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PubMed1979

[Chromatography of membrane proteins in Triton-X 100. II) Affinity chromatography of membrane proteins on Con-A linked to Sepharose in Triton-X 100].

The Authors have made chromatographs using Con-A Sefaroso columns, varying the percent of Triton-X 100 and the proteic concentration. With proteic concentrations varying from 0.4 to 4mg/ml and in solutions containing 0.5 to 1% of Triton-X 100 with the pH value remaining constant at 8 - solubilization of membrane protein does occur.

Animals↗
PubMed1984

Stabilized analysis of antidepressant drugs by solvent-recycled liquid chromatography: procedure and proposed resolution mechanisms for chromatography.

In this efficient extraction and isocratic liquid-chromatographic procedure for measuring eight antidepressant drugs in serum (amoxapine, 8-hydroxyamoxapine, doxepin, desmethyldoxepin, imipramine, desipramine, amitriptyline, and nortriptyline), they are extracted from serum as a group by use of disposable solid-phase cyanopropyl columns; the eluate is injected directly onto a Zorbax cyanopropyl analytical column. This sample preparation circumvents potential problems of drug instability associated with the usual evaporating/concentrating techniques. Recycling the acetic acid/acetonitrile/n-butylamine mobile phase not only maintains a stable, cost-effective system, it also prolongs column life. Standard curves for all eight drugs are linear to 1000 micrograms/L; the detection limit is 8-10 micrograms/L. For all drugs and metabolites, within-run CVs were 0.9 to 2.2%, between-run CVs 2.1 to 3.8%. Analytical recovery of the solid-phase extraction step was 85 to 100% (mean = 94.5%) for all analytes. Standards and controls, stored frozen in drug-free serum, are stable for at least six months. We also report a study of separation mechanisms.

Antidepressive Agents, Tricyclic↗