A.C.polarography of thiamine hydrochloride in weakly acidic buffer solutions

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<jats:title>Abstract</jats:title> <jats:p>Although in ordinary D. C. polarography no well-defined polarographic reduction waves of thiamine in weakly acidic or in neutral buffer solutions have been reported, it was found that A. C. polarographic methods would be suitable for these studies.</jats:p> <jats:p>A. C. polarographic waves of thiamine appeared at 1.27∼−1.35 V. in buffer solutions of pH 3.0∼4.75, and in the region of pH 4.75∼7.0 a new wave began to be observed at more positive potentials than −1.27∼1.35 V., while another wave was observed at −1.32∼−1.44 V. in the same pH region. The heights of two waves decreased with the increase of pH.</jats:p> <jats:p>In basic buffer solutions the wave forms varied irregularly and the waves disappeared completely at pH 10.0.</jats:p> <jats:p>According to the relation of is to temperature, mercury heights and concentrations, these two waves were both recognized as diffusion currents with a few tensammetric properties.</jats:p> <jats:p>The nature of the first and second waves were attributed to the reductions of thiamine with Cl−, and with hydrochloric acid and Cl− to each dihydrothiamine, respectively.</jats:p>

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