4.5 Review

Recent Advances in Electrochemiluminescence-Based Single-Cell Analysis

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Recent Advances in Single Cell Analysis by Electrochemiluminescence

Hao Ding et al.

Summary: Understanding cellular mechanisms is a major goal in biology, and single cell measurements are more accurate than population-averaged assays for studying cellular systems. Electrochemiluminescence (ECL) is an emerging method for single cell analysis, which involves light emission triggered by electrochemical reactions. This review provides an overview of recent research progress on ECL principles and systems for analyzing single cells, including various analytes and their impact on cellular functions.

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Wireless Electrochemical Visualization of Intracellular Antigens in Single Cells

Yuling Wang et al.

Summary: This study demonstrates the successful visualization and recognition of KDM1/LSD1 antigen in a single cell using wireless bipolar electrochemiluminescence (BPE-ECL), solving the challenge of intracellular wireless visualization.

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Confined electrochemiluminescence imaging microarray for high-throughput biosensing of single cell-released dopamine

Ningning Wang et al.

Summary: In this work, a CEIM chip was designed for high-throughput quantification of cell-secreted dopamine. The chip was able to recognize the target DA secretion from cells and emit an ECL signal without the need for additional coreactants.

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Surface-Sensitive Imaging Analysis of Cell-Microenvironment Interactions by Electrochemiluminescence Microscopy

Lurong Ding et al.

Summary: This work presents a surface-sensitive imaging methodology for evaluating cell-matrix adhesion differences at the single cell level and analyzing the impact of the chemical microenvironment on cell behaviors. The study reveals that different surface modifications lead to varying strengths of cell-matrix adhesion, and specific integrin subunits exhibit selective recognition to different surfaces.

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Electrochemiluminescence microscopy: From single objects to living cells

Sara Knezevic et al.

Summary: Electrochemiluminescence (ECL) is a light-emitting phenomenon triggered by electrochemistry, which enables high-precision imaging of luminescent signals. The field of ECL is rapidly evolving from an analytical method widely used in biosensing to a novel microscopy technique. Improving electrode materials, luminophore/coreactant systems, and experimental configurations are the main focus of research.

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Advances in electrochemiluminescence for single-cell analysis

Qian Yang et al.

Summary: In recent years, innovative analytical methods with high sensitivity and spatiotemporal resolution have emerged for qualitative and quantitative analysis at the single-cell and subcellular levels. Among them, single-cell ECL (SCECL) analysis, with excellent spatiotemporal resolution, has become a promising tool for revealing individual cells' heterogeneity and stochastic processes.

ANALYST (2022)

Review Electrochemistry

Recent advances in electrochemiluminescence imaging analysis

Chengda Meng et al.

Summary: Electrochemiluminescence (ECL) has distinctive features that make it widely used in imaging, including high signal-to-noise ratio, sensitivity, linear range, spatiotemporal resolution, and near-zero background light. ECL imaging technology has been applied in immunosensing, pathological cell detection, and drug analysis. Its ease of operation and ability to detect dynamic processes and catalytic sites enhance its potential in material surface and interface research, in vivo biological analysis, and cell visualization. Advancements in nanomaterials and microscopic analysis equipment have further propelled the development of high-resolution ECL imaging technology.

ESCIENCE (2022)

Article Chemistry, Multidisciplinary

A temperature-tuned electrochemiluminescence layer for reversibly imaging cell topography

Cheng Ma et al.

Summary: This study develops a temperature-tuned ECL layer to image single cell topography at different heights by regulating the thickness of the ECL layer with electrode temperature. The ECL layer in two routes shows different regulation ranges with elevated temperature, providing a flexible approach to adjust the imaging scope within specific heights. Moreover, a heated electrode significantly improves the image quality of cell adhesion in heterogeneous electrochemical rate-determined situations. This work offers a new approach to regulate the ECL layer and has promising applications in monitoring transient heat generation from biological entities.

CHEMICAL SCIENCE (2022)

Article Chemistry, Multidisciplinary

Dual Intramolecular Electron Transfer for In Situ Coreactant-Embedded Electrochemiluminescence Microimaging of Membrane Protein

Ningning Wang et al.

Summary: This study developed a new strategy and system using TEA-Pdots to embed coreactants in the ECL mechanism, leading to significantly improved ECL emission strength. The system can be used for in situ ECL microimaging on single living cells without the need for additional permeable treatment.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Biophysics

Enhanced electrochemiluminescence ratiometric cytosensing based on surface plasmon resonance of Au nanoparticles and nanosucculent films

Hong Zhou et al.

Summary: This study proposed a dual-potential ratiometric sensing strategy for the electrochemiluminescence detection of Ramos cells based on two types of ECL-responding molecular. The method shows low detection limit, good selectivity, and specificity through detecting ECL signal.

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Reflections on the organization and the physical state of chromatin in eukaryotic cells

Hilmar Strickfaden

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GENOME (2021)

Article Chemistry, Multidisciplinary

Super-Resolution Electrogenerated Chemiluminescence Microscopy for Single-Nanocatalyst Imaging

Ming-Ming Chen et al.

Summary: The super-resolution ECLM technique allows for high-resolution imaging of single nanoparticles' catalytic activity, revealing surface characteristics of nanocatalysts. This technology has great potential applications in catalysis, biological imaging, and single-entity analysis.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Novel gold nanoparticles functionalized Mo-polydopamine hollow sphere as an efficient quencher in conjugated microporous polymer electrochemiluminescent system

Li Song et al.

Summary: An ECL sandwich immunosensor was developed for sensitive detection of PSA, utilizing novel materials and achieving good performance, stability, and reproducibility.

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Deployment of MIL-88B(Fe)/TiO2 Nanotube-Supported Ti Wires as Reusable Electrochemiluminescence Microelectrodes for Noninvasive Sensing of H2O2 from Single Cancer Cells

Xiaoxia Jian et al.

Summary: The study evaluated a high-performance solid-state ECL H2O2 sensor based on MIL-88B(Fe) nanocrystal-anchored Ti microwires, showing ultrahigh sensitivity, long-term stability, and excellent photocatalytic activity in the visible-light range at the single-cell level. The electrode demonstrated synergistic effects between the TiO2 luminophore and the peroxidase-like activity of MIL-88B(Fe), making it suitable for cytosensing applications.

ANALYTICAL CHEMISTRY (2021)

Article Chemistry, Analytical

A Synergistic Coreactant for Single-Cell Electrochemiluminescence Imaging: Guanine-Rich ssDNA-Loaded High-Index Faceted Gold Nanoflowers

Ying Chen et al.

Summary: In this study, a guanine-rich DNA carrier was utilized as a synergistic coreactant for Ru(bpy)(3)(2+), achieving highly selective ECL imaging of CEA. Compared with the common coreactant tripropylamine, this novel coreactant is considered to have high performance and biocompatibility, providing exciting opportunities in single-cell imaging and detection.

ANALYTICAL CHEMISTRY (2021)

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Bioinspired N-C coated ZnO based electrochemiluminescence sensor for dopamine screening from neuroblastoma patient

Aqsa Munawar et al.

Summary: A novel sensing platform based on NC@ZnO was developed for precise monitoring of dopamine. The material was characterized through SEM, TEM, XPS, and Raman spectroscopy, demonstrating the successful application of the enhanced ECL intensity system for dopamine detection.

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Direct imaging of single-molecule electrochemical reactions in solution

Jinrun Dong et al.

Summary: Optical imaging of single-molecule electrochemical reactions in aqueous solution enables super-resolution electrochemiluminescence microscopy, providing high spatiotemporal resolution for monitoring adhesion dynamics of live cells. Single-molecule methods go beyond ensemble averages and reveal statistical distribution of reaction positions, pathways, and dynamics, advancing fundamental understanding of electrochemical reactions and proving useful for bioassays and cell-imaging applications.

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Electrogenerated chemiluminescence detection of single entities

Wei Zhao et al.

Summary: Electrogenerated chemiluminescence (ECL) is a process in which light is produced by excited luminophores generated during redox reactions induced by electrochemistry. Analyzing single entities such as molecules, micro/nanoparticles, and cells using ECL can provide insights into new truths of nature that may be hidden in complex systems or averaged out in ensemble assays.

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Single-cell-resolved measurement of enzyme activity at the tissue level using drop-on-demand microkits

Rongcan Huang et al.

Summary: Using drop-on-demand microkits with a diameter of around 20 μm, the activity of acetylcholinesterase (AChE) in a brain slice is measured at single-cell resolution, showing a high relative standard deviation of 73.3% among 25 cellular regions. This approach offers an alternative strategy for exploring enzymatic heterogeneity at the tissue level with single-cell resolution.

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Understanding the ECL interaction of luminol and Ru(bpy)32+ luminophores by spectro-electrochemiluminescence

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