Pretreatment with [C 4 C 1 im][HSO 4 ] decreased the xylan content for T-aspen from 2.6% to 1.4%, but these small fractions were probably not significant.
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Comparison of [HSO<sub>4</sub>]<sup>-</sup>, [Cl]<sup>-</sup> and [MeCO<sub>2</sub>]<sup>-</sup> as anions in pretreatment of aspen and spruce with imidazolium-based ionic liquids.
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