Improving the thermal stability of different types of xylan by acetylation
| Autor: | Danila Morais de Carvalho, Mikael Lindström, Célia Marchand, Olena Sevastyanova, Francisco Vilaplana, Jennie Berglund |
|---|---|
| Přispěvatelé: | Department of Food and Nutrition, Food Materials Science Research Group |
| Rok vydání: | 2019 |
| Předmět: |
STRUCTURAL-CHARACTERIZATION
Hardwood Softwood Polymers and Plastics 116 Chemical sciences 02 engineering and technology HEMICELLULOSES CHEMICAL-COMPOSITION WOOD 010402 general chemistry Molecular weight 01 natural sciences chemistry.chemical_compound BIRCH Materials Chemistry EUCALYPTUS Thermal stability Cellulose SUGARCANE BAGASSE Organic Chemistry Acetylation Straw 021001 nanoscience & nanotechnology Xylan ACYLATION 0104 chemical sciences Sugarcane residues ROOM-TEMPERATURE 416 Food Science chemistry 216 Materials engineering CELLULOSE 0210 nano-technology Bagasse Glass transition Nuclear chemistry |
| Zdroj: | Carbohydrate Polymers. 220:132-140 |
| ISSN: | 0144-8617 |
| Popis: | The impact of various degrees of acetylation on improving the thermal stability of xylan isolated from different botanical source has been studied; methylglucuronoxylan from birch and eucalyptus, arabinoglucuronoxylan from spruce and glucuronoarabinoxylan from sugarcane bagasse and straw. The lower molecular weight of nonacetylated methylglucuronoxylan (17.7-23.7 kDa) and arabinoglucuronoxylan (16.8 kDa) meant that they were more soluble in water than glucuronoarabinoxylan (43.0-47.0 kDa). The temperature at the onset of degradation increased by 17-61 degrees C and by 75-145 degrees C for low and high acetylated xylans respectively, as a result of acetylation. A glass transition temperature in the range of 121-132 degrees C was observed for the samples non-acetylated and acetylated at low degree of acetylation (0.0-0.6). The acetylation to higher degrees (1.4-1.8) increased the glass transition temperature of the samples to 189-206 degrees C. Acetylation proved to be an efficient method for functionalization of the xylan to increase the thermal stability. |
| Databáze: | OpenAIRE |
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