Naphthoquinones Nicotinamide

Naphthoquinone diazides 32, 284ff., see also Quinone diazides 2,3-Naphthotriazole, formation 132 f. Negations, psycholinguistics of 215 Nesmeyanov reactions 273 ff. Nicotinamide-adenine nucleotide (NAD+) 328 f. 

The classical dc polarography of vitamins A, B, B2, B6, BI2, and C, nicotinamide, tocopherols, and naphthoquinones has been reviewed [55]. Other studies have examined in detail the cyclic voltammetry of vitamin B12 employing rapid-scan voltammetry at the DME [90] and the HMDE [91]. Vitamin B12 is complexed with trivalent cobalt ion at the heterocyclic nitrogen atoms. As a result of the complexation, a catalytic hydrogen wave is formed for the compound. In addition to the catalytic wave, a wave corresponding to the reduction of the trivalent cobalt to the monovalent state is observed. 

K. Matsumoto, H. Ukeda, and Y. Osajima, Flow Injection Analysis of Reduced Nicotinamide Adenine Dinucleotide Using p-Naphthoquinone-4-Sulfonate as a Mediator. Agric. Biol. Chem., 48 (1984) 1879. 

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