*2.3. Compositional Analysis*

The amounts of structural carbohydrates (glucan, xylan and arabinan) and lignin in rice straw and wheat bran regarding their dry matter content (*w*/*w*%) were determined according to the method published by the National Renewable Energy Laboratory [32]. Determination of the protein content of the raw materials was performed by using the Dumas method [33]. The inorganic content was determined gravimetrically after incineration of the raw materials in muffle furnace equipped with a ramping program [34].

The ground rice straw contained 38.8% glucan, 19.4% xylan, 3.8% arabinan, 14.0% lignin, 3.7% protein, and 13.2% inorganic compounds (*w*/*w*, on dry basis). Wheat bran contained 26.6% glucan, 16.8% xylan, 9.5% arabinan, 6.4% lignin 17.4% protein, and 5.7% inorganic compounds (*w*/*w*, on dry basis).
