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Related Concept Videos

Solubility03:00

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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There is no one solvent that can dissolve every type of solute. Some substances that readily dissolve in a certain solvent might be insoluble in a different solvent. A simple way to predict which substances dissolve in which solvent is the phrase "like dissolves like". This means that polar substances, such as salt and sugar, dissolve in a polar substance like water. In contrast, non-polar substances are more soluble in non-polar solvents such as carbon tetrachloride.
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Organic Solvent-Based Protein Precipitation for Robust Proteome Purification Ahead of Mass Spectrometry
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Organic Solvent-Based Protein Precipitation for Robust Proteome Purification Ahead of Mass Spectrometry

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Proteins in binary solvents.

Francesco Spinozzi1, Paolo Mariani2, Maria Grazia Ortore2

  • 1Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy. f.spinozzi@univpm.it.

Biophysical Reviews
|May 17, 2017
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Summary
This summary is machine-generated.

Understanding protein hydration in complex solutions is key to biological processes. Cosolvents alter protein structure and dynamics by modifying the hydration layer, crucial for protein stability and function.

Keywords:
DSCPreferential solvationProtein–protein interactionProtein–solvent interactionSANSSAXS

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Area of Science:

  • Biophysics
  • Structural Biology
  • Physical Chemistry

Background:

  • Proteins exist in aqueous solutions, surrounded by a structured hydration layer that influences their stability and dynamics.
  • Biological fluids are complex mixtures, making the study of protein solvation in these environments critical for understanding biological functions.
  • Cosolvents can significantly alter protein hydration shells, impacting overall protein structure and dynamics.

Purpose of the Study:

  • To review recent studies on the structural and thermodynamic properties of model proteins in binary solvent mixtures.
  • To elucidate the role of the protein solvation shell in mixed solvents and its impact on protein characteristics.
  • To highlight the importance of understanding protein hydration in complex biological solutions.

Main Methods:

  • Small-angle neutron scattering (SANS) with contrast variation to analyze protein structure and solvation shell composition.
  • Differential scanning microcalorimetry (DSC) to determine thermodynamic properties.

Main Results:

  • SANS experiments provide direct insights into protein structure and the composition of the solvation shell (solvent/cosolvent).
  • DSC experiments yield comprehensive thermodynamic data related to protein behavior in solution.
  • Analysis reveals specific characteristics of the protein solvation layer in different binary aqueous mixtures.

Conclusions:

  • Investigating protein structure and thermodynamics in binary aqueous mixtures is essential for understanding hydration's role in protein stability and activity.
  • The thermodynamic model for water-cosolvent equilibria in the solvation shell provides a framework for analysis.
  • Protein surface interactions with the solvation shell are crucial for biological processes.