Sökning: "Column switching"
Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Column switching.
1. Quantitative Bioanalysis : Liquid separations coupled to targeted mass spectrometric measurements of bioactive compounds
Sammanfattning : Performing quantitative analysis of targeted bioactive compounds in biological samples, such as blood plasma, cerebrospinal fluid or extracts from pig liver, put high demands on the ruggedness of the method acquiring the results. In addition to the complexity of the sample matrix, the bioactive compounds targeted for analysis usually have low levels of natural abundance, further increasing the demand on the analytical method sensitivity. LÄS MER
2. Organic acids and siderophores in forest soil solution
Sammanfattning : .... LÄS MER
3. Direct injection of plasma samples into restricted-access media precolumns for drug analysis in column-switching systems
Sammanfattning : This thesis focuses on the theoretical and practical aspects of using column-switching systems for direct injection of plasma samples to assay drugs at ng/ml levels. The systems utilized a restricted-access media (RAM) precolumn for the sample clean-up and trace enrichment. LÄS MER
4. Cold trapping and reinjection techniques for gas chromatography-mass spectrometry
Sammanfattning : This thesis describes the use of cold trapping and reinjection techniques in combination with gas chromatography-mass spectrometry. A summary of different cold trap/ reinjection systems is presented. LÄS MER
5. Development of techniques and methods for drug analysis by packed capillary liquid chromatography with octadecylbonded silica and porous graphitic carbon columns
Sammanfattning : Packed capillary liquid chromatography in combination with ultraviolet and mass spectrometric (MS) detection was explored as an analytical tool for drug analysis. The focus was put on column and sample preparation techniques as well as on fundamental aspects and development of chromatographic separations. LÄS MER