Reaction Quenching
Reaction Quenching - 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...
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.
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.
09:45
A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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Cited by 5 •
2016
The safe and proper use of organolithium reagents is described.
03:06
Reaction Mechanisms
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2020
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. For instance, the decomposition of ozone appears to follow a mechanism with two steps:
FAQs
Several strategies can terminate the process, including removing a reactant or catalyst, neutralizing reactive intermediates, shifting pH or temperature, and adding a reagent that consumes remaining reaction partners. These mechanisms interrupt different points in the reaction pathway. Selecting the appropriate strategy helps ensure that the measured state reflects the intended time point rather than continued chemical change.
Changing pH or temperature can alter the conditions that sustain reaction progress, allowing researchers to halt chemistry at a defined stage. These changes must be selected carefully because an unsuitable condition may fail to stop the reaction or may promote degradation. In cancer research assays, controlled conditions help preserve the sample state for subsequent measurement.
Reactive intermediates can continue changing the sample after the intended observation time, even when the original reaction partners are no longer being actively monitored. Neutralization removes this source of ongoing chemistry. This is particularly important when researchers need to distinguish changes produced by tumor-cell biology from changes introduced while handling or analyzing the sample.
Quenching establishes a defined endpoint before analysis, reducing the possibility that assay chemistry will continue altering the sample. As a result, measurements of enzyme activity, drug responses, or molecular changes can more closely represent the biological condition at the selected time. This supports clearer comparisons among samples and improves reproducibility across experiments.
The quenching condition should effectively stop the relevant reaction without causing continued degradation or obscuring the measurement of interest. Researchers may choose among reactant or catalyst removal, intermediate neutralization, pH or temperature changes, and reagent addition according to the chemistry involved. Careful selection preserves the sample state and limits handling-related artifacts.
In cancer research, quenching can be used after an assay or treatment period involving tumor cells or tissues. It helps stabilize the material before researchers assess enzyme activity, drug responses, or molecular changes. By stopping the assay chemistry at the planned point, the approach supports comparisons between biological effects and alterations caused during sample handling.