γ射线辐照协同水热处理制备油茶壳低聚木糖的工艺研究OACSTPCD

In order to improve the economic efficiency of lignocellulosic biorefinery by using low-cost and renewable agricultural and forestry biomass to produce high-valuable xylo-oligosaccharides,this study used the by-product,i.e.Camellia oleifera shell from camellia oil processing,as the raw material.Four factors,including the absorbed dose(A),hydrothermal treatment temperature(B),hydrothermal treatment time(C)and solid-liquid ratio(D)were selected,and the xylo-oligosaccharide conversion rate was used as the evaluation index.Furthermore,the single factor tests and orthogonal array design methods were used to optimize the technological conditions for xylo-oligosaccharide preparation through 60Co-γ irradiation combined with hydrothermal treatment.According to the single factor tests,it was found that the xylo-oligosaccharide conversion rate of Camellia oleifera shell increased gradually with the increase of absorbed dose and solid-liquid ratio;and increased at first and then decreased with the increasing of hydrothermal treatment temperature and prolonging of incubation time.Based on the results of orthogonal array design,impacts of the four factors(A-D)on the conversion rate of xylo-oligosaccharide followed the order of:A>B>D>C.As a result,the optimum technological conditions were determined as:absorbed dose at 400 kGy,hydrothermal treatment temperature at 200℃,hydrothermal treatment time at 20 min,and solid-liquid ratio at 1∶10 g·mL-1.Under this condition,the xylo-oligosaccharide conversion rate of Camelia oleifera shell was 74.33%,which was 22.61 percentage points higher than that of the control.The results provided more technical reference for the preparation of high-valuable xylo-oligosaccharide from Camellia oleifera shell.