Differential pulse voltammetry for the simultaneous determination of the α-mangostin and γ-mangostin
Electrochemical behavior of α-mangostin and γ-mangostin on a glassy carbon disk electrode was studied through investigation of the effect of pH, quit time etc. A novel differential pulse voltammetry (DPV) for the simultaneous determination of α-mangostin and γ-mangostin in the mixture was established. In Britton-Robinson buffer (pH 3.1), α-mangostin and γ-mangostin can be oxidized on the electrode to produce oxidative peaks at the potentials of 0.822 V and 0.426 V (vs SCE) respectively. The corresponding peak currents are proportional to the concentration within 5.00×10~(-6)～2.00×10~(-4) mol/L for α-mangostin and within 2.00×10~(-5)～6.00×10~(-4) mol/L for γ-mangostin respectively. The linear correlation coefficients are 0.9950 and 0.9904 for α-mangostin and γ-mangostin respectively. The RSDs are 3.3% and 4.1% (n=10) for 2.00×10~(-4) mol/L α-mangostin and γ-mangostin separately.
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维普
