| Autor: |
Arthur J. Stipanovic, Raymond C. Francis, Vincent A. Barber, Samar K. Bose, David J. Kiemle, Ericka F. Alves |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Carbohydrate Polymers. 78:396-401 |
| ISSN: |
0144-8617 |
| Popis: |
The range of xylan content reported for sugar maple ( Acer saccharum ) is wider than for most hardwoods. Credible values have been reported that range from less than 16 wt% to more than 19 wt% based on extractive-free wood. Carbohydrate composition of biomass is normally determined by a two stage H 2 SO 4 hydrolysis followed by quantification of the sugar monomers. Acetic and uronic acids are also quantified for xylan-rich materials. In this research, the H 2 SO 4 hydrolysis conditions were modified and an average xylan content of 18.7% was obtained for sugar maple with a standard deviation ( SD ) of 0.41% for eight analyses. Minor refinements were made and an average of 18.6% ( SD = 0.29%) was obtained for another eight analyses. On this occasion the acetyl to xylose mole ratio was 0.71 with a standard deviation of only 0.008. Proton NMR was utilized in quantifying sugar monomers and acetic acid. The modified hydrolysis procedure gave all the expected results for Betula papyrifera , a species without much controversy regarding its carbohydrate composition. A high percentage of glucan plus xylan was also obtained for an experimentally grown poplar with a low lignin content of 17.7%. The summative analyses varied from 99.7% to 101.5% for the three species. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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