Determination of hexenuronic acid and residual lignin in pulps by UV spectroscopy in cadoxen solutions
authors Evtuguin, DV; Daniel, AID; Neto, CP
nationality International
journal JOURNAL OF PULP AND PAPER SCIENCE
author keywords kraft pulps; uronic acids; lignins; ultraviolet spectroscopy; cadoxene
keywords PINE KRAFT PULP; NMR-SPECTROSCOPY; XYLAN; HYDROLYSIS; WOOD; ECF
abstract A new method for the simultaneous determination of hexenuronic acid (HexA) and residual lignin in kraft pulps by UV spectroscopy in cadoxen solutions is proposed. Unbleached or partially bleached hardwood or softwood pulps soluble in cadoxen can be analyzed. The HexA content determined by this new method is about 5% higher that obtained by the conventional acid hydrolysis technique. The residual lignin concentrations in the pulps afforded by this approach are lower than those determined without taking into account the presence of HexA. The advantages and limitations of the method are discussed.
publisher PULP & PAPER TECHNICAL ASSOCIATION CANADA
issn 0826-6220
year published 2002
volume 28
issue 6
beginning page 189
ending page 192
web of science category Materials Science, Paper & Wood
subject category Materials Science
unique article identifier WOS:000176672400002

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