Since every lignocellulosic feedstock has its own composition regarding the contents of water, extractives, ash, carbohydrates and lignin it is necessary to determine the composition for all used feedstocks which are shown in Figure . are predominant in the lignin fraction of cocoa shells. The composition of the lignocellulosic feedstock is completely heterogeneous. The largest amount of the natural raw material, with exception of wheat straw, consists of extractives such as nonstructural low molecular weight saccharides and carboxylic acids. The valuable glycans will be obtained from cellulose and hemicellulose. Hereby wheat straw has the highest content of cellulose and hemicellulose with 19.2 % and 18.9 % respectively which makes up nearly 40 % of the raw material. This amount is lower in the other natural raw materials with 31 % for beet pulp, 23 % for apple pomace, and 12 % for cocoa shells. On the other hand, the content of tannin-like substances with small amounts of lignin is highest in the cocoa shells with 32 % , while it ranges between 12 % and 19 % in the other natural raw materials used. The structure of the biomass has a decisive influence on the mechanocatalytic partial depolymerization. Strong binding of the polysaccharides into the lignin matrix prevents depolymerization. Since cocoa shells have the highest content of rigid aromatic molecules in combination with a lower content of hemicellulose and cellulose we expect that the mechanocatalytic partial depolymerization under the same conditions will be more hindered than for wheat straw since it has the highest content of hemicellulose as well as cellulose.