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Electrochemical Study on the Interaction of Bilirubin with Europium Ions in Aqueous Media
Author(s) -
Zhuang Qiankun,
Dai Huaicheng,
Liu Hong
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199912)11:18<1368::aid-elan1368>3.0.co;2-7
Subject(s) - europium , chemistry , aqueous solution , electrochemistry , inorganic chemistry , ion , bilirubin , mercury (programming language) , dropping mercury electrode , buffer solution , electrode , organic chemistry , medicine , gastroenterology , computer science , programming language
The interaction of bilirubin (BR) with europium ions was studied at mercury electrode by cyclic voltammetric and chronocoulometric methods in Tris buffer solution (pH 8.0). Bilirubin was strongly adsorbed at the mercury electrode with a two‐electron irreversible reduction peak at about –1.30 V (vs. Ag/AgCl). After adding europium ions into the bilirubin solution, the reduction peak current of BR decreased proportionally to the concentration of the europium ions. A complex such as Eu 3+ ‐BR which could not be reduced before –1.5 V (vs. Ag/AgCl) would be formed. With the help of IR and UV‐visible spectral experiments, the structural formula of the complex has been proposed.