chiral additive

https://doi.org/10.1351/goldbook.09952
Chiral selector that has been added as a component of a mobile phase or electrophoretic medium.
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 207 (https://doi.org/10.1515/pac-2017-0111)