Simultaneous determination of geniposide and its metabolites genipin and genipinine in culture of Aspergillus niger by HPLC.
When cultivated with Aspergillus niger, geniposide, an important drug, is transformed into genipin and genipinine. A simple and rapid HPLC method for simultaneous determination of geniposide and its two metabolites in broth of A. niger is […]
Rapid screening of polysaccharide-based plasma volume expanders dextran and hydroxyethyl starch in human urine by liquid chromatography-tandem mass spectrometry.
The increasing number of samples and target substances in doping control requires continuously improved screening methods, combining high-throughput analysis, simplified sample preparation, robustness and reliability. Hence, a rapid screening procedure based on liquid chromatography-electrospray […]
Determination of oxatomide in human plasma by high-performance liquid chromatography-electrospray ionization mass spectrometry.
A rapid, sensitive and specific high-performance liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) method has been developed and validated for the determination of oxatomide in human plasma. Flunarizine hydrochloride was employed as the internal standard (IS). The analytes were chromatographically separated […]
HPLC-fluorescence assay for acyclovir in children.
A simple, accurate, reliable and sensitive HPLC method was developed and validated for quantitating acyclovir in human plasma. Sample (100 microL) preparation involved addition of guanosine (internal standard) and protein precipitation with 7% perchloric acid and centrifugation. Supernatant (20 microL) was injected onto a C(18) HPLC column […]
Determination of plasma topiramate concentration using LC-MS/MS for pharmacokinetic and bioequivalence studies in healthy Korean volunteers.
A rapid, simple and validated liquid chromatography coupled to tandem mass spectrometric method (LC-MS/MS) for topiramate analysis in human plasma has been applied to pharmacokinetic and bioequivalence studies in 24 healthy male Korean volunteers. The procedure involves […]
An optimal method of DNA silver staining in polyacrylamide gels.
DNA silver staining has widely been used to detect DNA fragments in polyacrylamide gels with high sensitivity. We developed an optimal method for DNA silver staining on polyacrylamide gels. The novel procedure can be completed within 10 min instead of over 20 min […]
Superiority of a new gradient system utilizing a critical threshold for the adsorption capacity of polypeptides to column packing when compared with a standard gradient system for the simultaneous and quantitative analysis of polypeptides.
Compared with a standard gradient system, the new gradient system which we developed has a major advantage because it […]
Expansion of mesenchymal stem cells using a microcarrier-based cultivation system: growth and metabolism.
For the continuous and fast expansion of mesenchymal stem cells (MSCs), microcarriers have gained increasing interest. The aim of this study was to evaluate the growth and metabolism profiles of MSCs, expanded in a microcarrier-based cultivation system. We investigated various […]
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