Room temperature(about 16°C)pretreatment of pubescens by Al Cl_3aqueous solution with different concentrations was studied.In the presence of 20 wt%Al Cl_3for pretreatment within 24 h,the degradation of hemicellu...Room temperature(about 16°C)pretreatment of pubescens by Al Cl_3aqueous solution with different concentrations was studied.In the presence of 20 wt%Al Cl_3for pretreatment within 24 h,the degradation of hemicellulose reached 19.5 wt%without obvious degradation of cellulose and lignin(2.7 wt%and2.4 wt%,respectively).The extracted hemicellulose from pubescens could be divided into two parts,i.e.,small molecular weight products(saccharides and carboxylic acid,which occupy approximately 28.2%)and oligomers(approximately 71.8%).Low concentration of AlCl_3(<10 wt%)slightly promoted the formation of oligomers with molecular weight in the range of 200–1000 Da,while high concentration of Al Cl_3(10–20 wt%)promoted the formation of oligomers in the molecular weight range above 20,000 Da.The conversion of hemicellulose with acceptable selectivity resulted in the cleavage of bond between hemicellulose and lignin yielding three classical Lignin-Carbohydrate complexes.展开更多
基金financially supported by the National Natural Science Foundation of China (No.21536007)111 project (B17030)the Basic scientific research fund of MOE
文摘Room temperature(about 16°C)pretreatment of pubescens by Al Cl_3aqueous solution with different concentrations was studied.In the presence of 20 wt%Al Cl_3for pretreatment within 24 h,the degradation of hemicellulose reached 19.5 wt%without obvious degradation of cellulose and lignin(2.7 wt%and2.4 wt%,respectively).The extracted hemicellulose from pubescens could be divided into two parts,i.e.,small molecular weight products(saccharides and carboxylic acid,which occupy approximately 28.2%)and oligomers(approximately 71.8%).Low concentration of AlCl_3(<10 wt%)slightly promoted the formation of oligomers with molecular weight in the range of 200–1000 Da,while high concentration of Al Cl_3(10–20 wt%)promoted the formation of oligomers in the molecular weight range above 20,000 Da.The conversion of hemicellulose with acceptable selectivity resulted in the cleavage of bond between hemicellulose and lignin yielding three classical Lignin-Carbohydrate complexes.
