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. 2011 Nov 7;4(11):1985–2002. doi: 10.3390/ma4111985

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© 2011 by the authors;

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Degree of crystallinity of cellulose from a Populus standard after holocellulose pulping and hemicellulose removal by acid hydrolysis in 2.5 M HCl at various residence times as measured by a ¹³C CP sequence (◆) and ¹³C CP sequence with 6.5 ms ¹H spin-lock filter (■). The dotted line represents the normal 4 h reaction time for hemicellulose removal typically employed. The error bars represent thee standard deviations of typical variation associated with the measurement.