Voltammetry behavior of ursolic acid dissolved in a NaAc-HAc buffer was investigated by cyclic voltammetry(CV)and differential pulse stripping voltammetry(DPSV).It was found that the process at the hanging mercury electrode was preconcentration controlled;the reaction was irreversible and involved a change of one proton and a transfer of one electron.Under optimized experimental conditions,ursolic acid was detected in a concentration range from 0.5to 9.0pg·mL-1 with limit of detection of 0.17pg·mL-1(S/N=3).The developed DPSV method was then applied for the determination of ursolic acid in Chinse Traditional medicine samples,which in turn achieved a satisfactory percentage RSD compared with the alternative HPLC method.
Ursolic acidelectrochemical behaviordifferential pulse stripping voltammetryChinese traditional medicines
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