Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7139474 | Sensors and Actuators B: Chemical | 2018 | 36 Pages |
Abstract
The novel 7-propinyloxy-3-(p-propinyloxyphenyl) coumarin having terminal ethynyl groups was synthesized for the first time. This coumarin has been successfully bounded covalently to single walled carbon nanotubes (SWCNTs) via the azide-alkyne Huisgen cycloaddition (Click) reaction for the preparation of a 3D hybrid material. Glassy carbon electrode was modified with the 3D SWCNTs-coumarin hybrid material for the determination of quercetin antioxidant. The proposed modified electrode is nearly 10-fold more sensitive than the bare electrode by applying the differential pulse stripping voltammetry (DPSV). In addition, the parameters of DPSV measurements such as accumulation time, accumulation potential and pH were optimized as 20â¯s, 200â¯mV and pH 2 Britton-Robinson buffer solutions in 1â¯Î¼M quercetin, respectively. In the optimized conditions, the linear working range from 0.25 to 3â¯Î¼M was determined. The detection and quantification limits of quercetin were found to be 20â¯nM and 66â¯nM by DPSV on the modified electrode, respectively. The DPSV procedure was also applied to test different brand tea real samples and quercetin was determined by a standard addition method with the recovery between 97.00 and 103.10.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ahmet Åenocak, Baybars Köksoy, Erhan DemirbaÅ, Tamara Basova, Mahmut DurmuÅ,