Related Experiment Video
Updated: Nov 1, 2025
13:15
Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
Published on: June 1, 2011
34.1K
Single-Entity Electrochemistry for Digital Biosensing at Ultralow Concentrations
Serge G Lemay1, Taghi Moazzenzade1
1MESA+ Institute for Nanotechnology and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Analytical Chemistry
|June 25, 2021
Summary
Digital sensing using large arrays of single-entity detectors offers a novel approach to overcoming challenges in quantifying ultralow analyte concentrations, improving electrochemical affinity sensor performance.
Area of Science:
- Analytical Chemistry
- Electrochemistry
- Biosensing
Background:
- Quantifying ultralow analyte concentrations presents significant challenges in analytical sciences, particularly in electrochemistry.
- Limitations include inefficient mass transport, slow reaction kinetics, and detecting small signals against background noise.
- While single-entity detection methods exist, they do not always ensure superior concentration sensitivity due to transducer miniaturization issues.
Purpose of the Study:
- To discuss the potential of digital sensing for overcoming limitations in quantifying ultralow analyte concentrations.
- To explore the advantages of using large arrays of separately addressable single-entity detectors.
- To identify barriers to the implementation of digital sensing in electrochemical affinity sensors.
Main Methods:
- Discussion of digital sensing as a strategy employing large arrays of single-entity detectors.
- Analysis of how separately addressable detectors provide real-time information on individual binding events.
- Review of challenges and potential solutions for mass transport and kinetic limitations.
Main Results:
- Digital sensing offers a pathway to enhanced concentration sensitivity by aggregating data from numerous single-entity detectors.
- Real-time information on individual binding events can be obtained, improving signal-to-noise ratio.
- Implementation barriers include array fabrication, addressing individual detectors, and data processing.
Conclusions:
- Digital sensing presents a promising paradigm for achieving high sensitivity in quantifying ultralow analyte concentrations.
- This approach addresses key limitations of traditional electrochemical affinity sensors.
- Further research and technological development are needed to overcome implementation barriers.
Related Concept Videos
01:17Controlled-Potential Coulometry: Electrolytic Methods
381
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...
The chosen potential...
381
01:15Potentiometry: Membrane Electrodes
987
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...
987
01:06Interfacial Electrochemical Methods: Overview
542
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
542