|  | Hydrolysate | |||
---|---|---|---|---|---|
 |  | I | II | III | IVa |
Pretreatment | Alkali | Ca(OH)2 | Ca(OH)2 | NaOH | NaOH |
 | g g-1 | 0.10 | 0.10 | 0.12 | 0.09 |
 | mM | 157 | 164 | 334 | 265 |
 | pHinitial | 10.4 | 10.2 | 11.1 | 11.0 |
pH adjustment | Acid | H2SO4 | H3PO4 | CH3COOH | CH3COOH |
 | mM | 123 | 88 | 302 | 123 |
 | pHend | 4.8 | 5.1 | 4.9 | 4.8 |
Enzymatic hydrolysis | Enzyme 1 | Cellubrix | GC220 | Cellubrix | GC220 |
 | Enzyme 2 | Novozym 188 | - | Novozym 188 | - |
Hydrolysate composition | |||||
Sugars (g l-1) | Arabinose | 1.8 | 1.5 | 1.6 | 1.1 |
 | Galactose | 0.3 | 0.2 | 0.2 | 0.0 |
 | Glucose | 26.3 | 19.9 | 33.0 | 29.0 |
 | Xylose | 11.5 | 7.6 | 11.1 | 10.0 |
Total carbohydrates | 39.9 | 29.1 | 46.0 | 40.1 | |
Organic acids | Acetic acidb | 84 | 62 | 419 | 130 |
(mM) | Lactic acidc | 12 | 10 | 14 | 1.1 |