FIELD: biotechnology.
SUBSTANCE: in the invention, a method of preliminary treatment for saccharification of plant fiber material is claimed lying in immersing the plant fiber material in a solution which comprises a polar organic solvent in which the heteropoly acid is dissolved before the saccharification of cellulose contained in the plant fiber material, and then distillation of the organic solvent from the immersed plant fiber material to obtain a preliminary treated mixture containing heteropoly acid and preliminary treated plant fiber material in a ratio of 3:1. Immersion of the plant fiber material is carried out at a temperature of 15 to 40°C. The heteropoly acid is represented by the chemical formula HwAxByOz, where A represents one element selected from the group consisting of phosphorus, silicon, germanium, arsenic and boron; and B represents one element selected from the group consisting of wolframium, molybdenum, vanadium and niobium; and the polar organic solvent is ethanol.
EFFECT: improvement of the method.
9 cl, 4 ex, 1 tbl, 6 dwg
