The simulation shows how different ions, placed along the classic Hofmeister series from strongly kosmotropic (salting-out) to strongly chaotropic (salting-in), change the solubility and aggregation behavior of a model protein in solution, letting you visually compare the old bulk-water explanation with the modern local-surface-interaction view.
Select an anion or cation from the series using the slider or dropdown, adjust the salt concentration, and observe how the model protein particles respond, either clustering together and precipitating (salting out) or remaining dispersed and stable (salting in). Toggle between a bulk-water-structure visualization and a local-surface-interaction visualization to compare the two proposed mechanisms side by side.
Ion selector (cation/anion dropdown spanning the Hofmeister series), salt concentration slider, mechanism-view toggle (bulk water structure vs. local surface interaction), and a play/reset control for the precipitation animation.
Did you know Hofmeister never actually measured any water structure at all? His entire 1888 ranking came purely from observing how much salt was needed to precipitate egg-white protein, and it took over a hundred years and the invention of femtosecond laser spectroscopy before scientists could directly test, and largely overturn, the water-structuring explanation people had assumed was correct.
The simulation shows how different ions, placed along the classic Hofmeister series from strongly kosmotropic (salting-out) to strongly chaotropic (salting-in), change the solubility and aggregation behavior of a model protein in solution, letting you visually compare the old bulk-water explanation with the modern local-surface-interaction view.
The simulation shows how different ions, placed along the classic Hofmeister series from strongly kosmotropic (salting-out) to strongly chaotropic (salting-in), change the solubility and aggregation behavior of a model protein in solution, letting you visually compare the old bulk-water explanation with the modern local-surface-interaction view.
Select an anion or cation from the series using the slider or dropdown, adjust the salt concentration, and observe how the model protein particles respond, either clustering together and precipitating (salting out) or remaining dispersed and stable (salting in). Toggle between a bulk-water-structure visualization and a local-surface-interaction visualization to compare the two proposed mechanisms side by side.
Did you know Hofmeister never actually measured any water structure at all? His entire 1888 ranking came purely from observing how much salt was needed to precipitate egg-white protein, and it took over a hundred years and the invention of femtosecond laser spectroscopy before scientists could directly test, and largely overturn, the water-structuring explanation people had assumed was correct.