Electrochemical determination of plant-derived leuco-indigo after chemical reduction by glucose


Vuorema, A., John, P., Keskitalo, M. and Marken, F., 2008. Electrochemical determination of plant-derived leuco-indigo after chemical reduction by glucose. Journal of Applied Electrochemistry, 38 (12), pp. 1683-1690.

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Electrochemical determination of redox active dye species is demonstrated in indigo samples contaminated with high levels of organic and inorganic impurities. The use of a hydrodynamic electrode system based on a vibrating probe (250 Hz, 200 mu m lateral amplitude) allows time-independent diffusion controlled signals to be enhanced and reliable concentration data to be obtained under steady state conditions at relatively fast scan rates up to 4 V s-1In this work the indigo content of a complex plant-derived indigo sample (dye content typically 30%) is determined after indigo is reduced by addition of glucose in aqueous 0.2 M NaOH. The soluble leuco-indigo is measured by its oxidation response at a vibrating electrode. The vibrating electrode, which consisted of a laterally vibrating 500 mu m diameter gold disc, is calibrated with Fe(CN)(6) 3-/4- in 0.1 M KCl and employed for indigo determination at 55, 65, and 75 C in 0.2 M NaOH. Determinations of the indigo content of 25 different samples of plant-derived indigo are compared with those obtained by conventional spectrophotometry. This comparison suggests a significant improvement by the electrochemical method, which appears to be less sensitive to impurities.


Item Type Articles
CreatorsVuorema, A., John, P., Keskitalo, M. and Marken, F.
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DepartmentsFaculty of Science > Chemistry
ID Code12076
Additional InformationID number: 000260689500008


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