These processes include liquid hot water (LHW) also called autohydrolysis, steam explosion al. but most of the conditions only extract hemicellulose under polymeric form or slightly degraded to oligomers or suffer from toxicity and yields limitations for example. The last two treatments presented (acidic conditions) are known to be most efficient for the complete breakdown of the hemicellulose to the monosaccharides units which is more interesting to obtain building blocks for polymer synthesis purposes and will thus be studied in more detail below.