Volumetric measurements in binary solvents: theory to experiment

Area of Science:

• Biochemistry
• Physical Chemistry
• Chemical Thermodynamics

Background:

• Protein-cosolvent interactions are crucial for understanding protein stability and function.
• Volumetric techniques provide sensitive measures of these interactions but have historically faced experimental and theoretical limitations.
• Despite challenges, volumetric methods are re-emerging as valuable tools in studying protein solutions.

Purpose of the Study:

• To review recent theoretical and experimental advancements in applying volumetric techniques to protein solutions in binary mixtures.
• To highlight the growing interest and renewed application of volumetric approaches in this field.
• To provide a strategy for future volumetric studies to deepen the understanding of protein-osmolyte interactions.

Main Methods:

• Review of existing literature on volumetric studies of protein-cosolvent systems.
• Analysis of theoretical frameworks for interpreting volumetric data in terms of solute-solvent and solute-cosolvent interactions.
• Discussion of experimental methodologies and their recent improvements for volumetric measurements at high cosolvent concentrations.

Main Results:

• Volumetric properties are sensitive indicators of the full range of solute-solvent and solute-cosolvent interactions.
• Recent theoretical developments provide a framework for rationalizing volumetric results.
• Experimental techniques have advanced, enabling more reliable measurements in complex mixtures.
• A revival of interest in volumetric approaches for protein solutions is evident.

Conclusions:

• Volumetric techniques, despite past limitations, are increasingly valuable for characterizing protein-cosolvent interactions.
• Future volumetric studies, guided by recent theoretical and experimental progress, promise new insights into protein behavior with protecting and denaturing osmolytes.
• This review underscores the potential of volumetric methods to elucidate fundamental aspects of protein hydration and osmolyte effects.