isoionic

https://doi.org/10.1351/goldbook.I03282
A macro-ion of a @[email protected] (in particular a protein) is said to be isoionic if besides the @[email protected] and H+ or OH ions (in general ions of the solvent) no other ions are present in the system.
Source:
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 618 [Terms] [Paper]