Electrochemical biosensor for quantitative determination of fentanyl based on immobilized cytochrome c on multi-walled carbon nanotubes modified screen-printed carbon electrodes. - González-Hernández, Jerson; Moya-Alvarado, Guillermo; Alvarado-Gámez, Ana Lorena; Urcuyo, Roberto; Barquero-Quirós, Miriam; Arcos-Martínez, María Julia (Microchimica Acta, 2022)