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[Display omitted] • Ultrasensitive detection of feed additive ractopamine using swift and economical electrochemical technique. • Fabrication of novel ZnFe 2 O 4 /3DG/SPCE for selective and reliable ractopamine quantification. • This is the first work that reports ractopamine detection using ZnFe 2 O 4 nanomaterial. • The fabricated ractopamine sensor has comparatively very low detection limit of 1 nM in nanomolar range. • Practical feasibility of ractopamine sensor was successfully validated in pork, beef, and sausage samples. Accurate detection of feed additive is significant for food safety monitoring, warding off its illegal use in livestock production, safeguarding public health, and regulatory compliance. Hence, this paper presents a cost-effective and ultrasensitive electrochemical sensor for detecting commonly used animal feed additive, ractopamine to combat food frauds in meat samples. The sensor was created by embedding spinel zinc ferrite nanospheres (ZnFe 2 O 4) on three-dimensional graphene (3DG) nanosheets using sonochemical method. ZnFe 2 O 4 nanospheres were synthesized using solvothermal approach, and 3DG was prepared using hydrothermal method. Various characterization techniques were used for inspecting structural and morphological properties of materials, including XRD, SEM, TEM, elemental mapping, Raman spectroscopy, XPS, and EIS. The hybrid nanocomposite modified electrode showed excellent electrochemical performance, with high sensitivity of 16.97 μA μM−1 cm−2 and detection limit of 1 nM. The practicality of sensor was demonstrated by performing real sample analysis in pork, beef, and sausage which gave adequate recovery. [ABSTRACT FROM AUTHOR]

The efficient degradation and accurate quantification of tetracycline in environment and food samples is pivotal for ensuring public health and safety by monitoring potential contamination and maintaining regulatory standards. Hence, in this study, photocatalytic degradation of tetracycline and its electrochemical detection in environment and food samples based on dual-functional silver-doped zinc ferrite nanoparticles embedded chitosan-functionalized carbon nanofibers fabricated on a screen-printed carbon electrode (AgZFO/CHIT-CNF/SPCE) is presented. A hydrothermal method was used in the synthesis of Ag-doped ZFO, and chitosan was functionalized on the CNF surface using a swift and cost-effective chemical modification process of carboxyl groups. Various techniques, such as XRD, HRTEM, elemental mapping, EIS, XPS, FTIR, VSM, BET, UV–Vis DRS, and Raman spectroscopy were used to analyze the characteristics of the prepared nanocomposite. Cyclic voltammetry and differential pulse voltammetry were used to evaluate the surface-controlled electrocatalytic properties of AgZFO/CHIT-CNF towards tetracycline. Electrochemical tests revealed that the proposed electrode exhibited excellent sensitivity for detecting tetracycline. The fabricated electrode had a low detection limit of 1 nM and a wide linear range (0.2–53.2 μM). The sensor also demonstrated exceptional selectivity, stability, and reusability. The practical feasibility evaluated with real samples, including chicken feed, shrimp, milk, soil, and wastewater, resulted in high recovery values. [Display omitted] • Ultrasensitive detection of polyketide drug tetracycline based on AgZFO/CHIT-CNF/SPCE. • Photocatalytic degradation of tetracycline with high efficiency (95.72%) using dual-functional nanocomposite. • This is the first work that reports tetracycline detection using ZFO based nanomaterial. • A very low detection limit (1 nM) in nanomolar range was achieved for proposed sensor. • High recovery values for practical feasibility analysis in wastewater, soil, chicken feed, shrimp, and milk. [ABSTRACT FROM AUTHOR]

The efficient degradation and accurate quantification of tetracycline in environment and food samples is pivotal for ensuring public health and safety by monitoring potential contamination and maintaining regulatory standards. Hence, in this study, photocatalytic degradation of tetracycline and its electrochemical detection in environment and food samples based on dual-functional silver-doped zinc ferrite nanoparticles embedded chitosan-functionalized carbon nanofibers fabricated on a screen-printed carbon electrode (AgZFO/CHIT-CNF/SPCE) is presented. A hydrothermal method was used in the synthesis of Ag-doped ZFO, and chitosan was functionalized on the CNF surface using a swift and cost-effective chemical modification process of carboxyl groups. Various techniques, such as XRD, HRTEM, elemental mapping, EIS, XPS, FTIR, VSM, BET, UV–Vis DRS, and Raman spectroscopy were used to analyze the characteristics of the prepared nanocomposite. Cyclic voltammetry and differential pulse voltammetry were used to evaluate the surface-controlled electrocatalytic properties of AgZFO/CHIT-CNF towards tetracycline. Electrochemical tests revealed that the proposed electrode exhibited excellent sensitivity for detecting tetracycline. The fabricated electrode had a low detection limit of 1 nM and a wide linear range (0.2–53.2 μM). The sensor also demonstrated exceptional selectivity, stability, and reusability. The practical feasibility evaluated with real samples, including chicken feed, shrimp, milk, soil, and wastewater, resulted in high recovery values. [Display omitted] • Ultrasensitive detection of polyketide drug tetracycline based on AgZFO/CHIT-CNF/SPCE. • Photocatalytic degradation of tetracycline with high efficiency (95.72%) using dual-functional nanocomposite. • This is the first work that reports tetracycline detection using ZFO based nanomaterial. • A very low detection limit (1 nM) in nanomolar range was achieved for proposed sensor. • High recovery values for practical feasibility analysis in wastewater, soil, chicken feed, shrimp, and milk. [ABSTRACT FROM AUTHOR]