A glassy-carbon electrode modified by dispersed alpha-alumina as an enhanced electrochemical detector in liquid chromatography for cysteine and glutathione.
The dispersion of alumina particles on a glassy-carbon surface serving as a modified electrode significantly enhances the amperometric detection of cysteine and glutathione following liquid chromatography. With an applied potential of 0.8 V vs. SCE, the detection limits were 1.2 ng for cysteine and 8 ng for glutathione and the electrode response was linear up to 600 ng for cysteine and 1.8 mug for glutathione. The modified electrode displayed high sensitivity and stability and was easy and inexpensive to prepare.
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