Extrusion Degradation and Structural Characterization of Lignocellulose in Spent Lentinus edodes Substrate
In order to develop a new processing method of spent Lentinus edodes substrate and promote its efficient conversion and utilization,spent Lentinus edodes substrate was taken as the material,and the lignocellulose content,lignocellulose functional groups,relative crystallinity of cellulose and fiber morphology of spent Lentinus edodes substrate after extrusion treatment were analyzed by Van Soest method,FTIR,X-ray diffraction method and optical microscopic imaging.Results showed that the degradation degree of lignocellulose components was different after extrusion treatment.After the 40%water extrusion and 50%water extrusion,the lignocellulose content decreased by 13.863%and 11.264%respectively,the cellulose content decreased by 19.003%and 16.630%respectively,the holocellulose content decreased by 17.357%and 11.343%respectively,and the lignin content decreased by 6.574%and 11.099%respectively.The cellulose showed a faster degradation rate than hemicellulose and lignin.Compared with 50%water extrusion,the 40%water extrusion had more significant degradation effect on hemicellulose and holocellulose.The degradation rates were increased by 12.131%and 6.783%,respectively.FTIR showed that the main absorption peaks position of the lignocellulose infrared spectral characteristic functional groups did not change,but the characteristics and intensity changed.It indicated that the extrusion treatment had a degradation effect on the components of lignocellulose,and the hemicellulose was more likely to degrade under low moisture conditions,which was consistent with the extrusion degradation of lignocellulose components.The spent Lentinus edodes substrate before and after extrusion had typical cellulose X-ray diffraction characteristics,the crystalline region of cellulose was destroyed after extrusion,and the relative crystallinity of cellulose decreased by 21.10%and 18.00%after the 40%water extrusion and 50%water extrusion,respectively.The fiber length,width and length-width ratio showed a decreasing trend.Observed by the microscope,the cellulose wall and inner lumen were further destroyed after extrusion,and the sheet structure of bulky state increased significantly.Therefore,the extrusion treatment could effectively degrade the lignocellulose of spent Lentinus edodes substrate,destroy its biomass structure,and change the infrared spectrum absorption peak,cellulose crystallinity and fiber morphology.Among them,the 40%water extrusion was better in degradation effect.
国家科技期刊平台
NSTL
万方数据
