Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7064408 | Biomass and Bioenergy | 2014 | 7 Pages |
Abstract
The analysis results of Klason lignin and structural carbohydrates determined by downscaled analysis methods using 50Â mg and 5Â mg biomass and glass microfiber filters for the filtration of acid-insoluble lignin, were compared to a conventional method using 300Â mg biomass and ceramic crucibles. The usage of microfiber filters reduces space requirement in oven and furnace to a minimum and speeds up the filtration of Klason lignin about three-fold. Furthermore, tedious cleaning of crucibles is unnecessary which additionally increases the number of samples that can be analyzed in a given time frame. The analysis of 5 feedstocks comprising herbaceous, hard- and softwood, revealed no significant differences of hemicellulosic sugars between the 50Â mg microfiber and the 300Â mg crucible method. The 50Â mg microfiber method resulted in Klason lignin values in the range of â6.1% to +4.0% (relative) and glucan values in the range of â0.8% to +3.7% (relative) of the values obtained with the 300Â mg crucible method. The 50Â mg microfiber method was highly reproducible with relative standard deviations (RSD%) of 0.27-0.56% (average 0.38%) for Klason lignin and 0.54%-1.46% (average 1.01%) for glucan. Compared to the 50Â mg microfiber method, the 5Â mg microfiber method resulted in similar deviations of Klason lignin and glucan from the 300Â mg method values. However, the reproducibility was slightly lower. Overall, the 50Â mg and 5Â mg microfiber method reflected the actual biomass composition with sufficient accuracy and are therefore recommended as alternative methods or when downscaling of the analysis is required.
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Physical Sciences and Engineering
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Authors
Ana B. Ibáñez, Stefan Bauer,