A new frontal electroelution approach that can be used for the preconcentration of amino acids in in-line solid-phase extraction-capillary electrophoresis (SPE-CE) has been developed. A single capillary was employed featuring a short monolithic SPE column created inside the capillary via photo-initiated, free-radical polymerisation of 3-sulfopropyl methacrylate and butyl methacrylate monomers. ...

method previously employed by westoo for the determination of alkylmercury compounds was producing very wide picks during g.c. analyses. changing the column temperature, carrier gas flow and pressure did not supersede the problem. therefore change in packing materials was experienced. 5% dc-200 on gas-chrom did not work. a packing material used for chlorinated hydrocarbons w, 80-100 mesh. as th...

anesthetic agent as well as lidocaine, bupivacaine and mepivacaine (Fig. 1). Unlike bupivacaine and mepivacaine, which are racemic mixtures of the enantiomers containing equal proportion of the (S) and (R) forms, ropivacaine is exclusively the (S)-enantiomer. Since the (R)-enantiomer in the racemic aminoamide has known to be toxic, ropivacaine potentially provides lower toxicity on heart and ce...

A column of alumina modified with sodium dodecyl sulfate (SDS) and dimethylglyoxime (DMG) was prepared for the preconcentration of trace nickel from water samples for flame atomic absorption spectrometry (FAAS) determinations. Under optimized conditions (pH=7.0; flow rate: 20 mlmin-1) nickel was retained on the column. The nickel collected on the column was eluted with 5 mL of 1 M nitric ac...

This article introduces the aptamer affinity column (AAC) with nucleic acid as an ligand for extraction of four aminoglycoside antibiotics (AGs). The AAC was prepared by loading functionalized Sepharose into column, which conjugated covalent binding between NHS-activated and amino-modified aptamers a coupling time 2 h. After sample solution flowed through AAC, AGs were retained because aptamer,...