The development of fluorometric methods (l-4) for the quantitative estimation of estrogens in the small quantities present in human urine has opened the way for improvements in the procedures utilized for the extraction and separation of these compounds. A study of the partition coefficients of estrone, estradiol-178,’ and estriol in various solvent systems has been of great value in the develo...

Wei Li1,2, Cheng Zheng3*, Jinshui Wang4, Youyuan Shao1, Yanxiang Gao2, Zhengxiang Ning4 and Yueming Jiang5 College of Biological Engineering, Hubei University of Technology, Wuhan 430068, PR China College of Food Science and Nutritional Engineering, China Agriculture University, Beijing 100083, PR China College of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510091, PR Ch...

Two-stage dilute acid pretreatment followed by enzymatic cellulose hydrolysis is an effective method for obtaining high sugar yields from wood residues such as softwood forest thinnings. In the first-stage hydrolysis step, most of the hemicellulose is solubilized using relatively mild conditions. The soluble hemicellulosic sugars are recovered from the hydrolysate slurry by washing with water. ...

Preparative HPLC 5}30 '20 2}20 0.01}1 High purity solvent required Higher resolution See also: II/Chromatography: Countercurrent Chromatography and High-Speed Countercurrent Chromatography: Instrumentation. Chromatography: Liquid: Countercurrent Liquid Chromatography. III/Alkaloids: Gas Chromatography; High-Speed Countercurrent Chromatography; Liquid Chromatography; Thin-Layer (Planar) Chromato...

The article discusses the possibility and efficiency of using discrete diffusion in extraction materials with an internal anisotropic structure comparison a continuous process. For this purpose, theoretical calculations were made experimental studies countercurrent pectin from Jerusalem artichoke carried out. To carry out simulation, equation for calculating coefficient adsorption isotherm duri...