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- W1979603513 abstract "The catalytic nickel prewave produced by Cys-Gly, Cys-Tyr and Cys-Phe was studied in acetate buffer at pH 4–6.5. These peptides are more active than cysteine, especially the last two. The catalytic activity is depressed by decrease of pH owing to protonation of the catalyst. However, Cys-Phe and Cys-Tyr are still active at pH < 5, in contrast to Cys-Gly and Cys. This difference is accounted for by the interaction of the aromatic ring with the electrode surface at potentials more positive than the potential of zero-charge. This effect enhances the surface concentration of the catalyst in the case of Cys-Phe or Cys-Tyr. At pH < 5, a catalyst concentration ⩽ 10−5M and large excess of nickel, the current is controlled by the rate of accumulation of catalyst in the adsorbed state. Under these conditions the reducible complex is a 1:1 Ni2+-catalyst chelate. The catalytic wave recorded at pH 4.8 allows the determination of Cys-Phe or Cys-Tyr (10−6−10−4M) in the presence of the constituent amino-acids." @default.
- W1979603513 created "2016-06-24" @default.
- W1979603513 creator A5032176403 @default.
- W1979603513 date "1985-12-01" @default.
- W1979603513 modified "2023-10-18" @default.
- W1979603513 title "Polarographic catalytic nickel prewave induced by some cysteine-containing dipeptides" @default.
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- W1979603513 doi "https://doi.org/10.1016/0039-9140(85)80240-x" @default.
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