Effective screen-printed potentiometric devices modified with carbon nanotubes for the detection of chlorogenic acid: application to food quality monitoring |
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| Authors: | Hisham S M Abd-Rabboh Abd El-Galil E Amr Ahmed M Naglah Abdulrahman A Almehizia Ayman H Kamel |
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| Institution: | Chemistry Department, Faculty of Science, King Khalid University, Abha 61413 Saudi Arabia ; Department of Chemistry, Faculty of Science, Ain Shams University, Cairo 11566 Egypt.; Pharmaceutical Chemistry Department, Drug Exploration and Development Chair (DEDC), College of Pharmacy, King Saud University, Riyadh 11451 Saudi Arabia.; Applied Organic Chemistry Department, National Research Center, 12622 Dokki Giza Egypt ; Chemistry Department, College of Science, Sakheer 32038 Kingdom of Bahrain |
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| Abstract: | All-solid state screen-printed electrodes were fabricated for chlorogenic acid (CGA) detection. The screen-printed platforms were modified with multi-walled carbon nanotubes (MWCNTs) to work as a lipophilic solid-contact transducer. The sensing-membrane was plasticized with a suitable solvent mediator and incorporating NiII(bathophenanthroline)3]CGA]2 complex as a sensory material. In a 30 mM phosphate solution (buffer, pH 6), the sensor revealed a Nernstian-response towards CGA ions with a slope of −55.1 ± 1.1 (r2 = 0.9997) over the linear range 1.0 × 10−7 to 1.0 × 10−3 (0.035–354.31 μg mL−1) with a detection limit 7.0 × 10−8 M (24.8 ng mL−1). It revealed a stable potentiometric response with excellent reproducibility and enhanced selectivity over several common ions. Short-term potential stability and the interfacial sensor capacitance was estimated using both electrochemical-impedance spectroscopy (EIS) and chronopotentiometry techniques. The presented electrochemical platform revealed the merits of design simplicity, ease of miniaturization, good potential-stability, and cost-effectiveness. It is successfully applied to CGA determination in different coffee beans extracts and juice samples. The data obtained were compared with those obtained by liquid chromatography reference method (HPLC).All-solid state screen-printed electrodes were fabricated for chlorogenic acid (CGA) detection. |
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