凝胶渗透色谱法测定水溶性木质素磺酸盐的分子量

木质素磺酸盐是以木材为原料酸法制浆造纸工业的副产物,广泛用作分散剂、粘合剂等。由于它是以苯丙烷为结构单元的水溶性高分子化合物,其分子量的测定有Sephadex凝胶法和用BioGel P、TSK PW、Waters Ⅰ系列、Waters μPorasil等柱     

气相色谱法测定亚硫酸盐废液发酵过程中的醋酸、糠醛和乙醇

发酵亚硫酸盐废液中的单糖制酒精的过程中,抑制剂醋酸和糠醛[1]及产物乙醇的测定是发酵研究的重要方面。文献中用气相色谱法测定水溶液中的脂肪酸[2,3]、亚硫酸废液中的糠醛[4]及同时测定发酵液中的脂肪酸和乙醇[5—7]的报道虽然很多,但有的是用溶剂萃取法[2,4],有的是用程序升温法,     

植物单糖的高效液相色谱分析

Monosaccharides, including glucose,xylose,galactose,arabinose and mannose,are structure units ofplant cellulose and hemicellulose, Optimal separation of them was achieved by a Bio- Rad Aminex HPX-87Pcolumn at 85℃ eluted with degassed water at 0.6mL/min. Sample pretreatment was perfOrmed with lead ac-etate or lead nitrate, and no sugar Ioss was observed.Quantitative analysis was conducted with n- pentanol asthe internal standard Or with external standard method