Analysis of triazine herbicides and huna-lian by capillary electrophoresis sequential mass spectrometer. Unknown peaks caused by adding the cyclodextrin to the running buffer.
| Autor: | Chen, Yet-Ran, 陳逸然 |
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| Rok vydání: | 1998 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 86 Capillary Electrophoresis (CE) in combination with sequential mass spectrometr y such as MS/MS/MS, proved to be an ideal technique to the analysis of complex mixtures. Triazine herbicides and Chinese medicine fortified with coptisine, palmatine, berberine HCl were studied by CE/MSn. The result showed that more reliable identification could be achieved in comparison with CE/MS.In the ana lysis of ganglioside mixture by CE/UV, peaks not related to gangliosides were observed. The intensities of these peaks were found to be inverse proportiona l to the concentration of alpha- beta- gamma- CDs in sample zone; negative peaks were observed when the CD concentrations in sample zone were larger tha n the buffer zone. Due to the concentrations of hydroxide ion, absorbance at 200nm increased as buffer pH increased. It is found that hydroxide ion has higher absorptivity then neutral CDs. This observation leads to the speculati on that CD peaks, whether they are positive or negative, are resulting from th e replacement of hydroxide ion with CDs. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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