Can 2D-LC system be built by connecting two orthogonal columns with the use of two pumps and a switching valve? I want to build a tandem system myself. Is this practical?
Hi Farzaneh,
2D-LC is not as easy as it seems. I recommend you to search the available literature. Here is a small excerpt:
https://s3.amazonaws.com/academia.edu.documents/47728183/j.chroma.2009.08.07820160802-18600-1b04mjn.pdf?response-content-disposition=inline%3B%20filename%3DFlow_inconsistency_The_evil_twin_of_colu.pdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWOWYYGZ2Y53UL3A%2F20200218%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200218T074413Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&X-Amz-Signature=9f1de3d25ec478ad770dbdcea698e2e9a739e4083c6efeb95a9586a533a9a956
Article Two-Dimensional Liquid Chromatography: A State of the Art Tutorial
https://www.pragolab.cz/files/clanky/2020-01/2D_LC_app.pdf
https://www.sciencedirect.com/science/article/abs/pii/S0021967300816404
Article Column-switching Techniques for High-performance Liquid Chro...
Regards
Markus
Yes. Take a look on literaturw. Your concept is ok, but remember that you need to "inject" continously dractions from 1st D to 2nd D, thus the valve between the columns must have a loop (s) (read about modulation/modulators dor 2D LC)
Regards
GB
"Valve" between two columns does not need any loop. No need to inject continuous fractions unless application calls for it. Depends on what the goal and need is.
Once the primary methods have been optimized for use, most 2D HPLC methods are fully automated. *We have developed many custom 2D LC methods for major pharma companies over the past decades which were used for both initial analytical scale methods as well as in preparative scale-up methods for production.
You certainly can "build" your own 2D HPLC system yourself, but a detailed understanding of the flow path, the delay volumes, column volumes, application(s) and proposed methods are all required to make it work well (easier said than done). Best for highly skilled users with lots of method develop experience. This is a case where even having the best "tool" for the job is not enough because developing the best method to take advantage of it is the hardest part. In general, never use 2D HPLC to solve any problem, unless you have no other options. Practical to design your own system? Probably not.
Our company, Chiralizer Services, LLC offers the world's only stand-alone, dedicated 2D HPLC column switching system module. The 2D module can be used with any automated HPLC system creating a best 2D "tool" for this purpose (These are after all, just tools to help us accomplish a goal). It was designed by us back in the late 1980's, then made commercially available in the 1990's as the "The CS3020, Multi-dimensional 2-D Column Switching System™ ". Our CS3020 system allows you access to all possible flow paths, easy integration into an existing HPLC system and contact closure control for simple software integration/control. Only one HPLC gradient capable pump is needed. Valves and plumbing can be optimized for flow rate and delay volume to suit the application. Link: http://www.hplctools.com/switching.htm
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