Laser-Induced Graphene Electrodes Modified with a Molecularly Imprinted Polymer for Detection of Tetracycline in Milk and Meat Abera, Biresaw D. Ortiz Gómez, Inmaculada Romero Maldonado, Francisco Javier Salinas Castillo, Alfonso Rivadeneyra Torres, Almudena Laser-induced graphene Antibiotic residue Tetracycline Molecularly imprinted polymer Milk Meat Flexible Electrochemical sensor This work was partially supported by the Italian Institute of Technology (IIT). We would like to express our gratitude to R. Cingolani and his group at IIT, as well as to the other Sensing Technology Group Members at the Free University of Bolzano. This work was partially supported by the BBVA foundation through the 2019 Leonardo Grant for Researchers and Cultural Creators. Tetracycline (TC) is a widely known antibiotic used worldwide to treat animals. Its residues in animal-origin foods cause adverse health effects to consumers. Low-cost and real-time measuring systems of TC in food samples are, therefore, extremely needed. In this work, a three-electrode sensitive and label-free sensor was developed to detect TC residues from milk and meat extract samples, using CO2 laser-induced graphene (LIG) electrodes modified with gold nanoparticles (AuNPs) and a molecularly imprinted polymer (MIP) used as a synthetic biorecognition element. LIG was patterned on a polyimide (PI) substrate, reaching a minimum sheet resistance (R-sh) of 17.27 +/- 1.04 omega/sq. The o-phenylenediamine (oPD) monomer and TC template were electropolymerized on the surface of the LIG working electrode to form the MIP. Surface morphology and electrochemical techniques were used to characterize the formation of LIG and to confirm each modification step. The sensitivity of the sensor was evaluated by differential pulse voltammetry (DPV), leading to a limit of detection (LOD) of 0.32 nM, 0.85 nM, and 0.80 nM in buffer, milk, and meat extract samples, respectively, with a working range of 5 nM to 500 nM and a linear response range between 10 nM to 300 nM. The sensor showed good LOD (0.32 nM), reproducibility, and stability, and it can be used as an alternative system to detect TC from animal-origin food products. 2022-02-02T13:25:06Z 2022-02-02T13:25:06Z 2021-12-30 journal article Abera, B.D... [et al.]. Laser-Induced Graphene Electrodes Modified with a Molecularly Imprinted Polymer for Detection of Tetracycline in Milk and Meat. Sensors 2022, 22, 269. [https://doi.org/10.3390/s22010269] http://hdl.handle.net/10481/72625 10.3390/s22010269 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI