A method and a sensor for detecting L-arginine are provided. The method includes synthesizing ferrocene-functionalized hexadecapeptide dithiocyclopentane (FC-P16 Peptide), preparing a polypeptide composite membrane-modified electrode (FC-P16 Peptide/AuE), detecting L-Arg and other steps. The results show that the polypeptide composite membrane-modified electrode (FC-P16 Peptide/AuE) exhibits excellent electrochemical response properties to L-Arg. In 10 mmol/L phosphate-buffered saline (PBS, pH=7.4), the DPV response peak current of the polypeptide composite membrane-modified electrode has an excellent linear relationship with the L-Arg concentration of 1.0×10.sup.−13 mol/L to 1.0×10.sup.−7 mol/L, with a detection limit of 1.0×10.sup.−13 mol/L. With prominent reproducibility, repeatability and selectivity, the modified electrode has potential application in life science and nutritional health.

Disease infection in a plant can be detected at an early stage by utilizing a boron-oxygen compound having a specific structure that selectively recognizes and forms a complex with methyl salicylate, which is a plant hormone released when a plant is infected by a pathogen, as a receptor for sensing, and by utilizing a fluorescence emission phenomenon and a change in electrochemical behavior after the reaction with methyl salicylate.

Disease infection in a plant can be detected at an early stage by utilizing a boron-oxygen compound having a specific structure that selectively recognizes and forms a complex with methyl salicylate, which is a plant hormone released when a plant is infected by a pathogen, as a receptor for sensing, and by utilizing a fluorescence emission phenomenon and a change in electrochemical behavior after the reaction with methyl salicylate.

In an electrochemical lateral flow immunological test method, flow of a sample solution is controlled. As a result, the reaction time is short and quantitative measurements and electrical measurements can be performed with excellent sensitivity and high accuracy, and the invention provides a sensor employed in the method. Electrode portions, electrically conductive portions for transferring electric current from the electrode portions, and connecting portions connected to an electrical measuring instrument for measuring the electric current values are arranged on a supporting body including a resin sheet, pads and the like disposed by partial lamination on the supporting body. A sample solution flows over the plurality of pads, and electrochemical detection is performed by controlling the flow at the position of the electrode portions. Furthermore, the flow is controlled by a flow rate control pad, a flow passage portion fiber pad, and flow rate control protruding portions.

In an electrochemical lateral flow immunological test method, flow of a sample solution is controlled. As a result, the reaction time is short and quantitative measurements and electrical measurements can be performed with excellent sensitivity and high accuracy, and the invention provides a sensor employed in the method. Electrode portions, electrically conductive portions for transferring electric current from the electrode portions, and connecting portions connected to an electrical measuring instrument for measuring the electric current values are arranged on a supporting body including a resin sheet, pads and the like disposed by partial lamination on the supporting body. A sample solution flows over the plurality of pads, and electrochemical detection is performed by controlling the flow at the position of the electrode portions. Furthermore, the flow is controlled by a flow rate control pad, a flow passage portion fiber pad, and flow rate control protruding portions.

An electrode-modified heavy metal ion microfluidic detection chip, comprising a microfluidic module (1) and a three-electrode sensor (2), wherein the microfluidic module (1) is integrally molded by 3D printing, and the interior thereof has a microchannel (10) and a sensor slot (11); and the three-electrode sensor (2) comprises three electrodes (21, 22, 23) printed on a card-shaped bottom plate (20), among which the working electrode (21) is a porous nano-NiMn2O4 modified bare carbon electrode, and the three-electrode sensor (2) is inserted into the sensor slot (11) that matches same to form the microfluidic detection chip.

An electrode-modified heavy metal ion microfluidic detection chip, comprising a microfluidic module (1) and a three-electrode sensor (2), wherein the microfluidic module (1) is integrally molded by 3D printing, and the interior thereof has a microchannel (10) and a sensor slot (11); and the three-electrode sensor (2) comprises three electrodes (21, 22, 23) printed on a card-shaped bottom plate (20), among which the working electrode (21) is a porous nano-NiMn2O4 modified bare carbon electrode, and the three-electrode sensor (2) is inserted into the sensor slot (11) that matches same to form the microfluidic detection chip.

The present invention relates to a method for functionalising a cellulose support with metal nanoparticles comprising the steps of: depositing on the cellulose support a single aqueous solution containing the metal precursor in the form of acid or salt in a concentration from 1 to 6 mM; and placing the cellulose support at a temperature from 65° C. to 80° C. for a time from 10 to 40 minutes. The present invention also relates to a method for producing an electroanalytical sensor comprising said functionalised cellulose support with electrocatalytic and concentration properties of the metal marker at the working electrode and to a method for producing the electroanalytical sensor.

The present invention relates to a method for functionalising a cellulose support with metal nanoparticles comprising the steps of: depositing on the cellulose support a single aqueous solution containing the metal precursor in the form of acid or salt in a concentration from 1 to 6 mM; and placing the cellulose support at a temperature from 65° C. to 80° C. for a time from 10 to 40 minutes. The present invention also relates to a method for producing an electroanalytical sensor comprising said functionalised cellulose support with electrocatalytic and concentration properties of the metal marker at the working electrode and to a method for producing the electroanalytical sensor.

Materials for binding per- and polyfluoroalkyl substances (PFAS) are disclosed. A fluidic device comprising the materials for detection and quantification of PFAS in a sample is disclosed. The fluidic device may be configured for multiplexed analyses. Also disclosed are methods for sorbing and remediating PFAS in a sample. The sample may be groundwater containing, or suspected of containing, one or more PFAS.