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Related Concept Videos

Thermodynamics: Activity Coefficient01:24

Thermodynamics: Activity Coefficient

Activity is the measure of the effective concentration of the species in solution. It can be expressed as the product of the molar concentration of the species and its activity coefficient. The activity coefficient is a dimensionless quantity and depends on the total ionic strength of the solution.
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...
Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a decrease in the...
Physiological Pharmacokinetic Models: Assumption with Protein Binding01:13

Physiological Pharmacokinetic Models: Assumption with Protein Binding

Physiological models with protein binding in pharmacokinetics offer a sophisticated approach to understanding drug disposition. These models consider drug-protein interactions, enabling them to effectively predict drug concentrations in different organs and tissues. This precision aids in accurate drug dosing, providing a significant advantage over conventional models. A key process within these models is equilibration, which ensures that drug concentrations achieve a steady state within the...
The Debye–Hückel Theory of Electrolyte Solutions01:27

The Debye–Hückel Theory of Electrolyte Solutions

The Debye–Hückel theory, established by Peter Debye and Erich Hückel in 1923, is a fundamental concept in physical chemistry. It provides an understanding of the behavior of strong electrolytes in solution, particularly explaining their deviations from ideal behavior.The theory is based on Coulombic interactions (the attraction or repulsion between charged particles) between ions in solution. In an ionic solution, oppositely charged ions tend to attract each other. This means that cations...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

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The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
19:16

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Published on: March 17, 2010

An activity coefficient model for proteins.

S M Agena1, I D Bogle, F L Pessoa

  • 1Department of Chemical and Biochemical Engineering, University College London, Torrington Place, London, WC1E 7JE, United Kingdom. agena@crystal.msfc.nasa.gov

Biotechnology and Bioengineering
|July 5, 1997
PubMed
Summary
This summary is machine-generated.

This study models protein activity coefficients using the UNIQUAC model, improving predictions of protein solubility in various salt solutions. The findings offer insights into factors affecting protein behavior in biochemical processes.

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Area of Science:

  • Biochemical Engineering
  • Physical Chemistry
  • Thermodynamics

Background:

  • Modeling biochemical component properties is crucial for process development.
  • Protein solution properties, like solubility, are often described by activity coefficients.

Purpose of the Study:

  • To apply the original UNIQUAC model for the first time to protein solutions.
  • To model protein activity coefficients and predict protein solubility.

Main Methods:

  • Utilized the UNIQUAC model to represent protein activity coefficients.
  • Investigated ten protein-salt-water systems with four distinct proteins.
  • Compared model-calculated coefficients with those from osmotic measurements via virial expansion.

Main Results:

  • Achieved a root-mean-squared deviation of 0.54% in model predictions.
  • Analyzed the impact of salt concentration, pH, salt type, and temperature on protein activity coefficients and solubility.
  • Demonstrated consistency between model predictions and existing literature.

Conclusions:

  • The UNIQUAC model provides an effective method for modeling protein activity coefficients in salt solutions.
  • Understanding these coefficients is key to optimizing protein solubility and biochemical processes.
  • The model's predictions align with experimental observations, validating its utility.