Fig. 1.

The effect of pretreatment conditions on the enzymatic hydrolysis of the pretreated RS. The sugar yield of untreated RS was pointed out with dashed line. The experimental groups Fenton-A is 0.04 M FeCl₃ and 3 M H₂O₂, Fenton-B is 0.03 M FeCl₃ and 2.25 M H₂O₂, Fenton-C is 0.02 M FeCl₃ and 1.5 M H₂O₂, Fenton-D is 0.01 M FeCl₃ and 0.75 M H₂O₂, and Fenton-E is 0.02 M FeCl₂ and 1.5 M H₂O₂