The Hofmeister series or lyotropic series is a classification of ions in order of their lyotrophic properties, which is the ability to salt out or salt in proteins. The effects of these changes were first worked out by Franz Hofmeister, who studied the effects of cations and anions on the solubility of proteins.
Hofmeister discovered a series of salts that have consistent effects on the solubility of proteins and (it was discovered later) on the stability of their secondary and tertiary structure. Anions appear to have a larger effect than cations, and are usually ordered
(This is a partial listing; many more salts have been studied.) The order of cations is usually given as
The mechanism of the Hofmeister series is not entirely clear, but does not seem to result from changes in general water structure, instead more specific interactions between ions and proteins and ions and the water molecules directly contacting the proteins may be more important. Recent simulation studies have shown that the variation in solvation energy between the ions and the surrounding water molecules underlies the mechanism of the Hofmeister series. More recently, a quantum chemical investigation suggests an electrostatic origin to the Hofmeister series. This work provides site-centred radial charge densities of the ions' interacting atoms (to approximate the electrostatic potential energy of interaction), and these appear to quantitatively correlate with many reported Hofmeister series for electrolyte properties, reaction rates and macromolecular stability (such as polymer solubility, and virus and enzyme activities).
Early members of the series increase solvent surface tension and decrease the solubility of nonpolar molecules ("salting out"); in effect, they strengthen the hydrophobic interaction. By contrast, later salts in the series increase the solubility of nonpolar molecules ("salting in") and decrease the order in water; in effect, they weaken the hydrophobic effect. The salting out effect is commonly exploited in protein purification through the use of ammonium sulfate precipitation.
However, these salts also interact directly with proteins (which are charged and have strong dipole moments) and may even bind specifically (e.g., phosphate and sulfate binding to ribonuclease A). Ions that have a strong 'salting in' effect such as I− and SCN− are strong denaturants, because they salt in the peptide group, and thus interact much more strongly with the unfolded form of a protein than with its native form. Consequently, they shift the chemical equilibrium of the unfolding reaction towards unfolded protein.
The denaturing of proteins by an aqueous solution containing many types of ions is more complicated as all the ions can act, according to their Hofmeister activity, i.e., a fractional number specifying the position of the ion in the series (given previously) in terms of its relative efficiency in denaturing a reference protein. The concept of Hofmeister ionicity Ih has been invoked by Dharma-wardana et al. where it is proposed to define Ih as a sum over all ionic species, of the product of the ionic concentration (mole fraction) and a fractional number specifying the "Hofmeister strength" of the ion in denaturing a given reference protein. The concept of ionicity (as a measure of the Hofmeister strength) used here has to be distinguished from ionic strength as used in electrochemistry, and also from its use in the theory of solid semiconductors 
- Hyde, Alan M.; Zultanski, Susan L.; Waldman, Jacob H.; Zhong, Yong-Li; Shevlin, Michael; Peng, Feng (2017). "General Principles and Strategies for Salting-Out Informed by the Hofmeister Series". Organic Process Research & Development. 21 (9): 1355–1370. doi:10.1021/acs.oprd.7b00197.
- Gregory, Kasimir P.; Elliott, Gareth R.; Robertson, Hayden; Kumar, Anand; Wanless, Erica J.; Webber, Grant B.; Craig, Vincent S. J.; Andersson, Gunther G.; Page, Alister J. (2022). "Understanding specific ion effects and the Hofmeister series". Physical Chemistry Chemical Physics. 24 (21): 12682–12718. doi:10.1039/D2CP00847E.
- Hofmeister, F (1888). "Zur Lehre von der Wirkung der Salze". Arch. Exp. Pathol. Pharmakol. 24 (4–5): 247–260. doi:10.1007/bf01918191. S2CID 27935821.
- Yang Z (2009). "Hofmeister effects: an explanation for the impact of ionic liquids on biocatalysis". Journal of Biotechnology. 144 (1): 12–22. doi:10.1016/j.jbiotec.2009.04.011. PMID 19409939.
- Zhang Y, Cremer PS (2006). "Interactions between macromolecules and ions: The Hofmeister series". Current Opinion in Chemical Biology. 10 (6): 658–63. doi:10.1016/j.cbpa.2006.09.020. PMID 17035073.
- M. Adreev; A. Chremos; J. de Pablo; J. F. Douglas (2017). "Coarse-Grained Model of the Dynamics of Electrolyte Solutions". J. Phys. Chem. B. 121 (34): 8195–8202. doi:10.1021/acs.jpcb.7b04297. PMID 28816050.
- M. Adreev; J. de Pablo; A. Chremos; J. F. Douglas (2018). "Influence of Ion Solvation on the Properties of Electrolyte Solutions". J. Phys. Chem. B. 122 (14): 4029–4034. doi:10.1021/acs.jpcb.8b00518. PMID 29611710.
- Kasimir P. Gregory; Erica J. Wanless; Grant B. Webber; Vince S. J. Craig; Alister J. Page (2021). "The Electrostatic Origins of Specific Ion Effects: Quantifying the Hofmeister Series for Anions". Chem. Sci. doi:10.1039/D1SC03568A.
- Chaplin, Martin (August 6, 2014). "Hofmeister Series". Water Structure and Science. London South Bank University. Archived from the original on August 2, 2014. Retrieved 2014-09-05.
- Choudhary, Nilesh; Kushwaha, Omkar Singh; Bhattacharjee, Gaurav; Chakrabarty, Suman; Kumar, Rajnish (2020-11-25). "Macro and Molecular Level Insights on Gas Hydrate Growth in the Presence of Hofmeister Salts". Industrial & Engineering Chemistry Research. 59 (47): 20591–20600. doi:10.1021/acs.iecr.0c04389. ISSN 0888-5885.
- Baldwin RL. (1996). "How Hofmeister ion interactions affect protein stability". Biophys J. 71 (4): 2056–63. Bibcode:1996BpJ....71.2056B. doi:10.1016/S0006-3495(96)79404-3. PMC 1233672. PMID 8889180.
- Dharma-wardana, M. W. C.; et al. (2014). "Chronic kidney disease of unknown aetiology and ground-water ionicity: study based on Sri Lanka". Environmental Geochemistry and Health. 37 (2): 221–231. doi:10.1007/s10653-014-9641-4. PMID 25119535. S2CID 37388540.
- Phillips, J. C. (1973). Bonds and Bands in Semi Conductors. New York: Academic.
- Ball, Philip (1999). H2O - A Biography of Water. London: Phoenix. p. 239. ISBN 0-7538-1092-1.
- Hofmeister Still Mystifies, Chemical & Engineering News, July 16, 2012.