In the case of
the steam explosion, the most marked effect was on the hemicellulose
content, since under the operating conditions and with the
presence of sulfuric acid as catalyst the autohydrolysis of acetyl
groups is favored, decreasing the hemicellulose content in the solid
phase. Besides, it has been reported that this pretreatment also allows
a partial hydrolysis of lignin, through the homolytic cleavage
of b-O-4 ether linkages and other unstable acid moieties, producing
a series of cinnamyl alcohol derivatives and condensation byproducts
[30].
In the case ofthe steam explosion, the most marked effect was on the hemicellulosecontent, since under the operating conditions and with thepresence of sulfuric acid as catalyst the autohydrolysis of acetylgroups is favored, decreasing the hemicellulose content in the solidphase. Besides, it has been reported that this pretreatment also allowsa partial hydrolysis of lignin, through the homolytic cleavageof b-O-4 ether linkages and other unstable acid moieties, producinga series of cinnamyl alcohol derivatives and condensation byproducts[30].
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