Separation of cephalosporins on thin silica gel layers impregnated with transition metal ions and by reversed-phase TLC

Cephalosporin antibiotics were separated on thin layer plates impregnated with transition metal ions, Mn(2+), Fe(2+), Co(2+), Ni(2+) and Cu(2+), using different concentrations. Various solvent systems were developed for the study and were used for separation of these analytes. Impregnation was observed to have an effect on hR(F) values, removed tailing of analytes and improved the resolution. The results have been discussed for each metal ion and compared, and the best conditions of separation have been identified. Activation time of thin layer plates impregnated with 0.1% FeSO(4) was found to affect both hR(F) values and resolution of cephalosporins. New solvent systems are reported for both normal phase and reversed-phase TLC.     

Separation of oligogalacturonic acids by high-performance gel filtration chromatography on silica gel with diol radical.

Oligogalacturonic acids (OLGAs) ranging from two to nineteen residues in length were separated using high-performance gel filtration chromatography on a silica gel with diol radical. The optimum conditions (eluent, column temperature) for separation of OLGAs by high-performance gel filtration chromatography were investigated. The column used in this experiment allowed a high pressure of 4900 p.s.i. and a flow-rate of 2 ml/min. The stationary phase of silica gel stabilized the separation of OLGAs. The peaks of OLGAs separated using this column were assigned by comparing retention times with standards, and the molecular weights of the corresponding OLGAs were determined by fast atom bombardment mass spectrometry.