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Gas Chromatography: Types of Detectors-I

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...

Gas Chromatography: Types of Detectors-II

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...

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Related Experiment Video

Updated: May 2, 2026

Method for Measurement of Viral Fusion Kinetics at the Single Particle Level

Method for Measurement of Viral Fusion Kinetics at the Single Particle Level

Published on: September 7, 2009

Fuel-Free Rolosense: Viral Sensing Using Diffusional Particle Tracking.

Selma Piranej¹, Krista Jackson^1,2, Luona Zhang¹

¹Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States.

|November 5, 2025

Summary

This summary is machine-generated.

Fuel-free Rolosense offers a novel mechanical approach for rapid, sensitive viral detection without PCR. This technology uses microparticle motion to identify intact virions, enabling early infection diagnosis.

Keywords:

Brownian diffusion aptamers biosensing exhaled breath condensate motion-based detection single-particle tracking viral detection

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Last Updated: May 2, 2026

Method for Measurement of Viral Fusion Kinetics at the Single Particle Level

Method for Measurement of Viral Fusion Kinetics at the Single Particle Level

Published on: September 7, 2009

Fluorescence detection methods for microfluidic droplet platforms

Fluorescence detection methods for microfluidic droplet platforms

Published on: December 10, 2011

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Area of Science:

Biophysics
Nanotechnology
Molecular Diagnostics

Background:

Conventional viral diagnostics rely on PCR, requiring specialized equipment and time.
Existing methods often detect viral nucleic acids, not intact infectious virions.

Purpose of the Study:

To introduce fuel-free Rolosense, a mechanical force-sensing diagnostic platform.
To demonstrate sensitive and specific detection of intact viral particles.

Main Methods:

Utilizing aptamer-coated microparticles and Brownian motion on an aptamer-modified surface.
Detecting viral presence by observing the stalling of microparticle motion due to cross-linking.
Employing a 3D-printed microscope (Roloscope) for readout.

Main Results:

Achieved a limit of detection as low as 10^3 copies/mL for SARS-CoV-2 variants (BA.1, BA.5).
Successfully differentiated SARS-CoV-2 from Influenza A, HCoV OC43, and 229E.
Demonstrated deep learning analysis of single-particle binding events.

Conclusions:

Fuel-free Rolosense provides a rapid, sensitive, and specific method for intact virion detection.
The technology shows potential for point-of-care and home-based viral diagnostics.
This mechanical transduction strategy offers a complementary alternative to existing diagnostic methods.