Flunitrazepam, a fast-acting benzodiazepine, is frequently misused as a date-rape drug due to its potent sedative and amnesic effects. Its clandestine addition to beverages poses significant public health risks, necessitating rapid, on-site detection tools. This study presents a novel all-solid-state miniaturized potentiometric sensor fabricated via screen-printing technology for the determination of flunitrazepam in various beverages. The sensor employs silver ink for the reference electrode and carbon ink modified with poly(3,4-ethylenedioxythiophene) (PEDT) nanoparticle dispersion as a hydrophobic conductive layer on the indicator electrode. This PEDT layer effectively prevents the formation of an aqueous interfacial layer between the carbon conductor and the ion-selective membrane, which is a major source of instability and potential drift in solid-contact electrodes.AEBP2 Antibody Formula The ion-selective membrane incorporates potassium tetrakis(p-chlorophenyl)borate (TpClPB) as a cation exchanger and calix[6]arene (CX6) as a neutral ionophore, enabling selective recognition of flunitrazepam cations. A unique unconditioning protocol involving sonication of the membrane cocktail with a concentrated flunitrazepam solution was employed to achieve ion exchange equilibrium without requiring traditional aqueous conditioning steps—critical for miniaturized devices where space constraints prevent such procedures.MATK Antibody Autophagy Electrochemical evaluation demonstrated that the PEDT-based sensor exhibited a Nernstian response with a slope of 57.PMID:34102309 9 mV/decade, a low detection limit of 5.5 × 10⁻⁷ mol L⁻¹, and excellent long-term stability with a potential drift of only 0.9 mV h⁻¹. In contrast, the PEDT-free sensor showed higher drift (5 mV h⁻¹) and reduced sensitivity. The sensor successfully quantified flunitrazepam in spiked carbonated soft drinks, energy drinks, and malt beverages with recovery rates ranging from 93% to 105%, showing no significant difference when compared to official methods. Statistical analysis confirmed high accuracy, repeatability, and intermediate precision. The device’s simplicity, portability, and minimal equipment requirements make it ideal for point-of-care applications. This work establishes a reliable, user-friendly platform for detecting date-rape drugs in real-world samples, offering a promising tool for forensic and public safety applications.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com