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A rapid and sensitive method is described for the detection of melatonin in rat pineal gland and melatonin tablets. Capillary electrophoresis (CE) with electrochemical detection (EC) was used. This method had high sensitivity and good reproducibility. The detection limit of melatonin was as low as 1.3x10 -9 mol/l (0.30 fg). There was a linear range of concentration from 3.9x10 - ...
A new electrochemical cell assembly with the combination of UV and amperometric detector (AD) based on their complementarity was described. A Nafion tubing junction was used to decouple the high voltage from the separation capillary in the rear of on-column UV detector. In this mode, the electroactive and inert compounds could be detected by UV and AD at the same time. Aromatic amines were determined...
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