Abstract: Tannin from Tara pods is hydrolyzed for preparation of gallic acid, whose residues is rich in cellulose. We discussed the effects of various factors on the yield of reducing sugar from Tara fiber residues. By the single factor experiment, we optimized four factors including the ratio of solid-liquid, enzymatic temperature, pH and enzymatic time by orthogonal experiments L₁₆(4)⁵. The optimum conditions were under the ratio of solid-liquid of 1∶6 g·mL^-1, enzymatic temperature of 55℃, pH of 6 and enzymatic time of 48 h, and the yield of reducing sugar from Tara fiber residues was 43.95%.

Key words: Tara fiber residues, cellulase, enzymatic hydrolysis, yield of reducing sugar