Study on the polarographic prewave of Co(II) with tryptophan

Abstract

A new polarog. prewave of Co(II) with tryptophan (Trp) in borate buffer (pH = 9) is reported. The adsorption characteristics of tryptophan and its complex Co(II)-Trp, which was formed at the surface of static mercury drop electrode were investigated. The complex has a composition of 1:1 and corresponds to a prewave, while another complex of composition 1:2 may be formed at a more neg. potential than the reduction potential of the hydrated Co(II) ion. By the method of double-step chronocoulometry, the area of the adsorbed 1:1 complex was found to be 0.97 nm2.

Key words: TRYPTOPHAN, ELECTRODE, REACTION MECHANISM, FORMATION, BORIC ACID, POLAROGRAPHIC ANALYSIS, COBALT COMPLEX, CATALYTIC WAVE, SODIUM HYDROXIDE, REDUCTION PROCESS

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LI LING;GAO XIAOXIA. Study on the polarographic prewave of Co(II) with tryptophan[J]. Acta Chimica Sinica, 1992, 50(1): 39-43.

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