Ionic Organic Film Sensor for Determination of Phenolic Compounds

This paper describes the development of a new sensor based on an ionic organic film. The amphiphilic molecule, 4‐[(4‐decyloxyphenyl)‐ethynyl]‐1‐methylpyridinium iodide (10PyI), which has liquid‐crystalline properties, was synthesized and applied in the construction of a GCE/10PyI sensor. Analytical parameters for caffeic acid, repeatability (4.8 %), reproducibility (2.8 %), linearity (two ranges: 9.9×10 −7 to 3.8×10 −5 mol L −1 and 4.7×10 −5 to 9.9×10 −5 mol L −1 ) and detection limits (9.0×10 −7 mol L −1 and 8.7×10 −6 mol L −1 ), were determined. The method was successfully applied in the determination of total phenolic compounds (TPC) in mate herb extracts.