Flow inconsistency: The evil twin of column switching-Hardware aspects

Eduard Rogatsky, Kara Braaten, Greg Cruikshank, Harsha Jayatillake, Bing Na Zheng, Daniel T. Stein

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Solvent flow, generated by HPLC pumps is consistent and accurate. This statement, while true for single column (one dimensional) liquid chromatography applications, may not apply to column switching applications. Connection of pumps and/or columns to one flow path may cause substantial pressure changes. Immediate post valve switch pressure differences between pumps can cause backflow where the mobile phase stored at higher pressure will temporary flow into the lower pressure area. A more common side effect of column switching is flow inconsistency during pump pressurization. For the duration of pump pressurization, liquid flow through the column will be smaller than expected since the HPLC column acts like a flow restrictor.

Original languageEnglish (US)
Pages (from-to)7721-7727
Number of pages7
JournalJournal of Chromatography A
Issue number45
StatePublished - Nov 6 2009


  • Column switching
  • Dead (delay) volume
  • Flow inconsistency
  • Focus mode
  • Pressurization
  • Turbulent flow chromatography

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


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