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Related Concept Videos

Solution Formation02:16

Solution Formation

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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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Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
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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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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Temperature and cosolute regulate the liquid-liquid phase separation in BSA solutions.

Brigitte Merino Naranjo1, Erica Fuoco2, Rosa Bartucci1

  • 1Department of Physics, Molecular Biophysics Laboratory, University of Calabria, Rende, 87036, Italy.

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Summary

This study shows that polyethylene glycol (PEG) concentration influences the liquid-liquid phase separation (LLPS) temperature of bovine serum albumin (BSA). Lower PEG concentrations decrease the LLPS transition temperature for BSA solutions.

Keywords:
ATR-FTIRAlbuminLiquid-liquid phase separationOptical microscopyPEGTurbidity

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Area of Science:

  • Biochemistry
  • Biophysics
  • Cell Biology

Background:

  • Biomolecular condensates form in crowded cellular environments.
  • Liquid-liquid phase separation (LLPS) is a mechanism for condensate formation, observable in vitro.
  • Macromolecules with low structural complexity or disordered regions favor condensate formation.

Purpose of the Study:

  • To investigate bovine serum albumin (BSA) liquid-liquid phase separation (LLPS) induced by polyethylene glycol (PEG) and temperature.
  • To characterize the formation and properties of BSA droplets under varying conditions.

Main Methods:

  • Temperature-dependent turbidity measurements.
  • Optical microscopy for droplet visualization and size determination.
  • Infrared spectroscopy (ATR-FTIR) for real-time analysis and protein secondary structure assessment.

Main Results:

  • Lower PEG concentrations decreased the LLPS transition temperature of BSA solutions.
  • BSA droplet size decreased with increasing temperature (e.g., 9 μm at 10°C to 3 μm at 20°C at 10% PEG).
  • Droplets dissolved into a homogeneous phase at higher temperatures.
  • ATR-FTIR revealed a 50-fold higher protein concentration within droplets compared to the initial solution.
  • No changes in BSA secondary structure were observed within the condensates.

Conclusions:

  • Polyethylene glycol concentration and temperature are critical factors controlling BSA liquid-liquid phase separation.
  • BSA forms concentrated droplets without altering its secondary structure.
  • The findings provide insights into the biophysical mechanisms governing biomolecular condensate formation.