Fast Analysis of Caffeic Acid-Related Molecules in Instant Coffee by Reusable Sonogel-Carbon Electrodes

Reusable Sonogel-Carbon electrodes containing carbon black (SNGC-CB) have been used for the electrochemical analysis of caffeic acid (CA) in real matrices. Measurements were firstly performed in standard solutions, in which SNGC-CB electrodes allowed the electrochemical determination of CA with high sensitivity and low limit of detection, equal to 0.76 mu M. The presence of CB nanostructures in the formulation led to improved performances with respect to pristine SNGC electrodes. Then, measurements were performed in four instant coffees of different brands. A comparison between the results obtained by electrochemical, chromatographic and spectroscopic methods showed that SBGC-CB electrodes represent a simple and economic tool for the rapid assessment of caffeic acid-related molecules in instant coffees.

Automated summary

Reusable Sonogel-Carbon electrodes with carbon black were used for electrochemical analysis of caffeic acid in standard solutions and instant coffees, showing high sensitivity and low detection limit. The inclusion of CB nanostructures improved performance compared to pristine SNGC electrodes. SBGC-CB electrodes proved to be a simple and cost-effective tool for rapid assessment of caffeic acid-related molecules in instant coffees through comparison with electrochemical, chromatographic, and spectroscopic methods.