engleski

Constant current chronopotentiometric stripping of sulphated polysaccharides

We show that electrochemically inactive molecules of polysaccharide (PS), if carrying sulphated groups (e.g. i-carrageenan and dextran sulphate) produce in buffered solutions two well-developed chronopotentiometric peaks HPS and H0PS (due to catalytic hydrogen evolution) at hanging mercury drop electrode.Peak HPS of i-carrageenan displayed a striking increase at negative accumulation potentials, which was tentatively explained by uncoiling the PS double-helical structure at these potentials. Nanomolar concentrations of i-carrageenan can be determined at moderate accumulation times.

Sulphated polysaccharides; i-Carrageenan; Catalysis of hydrogen evolution; Constant current chronopotentiometric stripping; Mercury electrode

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