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Related Concept Videos

Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

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Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

275
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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    Area of Science:

    • Biochemistry
    • Biophysics
    • Cellular Biology

    Background:

    • Fluorescent reporters noninvasively monitor dynamic processes in living systems.
    • Voltage-sensitive fluorophores (VF dyes) detect membrane potential (Vm) via photoinduced electron transfer.
    • Previous reverse VF dyes (ReverseVFs) had low voltage sensitivity and signal-to-noise ratio (SNR).

    Purpose of the Study:

    • To develop a second-generation ReverseVF with improved voltage sensitivity and SNR.
    • To explore physical organic processes governing VF probe voltage sensitivity.
    • To create a more effective Vm probe for bioelectrical signaling.

    Main Methods:

    • Designed and synthesized novel ReverseVF probes.
    • Investigated physical organic mechanisms of voltage sensitivity.
    • Tested the 4-NO2 carbofluorescein VF dye in cellular imaging.

    Main Results:

    • Developed a second-generation ReverseVF, 4-NO2 carbofluorescein.
    • Achieved a nearly 4-fold increase in voltage sensitivity and 10-fold increase in SNR.
    • Demonstrated turn-on response to membrane hyperpolarization.
    • Enabled two-color voltage imaging and action potential detection in neurons.

    Conclusions:

    • The 4-NO2 carbofluorescein VF dye represents a significant advancement in Vm probe technology.
    • High sensitivity and brightness allow for cellular-resolution imaging of bioelectrical activity.
    • This probe facilitates noninvasive monitoring of neuronal signaling and cellular electrophysiology.