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Pulsed coulometric detection of carbohydrates at a constant detection potential at gold electrodes in alkaline media

✍ Scribed by Glen G Neuburger; Dennis C Johnson

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
595 KB
Volume
192
Category
Article
ISSN
0003-2670

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✦ Synopsis

A significant increase in the signal-to-noise ratio for the pulsed amperometric detection (PAD) of carbohydrates at gold electrodes is obtained by increasing the length of the current integration period (ti) from the traditional value of 16.7 ms (i.e., l/60 Hz). For t, is 16.7 ms, the integrated response (q, coulombs) is plotted as the signal. This pulsed coulometric detection (PCD) is applied in a flow-injection system. For ti = 500 ms, the detection limit with the instrumentation used is 1 PM (S/N = 2) for glucose which is a significant improvement on the value 35 PM found with PAD. The absolute detection limits for glucose and sucrose are ca. 50 pmol and 125 pmol, respectively, in 50#1 samples. Calibration plots (qp vs. Cb) for PCD are linear over significantly larger dynamic ranges than those observed for PAD because of the lower detection limits.

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