Dilute acid hydrolysis of presscakes from silage and grass to recover hemicellulose-derived sugars
| Autor: | S. Kromus, Herbert Danner, Rudolf Braun, Markus Neureiter, Michael Narodoslawsky, Christiane Thomasser, S. Frühauf |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Environmental Engineering
Silage Carbohydrates Bioengineering Raw material Poaceae Hydrolysis chemistry.chemical_compound Polysaccharides Hemicellulose Food science Sugar Waste Management and Disposal Renewable Energy Sustainability and the Environment Chemistry Extraction (chemistry) food and beverages General Medicine Hydrogen-Ion Concentration Sulfuric Acids Kinetics Agronomy Yield (chemistry) |
| Zdroj: | Bioresource Technology. 92:21-29 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2003.08.001 |
| Popis: | Grass and silage presscakes from various types of raw materials were hydrolyzed with dilute acid at moderate conditions to recover hemicellulose-derived sugars. Extracting the material with cold water prior to hydrolysis significantly increased the yield. The poor performance without extraction was due to the high buffer capacity of the material. The best results were obtained with extracted grass and silage from a permanent pasture and extracted clover/grass silage. The highest observed sugar yield was 16.43 g/100 g dry-matter, which represents approximately 25% of the available sugars and 60% of the hemicellulose fraction. Including the soluble sugar oligomers, the yields were even higher (up to 20 g/100 g dry-matter). A statistical experiment design with extracted clover/grass silage was performed to estimate the effects of temperature, time, and dry-matter concentration. Acid and dry-matter concentration had the highest effect on sugar yield, whereas temperature and acid concentration were mainly responsible for forming sugar degradation products. These findings agree with recent kinetic theories. Yields in this experiment were comparable to those of other lignocellulosic materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect