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Electrochemical Behaviour of Baicalin at Nano MnO2-Ionic Liquid Modified Electrode and Its Electroanalytical Application |
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DOI:10.3969/j.issn.1004-4957.年份.月份 |
KeyWord:[BMIM]PF6 nano MnO2 baicalin cyclic voltammetry differential pulse voltammetry |
Author | Institution |
LIU Zhimin,CAO Yanyan,HUANG Baisheng |
河南工业大学化学化工学院 |
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Abstract: |
A new [BMIM]PF6-MnO2-CHIT/GCE modified electrode was fabricated via the chitosan(CHIT) filming using hydrophobic ionic liquid 1 butyl 3 methylimidazolium hexafluorophosphate([BMIM]PF6) and nano MnO2 as modifiers.In Britton-Robinson(B-R) buffer,the electrochemical behavior of baicalin at [BMIM]PF6-MnO2-CHIT/GCE was studied,and a new method for the determination of baicalin in radix scutellariae was developed.The cyclic voltammetry curves of baicalin at [BMIM]PF6-MnO2-CHIT/GCE presented a pair of sensitive and reversible redox peaks.The peak current responsed at the proposed electrode was enhanced 26 folds higher than that at the MnO2-CHIT/GCE,and the peak potential difference was 0062 V,the electron transfer rate constant ks was 0258 s-1.The change of the oxidation peak current with baicalin concentration at [BMIM]PF6-MnO2-CHIT/GCE was examined by differential pulse voltammetry.The calibration curve was linear in the concentration range of 10×10-9-10×10-5 mol/L with a detection limit(S/N=3) of 10×10-10 mol/L.The relative standard deviation(n=5) of 10×10-8 mol/L baicalin was 21%.The method was applied in the determination of baicalin in samples with satisfactory results,and the spiked recoveries were in the range of 95%-103%. |
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