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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
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Electrodes: Overview01:17

Electrodes: Overview

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
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Solid-Contact Ion-Selective Electrodes for Histamine Determination.

Siyuan Ma1, You Wang1, Wei Zhang1

  • 1State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China.

Sensors (Basel, Switzerland)
|October 13, 2021
PubMed
Summary

New solid-contact ion-selective electrodes offer sensitive and rapid histamine determination. These histamine (HA) sensors demonstrate excellent stability and selectivity for biological applications.

Keywords:
artificial cerebrospinal fluidhistamine electrodeporphyrinssolid-contact

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Area of Science:

  • Electroanalytical Chemistry
  • Materials Science
  • Biomedical Engineering

Background:

  • Histamine (HA) is a crucial biogenic amine involved in physiological and pathological processes.
  • Accurate and rapid determination of histamine is essential for clinical diagnostics and biological research.
  • Existing methods for histamine detection can be complex or lack real-time monitoring capabilities.

Purpose of the Study:

  • To develop and characterize novel solid-contact ion-selective electrodes (SC-ISEs) for sensitive histamine determination.
  • To evaluate the performance of the fabricated histamine sensors in terms of detection limit, response time, stability, and selectivity.
  • To assess the potential applicability of these histamine electrodes in biological fluid analysis.

Main Methods:

  • Fabrication of SC-ISEs using a gold wire substrate coated with poly(3,4-ethlenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS).
  • Construction of the selective membrane using a polyvinyl chloride matrix incorporating a specific iron(III) porphyrin chloride ionophore, 2-nitrophenyloctyl ether plasticizer, and potassium tetrakis(p-chlorophenyl) borate ion exchanger.
  • Comprehensive electrochemical characterization, including potentiometric measurements, to assess electrode performance.

Main Results:

  • The developed histamine electrodes exhibited a low detection limit of 8.58 × 10-6 M.
  • A rapid response time of less than 5 seconds was achieved.
  • The electrodes demonstrated good reproducibility, long-term stability, and selectivity against common biological interferences.
  • Stable performance was observed within a pH range of 7-8 and a temperature range of 35-41 °C.
  • A high recovery rate of 99.7% in artificial cerebrospinal fluid indicated suitability for biological applications.

Conclusions:

  • The fabricated solid-contact ion-selective electrodes provide a promising platform for accurate and efficient histamine quantification.
  • The sensor's characteristics suggest its potential utility in real-time monitoring of histamine in biological samples.
  • This development contributes to advancing electrochemical sensing technologies for biomedical diagnostics.