New PDF release: Biological Electrochemistry

By Glenn Dryhurst (Auth.)

ISBN-10: 0122224019

ISBN-13: 9780122224010

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It was thus proposed that the failure to observe reduction peak ll c of ubiquinone-30 at slow sweep rates was due to formation of the Q H ~ species, according to the scheme just described and shown in Eq. (19), which upon reaction with tetraethylammonium perchlorate Q + e~ • Q^ H + > QH- QH- (from water) insoluble precipitate then forms a precipate on the electrode. The electrochemical reduction of ubiquinone-30 in acetonitrile in the presence of ethanol has also been studied briefly [84]. A cyclic voltammogram of ubiquinone-30 in a 1 :1 mixture of acetonitrile and ethanol is shown in Fig.

2 V. This potential is that of the more positive peak. The more negative peak was due to reduction of protons [82]. b Cr + e - ^ Q * * Peak II, (14b) Reduction peak ll c thus corresponded to a further 1e~ reduction of the radi2 cal anion (Q~) formed in the peak l c process to give a dianion (Q ~) [Eq. (14b)]. Peak ll a was proposed to represent the reverse reaction. However, it is clear from the data in Table VI that peaks ll c and ll a do not form a reversible couple. Addition of the weak acid diethyl malonate caused oxidation peak ll a to disappear and caused a shift of the peak potential for reduction peak ll c to more positive values (Table VI).

In addition, the polarographic diffusion current was linearly dependent on the concentration of ubiquinone-50 at a given concentration of sodium dodecyl sulfate, indicating that the observed wave must be due to electrochemical reduction of the ubiquinone-50. It appeared to be clear from the experimental results that the diffusing particle was a micelle of sodium dodecyl sulfate with ubiquinone-50. The diffusion coefficient of the latter micelle would be expected to depend on the size of the micelle formed and hence on the concentration of the sodium dodecyl sulfate.

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Biological Electrochemistry by Glenn Dryhurst (Auth.)


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