Several column chromatographic methods are available for the separation of aflatoxins (l-6). Most of these procedures are elaborate and involve several steps of purification. A rapid and simple method of obtaining pure aflatoxins was reported by Steyn (5); however, with this method, we were not able to obtain pure crystalline aflatoxins B, and G1 for our experimental studies on animals. When pu...

The optimum parameters of extraction for glycoprotein from seahorse were examined and determined by Box-Behnken combined with ultrasonic extraction technology. Column chromatography of glycoprotein was used for further purification. The optimal extraction conditions of seahorse glycoprotein were extracting time 4.3 h, salt concentration 0.08 mol/L, extracting temperature 73°C, raw material, and...

Abstract A diverse range of ureas, N-acylureas, carbamates, and thiocarbamates has been synthesized in good to excellent yields by reacting N-acylbenzotriazoles individually with amines or amides phenols thiols the presence diphenylphosphoryl azide (DPPA) as a suitable donor anhydrous toluene at 110 °C for 3–4 hours. In this route, DPPA was found be alternative trimethylsilyl sodium Curtius deg...

kinetic parameters of the ammonolysis reaction of dichloroethane in nonaqueous media are studied and the optimum reaction conditions are reported. a suitable reactor for running the reaction under high pressure in the range of 50 to 500 °c is designed. kinetic behaviours of the system is studied and other reaction parameters such as rate constant, kinetic order, and activation energy are determ...

Injectors/Autosamplers 2815 Temperature Effects In LC 2815 Sample Preparation/Derivatization 2816 Microchip Technology in LC 2816 Automation 2817 Other Articles of Interest 2817 Columns 2817 Reviews 2817 Columns Materials, Effects, and Packing 2817 Supports 2817 Stationary Phases 2818 Ion-Exchange Phases 2819 Monolithic Columns 2819 Molecular Imprinted Polymer (MIP) Phases 2819 Tunable Stationa...

Background and objectives: The aerial parts of Echinophora platyloba are added to cheese and yoghurt for flavoring. Besides, it is used for the treatment of flatulence and as air freshener. Despite several pharmacological studies on the plant, no attempt has been made to isolate non-volatile secondary metabolites from this plant. So, phytochemical investigation seems t...

Mercurated dextran (polysaccharide) was found to fractionate mononucleotides according to their affinity for organomercurial Hg(+). The nucleotides are released from the chromatographic column in the sequence CMP, AMP, GMP, and TMP when borate buffer of increasing pH is used as an eluent.