09943 IUPAC Gold Book - elution mode 10.1351/goldbook.09943 09943 current 1 Method of introduction of the mobile phase (upper or lower) into the rotating coil (from the head or the tail). Of four combinations, only two elution modes should be used in high-speed counter-current chromatography, i.e. either the lower phase from the head toward the tail or the upper phase from the tail toward the head. high-speed counter-current chromatography https://goldbook.iupac.org//terms/view/09944 PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 203 (https://doi.org/10.1515/pac-2017-0111) https://goldbook.iupac.org/terms/view/09943/html https://goldbook.iupac.org/terms/view/09943/json https://goldbook.iupac.org/terms/view/09943/plain Citation: 'elution mode' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.09943 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-04-19T07:40:01+00:00