Perchloric Acid Quench
Perchloric Acid Quench - 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.
03:05
Acid Strength and Molecular Structure
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2020
Binary Acids and Bases In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
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.
06:03
Quantification of Endothelial Fatty Acid Uptake using Fluorescent Fatty Acid Analogs
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2025
This protocol details an in vitro assay for measuring cellular lipid uptake in endothelial cells upon stimulation with BODIPY-C12 and BODIPY-C16 fluorescent analogs of long-chain and very long-chain saturated fatty acids. This method is efficient and adaptable to other cell types, offering a useful approach for studying lipid metabolism.
FAQs
Rapid acidification sharply lowers the sample pH, which denatures proteins and inactivates enzymes before they can continue altering cellular metabolites. This immediate chemical change helps preserve the metabolites’ state at the time of sampling rather than allowing ongoing biological reactions to modify it. The approach is therefore valuable when accurate measurement depends on limiting post-sampling changes.
Protein precipitation removes much of the macromolecular material from the soluble fraction. Perchloric acid causes proteins to denature and precipitate, while soluble small molecules can remain in the liquid phase. This creates a practical separation between analytes such as metabolites and nucleotides and the protein material that could otherwise complicate subsequent analysis.
The treatment is best suited to compounds that tolerate the strongly acidic conditions used during quenching. Acid-stable metabolites, nucleotides, and related small molecules are more likely to remain suitable for measurement after exposure, neutralization, and clarification. The chemical stability of the target therefore influences whether this preparation approach is appropriate for a particular biological analysis.
After acid addition has stopped the biological reactions and precipitated proteins, the sample can undergo neutralization followed by centrifugation. Neutralization adjusts the acidic extract, while centrifugation helps separate the precipitated material and produce a clarified liquid fraction. That clarified extract can then support analysis of the soluble, acid-stable compounds retained in the preparation.
Perchloric acid requires controlled handling because it is highly corrosive and a strong oxidizer. The procedure should use compatible equipment and appropriate safety practices, while maintaining conditions that support rapid quenching and reliable separation. These precautions are essential both for protecting personnel and for preventing equipment incompatibility from compromising sample preparation.
This preparation is useful when investigators need to measure cellular metabolites, nucleotides, or other acid-stable compounds while minimizing chemical changes after sampling. It combines reaction arrest with removal of precipitated macromolecular material, producing a clarified extract for analysis. The method therefore connects rapid biological sample stabilization with downstream measurements of soluble cellular chemistry.