Concentration Determination
Concentration Determination - Related Videos
09:28
Viral Concentration Determination Through Plaque Assays: Using Traditional and Novel Overlay Systems
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Cited by 466 •
2014
Plaque assays are the gold standard for viral quantification, utilizing entrapping overlays on host cellular monolayers to determine viral titers. While various semisolid overlays have traditionally been used, here we demonstrate plaque techniques comparing semisolid overlays to a novel liquid microcrystalline cellulose among several families of viruses.
19:16
The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
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Cited by 26 •
2010
We apply label-free protein interaction analysis using Biacore X100 for structure-function analysis of the binding of several cystatin B mutants to papain through kinetic characterization. Calibration-free concentration analysis (CFCA) measures the concentration of protein with retained binding activity without the need for a standard curve. We show that confirmation of concentrations using CFCA increases the reliability of the kinetic analysis and that kinetic constants can reliably be...
10:29
Microvolume Protein Concentration Determination using the NanoDrop 2000c Spectrophotometer
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Cited by 129 •
2009
Microvolume samples are quantified by a spectrophotometer system that uses natural surface tension to retain samples without the use of cuvettes or capillaries. The dynamic range of protein concentrations and speed by which they can be measured are greatly increased with this method.
01:31
Determining the Minimum Inhibitory Concentration of Enrofloxacin Against Avian Pathogenic E. coli
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2026
Begin with a suspension of avian pathogenic E. coli or APEC in growth media.APEC is a Gram-negative bacterium that infects poultry by entering through the respiratory tract.After breaching the mucosal layer, APEC adhere to epithelial cells, multiply locally, and disrupt the epithelial barrier to enter the bloodstream. The bacteria then spread to multiple organs, causing systemic infection.Add an equal volume of the bacterial suspension to each well of a multi-well plate containing increasing...
10:04
Collecting Variable-concentration Isothermal Titration Calorimetry Datasets in Order to Determine Binding Mechanisms
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Cited by 3 •
2011
ITC is a powerful tool for studying the binding of a ligand to its host. In complex systems however, several models may fit the data equally well. The method described here provides a means to elucidate the appropriate binding model for complex systems and extract the corresponding thermodynamic parameters.
FAQs
Molarity calculations require the measured amount of solute to be expressed relative to the solution volume, with units kept consistent throughout the calculation. This approach is useful when preparing solutions or comparing samples because the resulting value can be linked directly to reaction stoichiometry. Reporting units alongside the numerical result helps make measurements comparable.
Known standards provide reference points that relate a measurable property, such as absorbance, to solute concentration. A sample measurement can then be compared with this established relationship rather than interpreted in isolation. The quality of the result depends on appropriate standards and careful measurement, making calibration especially valuable when direct mass or volume measurements do not provide the needed concentration.
Spectrophotometry uses absorbance as the measured property and relates that signal to concentration through standards or a calibration curve. Titration instead uses reaction stoichiometry and an equivalence point, the condition at which the reacting amounts correspond according to the chemical equation. The choice depends on which measurable property and comparison approach best suit the sample and analysis.
A reliable procedure begins with careful sampling, followed by measurement of a property connected to solute amount. The result is interpreted using a molarity calculation, a calibration curve, or a reaction equivalence point, depending on the method. Consistent units and appropriate comparison standards are essential because errors in sampling or reporting can affect the final concentration.
A calibration curve is appropriate when concentration must be inferred from a measured response, such as absorbance, rather than obtained solely from recorded mass and volume. Chemists compare the sample response with known standards to estimate its concentration. This approach supports analyses in which the measurable signal provides the practical connection between the sample and the amount of solute.
Accurate results support solution preparation, reaction monitoring, and quality control by allowing chemists to compare samples and maintain intended chemical conditions. The same measurements contribute to environmental testing and biochemical analysis, where concentration data help characterize samples. In each setting, careful sampling, suitable units, and an appropriate measurement approach improve the usefulness and comparability of the results.