NEW APPLIED METHOD FOR SIMULTANEOUS DETERMINATION OF ELLAGIC AND TANNIC ACID BY MULTI-WALL CARBON NANOTUBE PASTE ELECTRODE: APPLICATION IN QUANTIFICATION PUNICA GRANATUM AND QUERCUS INFECTORIA

作者：Ghoreishi S M^*; Behpour M; Khayatkashani M; Motaghedifard M H

来源：Digest Journal of Nanomaterials and Biostructures, 2011, 6(2): 625-635.

• Ellagic acid
• Tannic acid
• Punica granatum
• Quercus infectoria
• Multi-wall carbon nanotubes
• Voltammetry

We investigated the electrochemical properties of ellagic acid (EA) and tannic acid (TA) by using a bare and modified carbon paste electrode containing multi-wall carbon nanotubes (MWCNTs). Voltammetric methods including cyclic voltammetry, chronocoulometry, linear sweep voltammetry, anodic stripping differential pulse voltammetry and hydrodynamic voltammetry were used. Cyclic voltammetry was used to investigate the redox properties of the modified electrode at various scan rates. Electrochemical parameters including the diffusion coefficient (D), the electron transfer coefficient (alpha), the ionic exchanging current density (i(o)) and the redox reaction rate constant (k) were determined for the oxidation of EA and TA on the surface of our modified electrodes. High dynamic ranges and low detection limits were obtained for both compounds. The peak current increased linearly with the concentration of EA and TA. The detection limits for EA and TA in the anodic stripping differential pulse voltammetry experiments were estimated to be 2.1x10(-10) and 6.7x10(-10) M, respectively, over the 180 second accumulation times of the open circuit potential. The modified electrode was then successfully used to determine the concentration of EA and TA in punica granatum and in the galls of Quercus infectoria.

• 出版日期2011-6