Fluorescence Quenching Detection
Fluorescence Quenching Detection - Related Videos
10:57
Quenching and Boiling
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2023
Source: Alexander S Rattner, Sanjay Adhikari, and Mahdi Nabil; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Controlled heating followed by rapid cooling is an important element of many materials processing applications. This heat-treating procedure can increase material hardness, which is important for cutting tools or surfaces in high wear environments. The rapid cooling stage is called quenching, and is often performed by immersing...
10:55
Fluorescence-quenching of a Liposomal-encapsulated Near-infrared Fluorophore as a Tool for In Vivo Optical Imaging
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Cited by 15 •
2015
The use of fluorophores for in vivo imaging can be greatly limited by opsonization, rapid clearance, low detection sensitivity and cytotoxic effects on the host. Encapsulation of fluorophores in liposomes by film hydration and extrusion leads to fluorescence quenching and protection which enables in vivo imaging with high detection sensitivity.
08:58
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
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Cited by 28 •
2011
We present an experimental procedure for measuring the partial pressure of oxygen (pO2) in cerebral vasculature based on oxygen-dependent quenching of phosphorescence. Animal preparation and imaging procedures were outlined for both large field of view CCD-based imaging of pO2 in rats and 2-photon excitation based imaging of pO2 in mice.
07:47
Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
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Cited by 7 •
2016
Quorum-quenching enzymes are anti-virulent and anti-bacterial options that can mitigate pathogenesis without risk of incurring resistance, by preventing the expression of virulence factors and genes associated with antibiotic resistance and biofilm formation. In this study, we report a method that demonstrates the efficacy of quorum-quenching enzymes in bacterial biofilm disruption.
03:44
Detection of Inflammasome Activation via Fluorescence Microscopy
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2025
This video demonstrates a method to detect NLRP3 inflammasome activation in macrophages using fluorescent reporter probes. The cells are treated with potassium ionophores and glycine to induce inflammasome assembly and caspase-1 activation. Fluorescent reporter probes visualize activated caspase-1, and cells are stained with a fluorescent dye for nuclei visualization.
FAQs
Fluorescence quenching detection can reflect two different interaction pathways. In dynamic quenching, a quencher encounters an excited fluorophore and removes its energy during the interaction. In static quenching, the quencher forms a nonfluorescent complex with the fluorophore instead. Distinguishing these mechanisms matters because the signal decrease represents different molecular events in a biological assay.
The measured decrease in fluorescence intensity can be compared across samples containing different amounts of the target or quencher. When the change is associated with quencher concentration, the fluorescence response provides an analytical basis for identifying or measuring that substance. This relationship allows the method to support quantitative biological measurements rather than only qualitative detection.
Binding or a conformational change can alter the interaction between a fluorophore and a quencher, producing a measurable change in fluorescence. This makes the signal useful for following molecular interactions, not simply for measuring free substances. In biochemical research, such responses can provide information about how proteins, nucleic acids, or other biomolecular components interact.
An assay monitors fluorescence intensity and examines whether it decreases when the relevant biological substance or interaction is present. The observed signal is then related to the presence or amount of quencher, when that relationship has been established. Because the measurement can be performed over time, the workflow can follow changes as they occur rather than relying only on an endpoint.
Within biological techniques, the approach can be applied to ions, metabolites, proteins, and nucleic acids. It can also examine molecular interactions, including binding and conformational changes. This broad target range makes quenching-based assays relevant to biochemical research, where the same fluorescence readout can be adapted to different analytes or interaction questions.
Its usefulness comes from combining a simple fluorescence readout with sensitivity to changes caused by molecular interactions. Compatibility with real-time measurements allows biosensors and biochemical experiments to track signal changes as they develop. The resulting data can support detection or measurement of biological substances while also revealing interaction-related changes in the assay system.