Adsorption and reduction of berberine at a mercury electrode (CROSBI ID 86247)
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Podaci o odgovornosti
Komorsky-Lovrić, Šebojka
engleski
Adsorption and reduction of berberine at a mercury electrode
Adsorption and reduction of berberine are investigated by alternating current polarography and square-wave voltammetry in electrolytes of various pH. Both berberine and the product of its reduction canadine form condensed films on the mercury electrode surface. These processes limit the analytical application of square-wave voltammetry combined with adsorptive accumulation of berberine. Reduction of berberine is totally irreversible and occurs between - 0.95 V and - 1.35 V, depending on berberine concentration and pH of solution. Canadine is electroinactive and can not be reoxidized on mercury electrode. Its condensed film is very stable, even at - 0.5 V, and may prevent adsorption of berberine. The properties of square-wave voltammetric responses of berberine in acidic, neutral and basic electrolytes are reported and the conditions for their electroanalytical application are discussed.
berberine; canadine; tensametry; condensed film; square-wave voltammetry; adsorption
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Podaci o izdanju
12 (8)
2000.
599-604
objavljeno
1040-0397
1521-4109
10.1002/(SICI)1521-4109(200005)12:8<599::AID-ELAN599>3.0.CO;2-U