Electrochemical reduction of coumarins at a film-modified electrode and determination of their levels in essential oils and traditional Chinese herbal medicines.
The electrochemical reduction of coumarins on glassy carbon and electrodeposited metal electrodes was investigated in a Britton-Robinson buffer (pH 1.87-11.98). The effects of various factors, such as the deposition material, time, and concentration of mercury, on the precision of the analysis were explored. The possible reaction mechanism of the reduction process with regards to scan rates, peak potentials, and currents is discussed. Electroreduction was used to quantitatively determine the levels of coumarins in some essential oils and traditional Chinese herbal medicines. A comparison with high performance liquid chromatography analysis results shows good agreement.
Wang
Lai-Hao
LH
Department of Applied Chemistry, Chia Nan University of Pharmacy and Science, Jen Te, Tainan 71743, Taiwan. e201466wang@msa.hinet.net
Liu
Hsiu-Hua
HH
D002244:Carbon / Q000737:chemistry; D003374:Coumarins / Q000032:analysis* / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D004560:Electricity; D055664:Electrochemical Techniques; D004563:Electrochemistry; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008516:Medicine, Chinese Traditional; D008628:Mercury / Q000737:chemistry; D009822:Oils, Volatile / Q000737:chemistry*; D010084:Oxidation-Reduction; D015203:Reproducibility of Results
D003374:Coumarins; D004365:Drugs, Chinese Herbal; D004573:Electrolytes; D009822:Oils, Volatile; D002244:Carbon; D008628:Mercury