ± 0.81

1.18 ± 0.05

3.21 ± 0.51

210

 Straw

15.05 ± 0.30

9.78 ± 0.11

1.30 ± 0.04

1.19 ± 0.04

 Husk

6.12 ± 2.40

8.24 ± 2.57

1.58 ± 0.33

2.69 ± 0.78

220

 Straw

13.60 ± 0.69

8.26 ± 0.41

0.99 ± 0.08

0.75 ± 0.03

 Husk

6.87 ± 0.03

11.07 ± 0.04

2.58 ± 0.00

2.56 ± 0.02

230

 Straw

1.81 ± 0.09

1.77 ± 0.05

0.35 ± 0.00

0.37 ± 0.02

 Husk

N.D.

N.D.

N.D.

N.D.