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Amperometry: Overview01:10

Amperometry: Overview

Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...

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Bio-layer Interferometry for Measuring Kinetics of Protein-protein Interactions and Allosteric Ligand Effects
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A Calix[4]arene-based wettability interface sensor for rapid ATP detection.

Haonan Qu1, Haifan Zhang1, Cuiguang Ma1

  • 1State Key Laboratory of Green Pesticide, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China.

Biosensors & Bioelectronics
|October 1, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel bi-amide calix [4]arene (BAC4) material for detecting adenosine triphosphate (ATP), a key cellular energy indicator. This advancement offers precise detection for applications in biomedicine and biotechnology.

Keywords:
ATP sensorCalix[4]areneClick chemistryWettability

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Area of Science:

  • Biochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Adenosine triphosphate (ATP) is a crucial indicator of cellular energy metabolism.
  • ATP detection technologies are vital for advancements in biomedicine, microbiology, bioengineering, precision medicine, and biotechnology.

Purpose of the Study:

  • To synthesize and characterize a novel bi-amide calix [4]arene (BAC4) material.
  • To develop a surface-based detection platform for ATP using BAC4-modified self-assembled monolayers (BAC4-SAMs).
  • To investigate the selectivity, sensitivity, and mechanism of ATP recognition by BAC4-SAMs.

Main Methods:

  • Synthesis of bi-amide calix [4]arene (BAC4) and its surface modification via click chemistry.
  • Characterization of BAC4-SAMs using X-ray photoelectron spectroscopy (XPS) and water contact angle (CA).
  • Evaluation of ATP detection selectivity against ADP and AMP, and sensitivity down to 5.5 × 10⁻⁶ M.
  • Analysis of the recognition mechanism using UV-vis, ¹H NMR, and AFM.
  • Monitoring of ATP hydrolysis using the developed BAC4-SAMs platform.

Main Results:

  • BAC4 was synthesized in 85% yield and successfully modified onto a silicon surface as BAC4-SAMs.
  • BAC4-SAMs demonstrated high selectivity for ATP over ADP and AMP.
  • The wettability of BAC4-SAMs was reversibly modulated between superhydrophobic and superhydrophilic states in the presence/absence of ATP.
  • ATP was detectable at concentrations as low as 5.5 × 10⁻⁶ M.
  • The recognition mechanism was elucidated, and ATP hydrolysis monitoring was successfully achieved.

Conclusions:

  • The developed BAC4-SAMs platform offers a sensitive and selective method for ATP detection.
  • The reversible wettability change provides a visual indicator for ATP presence.
  • This technology has potential applications in various fields requiring ATP monitoring, including diagnostics and biotechnology.