<正> Synthesized macroporous cross-linked copolymers of methyl acrylate-divinyl benzene (MA-DVB), acrylamide-N,N’-methylenebisacrylamide (AAM-BIS) and their functionalized products were used for immobilization ...<正> Synthesized macroporous cross-linked copolymers of methyl acrylate-divinyl benzene (MA-DVB), acrylamide-N,N’-methylenebisacrylamide (AAM-BIS) and their functionalized products were used for immobilization of aminoacylase from Aspergillus oryzae. Effects of the carrier properties on the activity of immobilized aminoacylase were investigated and effects of substrate concentration, pH, phosphate buffer concentration and temperature on the immobilized aminoacylase were compared with those of the soluble aminoacylase. A column of immobilized aminoaoylase was prepared and used for continuous resolution of N-acyl-DL-methionine; the operational stability of immobilized enzyme was also investigated.展开更多
利用硫酸水解稻壳中的木聚糖,水解条件为硫酸质量分数1.2%,料液比1∶8,水解时间120 min,水解温度123℃,经一系列后续分离纯化工序,制备的D-木糖产品得率为7.14%。采用高效液相色谱面积归一法测定木糖产品中的木糖含量:以超纯水为流动相...利用硫酸水解稻壳中的木聚糖,水解条件为硫酸质量分数1.2%,料液比1∶8,水解时间120 min,水解温度123℃,经一系列后续分离纯化工序,制备的D-木糖产品得率为7.14%。采用高效液相色谱面积归一法测定木糖产品中的木糖含量:以超纯水为流动相,采用Phynomenex公司的Rezex系列Ca2+型糖醇柱(带保护柱)作分离柱,选用示差折光检测器,控制分离温度75℃,分离流速0.6 m L/min,对木糖产品进行测定,其纯度为99.95%。展开更多
文摘<正> Synthesized macroporous cross-linked copolymers of methyl acrylate-divinyl benzene (MA-DVB), acrylamide-N,N’-methylenebisacrylamide (AAM-BIS) and their functionalized products were used for immobilization of aminoacylase from Aspergillus oryzae. Effects of the carrier properties on the activity of immobilized aminoacylase were investigated and effects of substrate concentration, pH, phosphate buffer concentration and temperature on the immobilized aminoacylase were compared with those of the soluble aminoacylase. A column of immobilized aminoaoylase was prepared and used for continuous resolution of N-acyl-DL-methionine; the operational stability of immobilized enzyme was also investigated.
文摘利用硫酸水解稻壳中的木聚糖,水解条件为硫酸质量分数1.2%,料液比1∶8,水解时间120 min,水解温度123℃,经一系列后续分离纯化工序,制备的D-木糖产品得率为7.14%。采用高效液相色谱面积归一法测定木糖产品中的木糖含量:以超纯水为流动相,采用Phynomenex公司的Rezex系列Ca2+型糖醇柱(带保护柱)作分离柱,选用示差折光检测器,控制分离温度75℃,分离流速0.6 m L/min,对木糖产品进行测定,其纯度为99.95%。
