Abstract
Abstract γ-Pyronyl-triterpenoid saponin (chromosaponin I; CSI) isolated from pea is strongly adsorbed at a glassy-carbon electrode, and gives an irreversible oxidation wave at 0.4 V vs. Ag/AgCl. The γ-pyronyl moiety is responsible for the electroactivity. CSI can reduce 1,4-benzoquinone, some of its derivatives and also cytochrome c. From comparison with other reductants, the formal redox potential of CSI was estimated to be 0.3–0.4 V vs. NHE (pH 7.0).
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