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Differential-pulse polarographic study of nicotinamide adenine dinucleotide at a dropping mercury electrode

✍ Scribed by Weiyuan Zhu; Yingying Chen

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
417 KB
Volume
270
Category
Article
ISSN
0003-2670

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✦ Synopsis

Differential-pulse polarography was applied in studies of the polarographic behaviour of nicotinamide adenine dinucleotide (NAD+). The properties of the current of NAD + on a dropping mercury electrode are discussed and a CEC kinetic reduction process of NAD + on the electrode is proposed. It is recommended that the peak obtained under certain conditions could be used for the trace determination of this compound, with a detection limit of 5.0 x 10 -7 mol 1-1 in simple aqueous solution. In a solution containing 0.1 mol 1-1 malonic acid (pH 2.30), a hydrogen catalytic current is observed with a peak potential of -1166 mV (vs. SCE). The electrode reduction occurs after protonation but before charge transfer. NAD + acts as a catalyst in the process

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