Abstract − Analytical Sciences, 19(12), 1671 (2003).
Electrocatalytic Determination of L-Ascorbic Acid by Modified Glassy Carbon with Ni(Me2(CH3CO)2[14]tetraenoN4) Complex
Mozhgan KHORASANI-MOTLAGH* and Meissam NOROOZIFAR**
*Inorganic Research Laboratory, Department of Chemistry, Sistan & Baluchestan University, P. O. Box 98165-181, Zahedan, Iran
**Analytical Research Laboratory, Department of Chemistry, Sistan & Baluchestan University, Zahedan, Iran
**Analytical Research Laboratory, Department of Chemistry, Sistan & Baluchestan University, Zahedan, Iran
A novel modified glassy carbon electrode containing Ni(Me2(CH3CO)2[14]tetraenoN4) complex was used as an electrocatalytic sensor for the determination of L-ascorbic acid in pH = 6.6. The peak potential shifted to negative by 205 mV compared with that for a bare electrode in cyclic voltammograms. The calibration curve was linear up to 6.2 x 10-3 M with a detection limit 3.1 x 10-7 M and an RSD% better than 2.47%. This newly modified electrode was applied to commercial pharmaceutical tablets, injections and foods. The obtained results were identical to those obtained by the classical 2,6-dichlorophenolindophenol method.
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