The characterization of all components of pharmaceutical preparations, especially in the analysis of impurities present at levels higher than 0.05% of the main component, is a challenge in the pharmaceutical industry because no single detector can detect all impurities present. All commercial detection methods suffer from certain disadvantages. Universal sensitive detection with a wide dynamic range is strongly demanded. This results in an increasing interest in the development of universal sensitive detection methods for the pharmaceutical industry, which was the goal of this project. In this project, universal detection of analytes by HPLC-FID coupling was explored. Due to the large volume of the vapours of the mobile phase in HPLC, flame-based detection systems are prone to flame instability. To overcome this problem, a series of improvements were evaluated: 1) a fraction of the total volume of the effluent was delivered to the flame of the FID in a split mode; 2) a tubular oven was used before the FID to preheat the effluent and remove a large fraction of the mobile phase before the detector; 3) oxygen gas and a modified FID with an elongated burner were used to improve the performance of the FID. Finally, optimization of the FID design and parameters was performed by running a series of tests in flow injection mode using simplex optimization method.

The objective of this study is to quantify the polycyclic aromatic hydrocarbons (PAHs) of the sediments along the coast of south-western Taiwan and to investigate possible sources. The south-western coastal area is full of heavy industries. There are tens of industrial parks along with export processing zone, steel-making plant, oil refinery, shipbuilding plant, Hsin-ta pelagic fishing port, Hsin-ta thermal power plant and Kaohsiung international port. It is reasonable that the wastewater went into rivers or pipes and eventually enters coast area. Concentrations of total polycyclic aromatic hydrocarbons (PAHs) in the sediments of south-western Taiwan were between 197.3~2498.9 (ng/g ¡Vdw) with the average of 912.0 (ng/g ¡V dw). Among all stations sampled in this study, A3, located at the waterway of Kaohsiung, has the highest value. The wastewater ejected by ships might be the major factor. The second highest value we got is from C2, which located at the area farer from shoreline than A3. Total organic carbon (TOC) versus median particle size has linear relationship, however, total organic carbon (TOC) versus concentrations of polycyclic aromatic hydrocarbons (PAHs) showed no linear relationship. This is probably due to the wide sampling area of this study and sources of polycyclic aromatic hydrocarbons (PAHs) were not the same. Principal component analysis shows three principal components were extracted and up to 78.79% of total variance can be explained. As indicated on rotated loadings, the three major components were characterized by 4-6 rings PAH compounds, 3-4 rings PAH compounds and 2-5 rings PAHs compounds, respectively. Results of Hierachical cluster analysis also show three major groups (Group 1, 2 and 3) can be geographically related. In addition, according to isomer ratios of PAH compounds, pollution sources of each group can be specified. Group 1, stations located northern bound, has mainly pyrogenic pollution sources, while Group2, stations located at central area of this study, has pyrogenic/petrogenic sources. For Group 3, stations located southern bound, was mainly polluted by petroleum. In regards to the sediment quality guidelines, ERL and ERM, there are one third of stations exceed ERL regarding to Acp and Phe, but only station A3 exceeds ERL regarding to F1 and Pyr.

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Würzburg, Universität, Thesis (doctoral), 2001.

The characterization of all components of pharmaceutical preparations, especially in the analysis of impurities present at levels higher than 0.05% of the main component, is a challenge in the pharmaceutical industry because no single detector can detect all impurities present. All commercial detection methods suffer from certain disadvantages. Universal sensitive detection with a wide dynamic range is strongly demanded. This results in an increasing interest in the development of universal sensitive detection methods for the pharmaceutical industry, which was the goal of this project. In this project, universal detection of analytes by HPLC-FID coupling was explored. Due to the large volume of the vapours of the mobile phase in HPLC, flame-based detection systems are prone to flame instability. To overcome this problem, a series of improvements were evaluated: 1) a fraction of the total volume of the effluent was delivered to the flame of the FID in a split mode; 2) a tubular oven was used before the FID to preheat the effluent and remove a large fraction of the mobile phase before the detector; 3) oxygen gas and a modified FID with an elongated burner were used to improve the performance of the FID. Finally, optimization of the FID design and parameters was performed by running a series of tests in flow injection mode using simplex optimization method.

Diss. (sammanfattning) Uppsala : Uppsala universitet, 2005. / Härtill 6 uppsatser.

Ulm, Univ., Diss., 2008.

Univ., Diss.--Würzburg, 1996.