09951 IUPAC Gold Book - type-J synchronous planetary motion 10.1351/goldbook.09951 09951 current 1 Unique type of planetary motion (so named because the flow tubes form a letter J figure, as shown in the figure in high-speed counter-current chromatography) of the column holder, which rotates around its own axis once during one revolution around the central axis of the centrifuge in the same direction. The system prevents the flow tubes from twisting during column rotation, and produces an excellent mixing and high retention of the stationary phase in a multilayer coil separation column. 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 205 (https://doi.org/10.1515/pac-2017-0111) https://goldbook.iupac.org/terms/view/09951/html https://goldbook.iupac.org/terms/view/09951/json https://goldbook.iupac.org/terms/view/09951/plain Citation: 'type-J synchronous planetary motion' 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.09951 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. 2026-07-25T15:22:02+00:00