Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.187801
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Funding
- NSF [DMR-1611497]
- U.S. DOE National Nuclear Security Administration [DE-NA-0003525]
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The configuration of charged polymers is heavily dependent on interactions with surrounding salt ions, typically manifesting as a sensitivity to the bulk ionic strength. Here, we use single-molecule mechanical measurements to show that a charged polysaccharide, hyaluronic acid, shows a surprising regime of insensitivity to ionic strength in the presence of trivalent ions. Using simulations and theory, we propose that this is caused by the formation of a jacket of ions, tightly associated with the polymer, whose charge (and thus effect on configuration) is robust against changes in solution composition.
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