The wastematerial was firstly dried to the constant weight (80◦C for 24 h). The coffee oilextraction was performed with n-hexane as described by Al-Hamamre et al. [17]. Tohydrolyze the hemicelluloses of raw material, 15% (w/v) SCG were firstly treated by1 vol.% H2SO4for 90 min at 121◦C