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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Related Experiment Video

Updated: May 12, 2026

Detection of Bacteria Using Fluorogenic DNAzymes
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A dexterous fluorescence sensor for diversified-biomarker detection using cyclic EDC-CHA (EDCHA) system.

Jie Du1, Jinjuan Liu2, Hongyan Li1

  • 1Department of Health Examination Center, Shaanxi Provincial People Hospital, Xi'an, China.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|June 25, 2025
PubMed
Summary

A novel double-circuit fluorescence assay, EDCHA, enables sensitive detection of nucleic acids and proteins. This assay has potential for early disease diagnosis and diverse biomarker analysis, including cancer.

Keywords:
Cascade isothermal amplificationFluorescent assaysMicroRNAs detectionProtein detection

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Biomarker monitoring is vital for disease diagnosis, treatment evaluation, and prognosis.
  • Accurate and sensitive detection methods are needed for clinical decision-making.

Purpose of the Study:

  • To develop a robust double-circuit fluorescence assay (EDCHA) for biomarker detection.
  • To enable simultaneous detection of nucleic acids and proteins.

Main Methods:

  • Utilized an EDC (Enzyme-linked DNA Capture) system for initial miRNA identification and signal amplification.
  • Employed a CHA (Chicane-assisted) system for secondary signal amplification.
  • Integrated fluorescent-labeled aptamers for simultaneous protein detection.

Main Results:

  • Achieved sensitive detection of miRNA-21 with a low limit of detection (LOD) of 77.18 pM.
  • Demonstrated simultaneous detection of miRNA and AD-related protein AβO with an LOD of 0.94 nM.
  • Validated the EDCHA assay's potential for diverse biomarker analysis.

Conclusions:

  • The EDCHA assay offers a sensitive and versatile platform for biomarker detection.
  • This method shows significant promise for early disease diagnosis, particularly in cancer.
  • The dual-detection capability expands applications in clinical diagnostics.