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Updated: Jan 28, 2026
12:25
Counting Proteins in Single Cells with Addressable Droplet Microarrays
Published on: July 6, 2018
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One Cell at a Time: Single-Entity Impact Electrochemistry for Bacterial Counting and Functional Profiling.
Xuan-Bo Chen1, Meihong Peng1, Zhen Peng1
1State Key Laboratory of Chemo and Biosensing, Department of Chemistry and Chemical Engineering, Hunan University, Changsha, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 27, 2026
Summary
Single-entity impact electrochemistry (SEIE) offers a novel method for analyzing individual bacteria, revealing functional heterogeneity missed by population assays. This technique quantifies cell behavior through electrochemical signals, advancing diagnostics and treatment response understanding.
Area of Science:
- Electrochemistry
- Microbiology
- Analytical Chemistry
Background:
- Population-averaged assays obscure critical functional heterogeneity in bacterial populations.
- Understanding single-bacterium behavior is vital for pathogenicity, metabolic adaptation, and treatment response.
- Single-entity impact electrochemistry (SEIE) offers a complementary single-cell measurement paradigm.
Purpose of the Study:
- To present a mechanism-guided framework for applying SEIE to bacterial analysis.
- To detail increasing analytical depths within SEIE for bacterial interrogation.
- To outline challenges and opportunities for translating SEIE into practical applications.
Main Methods:
- Utilizing discrete current transients from individual cell collisions with a polarized ultramicroelectrode.
- Analyzing waveform observables (frequency, charge, duration, polarity) to link cell behavior to electrochemical signals.
- Exploring SEIE for bacterial counting, metabolic metrology via redox mediators, and secretion analysis.
Main Results:
- SEIE provides a quantitative language linking transport, cell-electrode physics, and reporting mechanisms to biological state.
- Bacterial counting is framed as impact physics, dependent on waveform families, electrode bias, and transport regimes.
- Exogenous redox mediators and endogenous reporters enable deeper metabolic and secretion analysis.
Conclusions:
- SEIE offers a versatile platform for detailed single-bacterium analysis.
- Key challenges for translation include operation in complex media, antifouling, standardization, and high-throughput platforms.
- Future opportunities lie in multimodal integration and automated analysis for point-of-care and antimicrobial susceptibility testing.
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