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- Title
Pretreatment of sugarcane bagasse by acidified aqueous polyol solutions.
- Authors
Zhang, Zhanying; O’Hara, Ian M.; Doherty, William O. S.
- Abstract
Pretreatments of sugarcane bagasse by three high boiling-point polyol solutions were compared in acid-catalysed processes. Pretreatments by ethylene glycol (EG) and propylene glycol solutions containing 1.2 % H 2SO 4 and 10 % water at 130 °C for 30 min removed 89 % lignin from bagasse resulting in a glucan digestibility of 95 % with a cellulase loading of ~20 FPU/g glucan. Pretreatment by glycerol solution under the same conditions removed 57 % lignin with a glucan digestibility of 77 %. Further investigations with EG solutions showed that increases in acid content, pretreatment temperature and time, and decrease in water content improved pretreatment effectiveness. A good linear correlation of glucan digestibility with delignification was observed with R 2 = 0.984. Bagasse samples pretreated with EG solutions were characterised by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction, which confirmed that improved glucan enzymatic digestibility is mainly due to delignification and defibrillation of bagasse. Pretreatment by acidified EG solutions likely led to the formation of EG-glycosides. Up to 36 % of the total lignin was recovered from pretreatment hydrolysate, which may improve the pretreatment efficiency of recycled EG solution.
- Subjects
SUGARCANE; BAGASSE; ACIDIFICATION; AQUEOUS solutions; POLYOLS; SOLUTION (Chemistry); LIGNINS
- Publication
Cellulose, 2013, Vol 20, Issue 6, p3179
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-013-0068-3