Fig. 2

The enzymatic hydrolysis process of vinegar untreated and pretreated with steam explosion. a–c The glucose yields from the hydrolysis of VR with different pretreatment conditions at different enzymolysis time. d–f The xylose yields and g–i the arabinose yields, respectively. The X-axis represents the enzymolysis time. The SE pressures are 1.5, 2.0 and 2.5 MPa, which are noted on the figures. The VR without SE pretreatment was set as control