Abstract
DL-Thioctic acid (α-lipoic acid) is adsorbed on a mercury electrode in the potential region more positive than ca. -0.4 V vs. SCE and yields a reduction peak at ca. -0.6 V. The adsorption of thioctic acid is employed in the preconcentration step of the stripping voltammetry of thioctic acid (adsorptive stripping voltammetry). From the fundamental studies it was found that in 0.1 M ammonium acetate the stripping peak height for thioctic acid was maximum. The optimal preconcentration potential, preconcentration time, scan rate and temperature are -0.2 V, 5 min, 50 mV/s and 25 °C, respectively. Under the optimum conditions described above, the calibration curve is linear up to 1.6 μM and the detection limit is 0.1 μM. Thioctic acid and riboflavin in milk were determined by this method.
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