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In the field of green chemistry is the study of new solvent systems the great challenge. Deep eutectic solvents (DESs) represent the principles of green chemistry. Currently are preferred these new types of chemicals suitable for the selective removal of extractives, lignin or polysaccharides from biomass. Biomass is selectively treated to the individual fractions, of which is possible with following purification to obtain products in higher yields and purity. In this work are describes various deep eutectic solvents, which can be used for pretreatment of biomass.