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Post Column Derivatization Using Reaction Flow High Performance Liquid Chromatography Columns
Published on: April 26, 2016
Combination of column temperature gradient and mobile phase flow gradient in microcolumn and capillary column
F Houdiere1, P W Fowler, N M Djordjevic
1Novartis Pharma Inc., Pharma Discovery, Building 503/1106, Basle CH-4002, Switzerland.
Analytical Chemistry
|June 7, 2011
Summary
Simultaneous flow and temperature gradients in High-Performance Liquid Chromatography (HPLC) analysis significantly reduce analysis time by up to 50% without compromising separation efficiency. This combined gradient method offers high reproducibility, making it ideal for capillary HPLC.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Gradient elution in High-Performance Liquid Chromatography (HPLC) typically involves changes in mobile phase composition, temperature, or flow rate.
- The combined use of multiple gradient modes, specifically flow and temperature programming, is less common in HPLC analysis.
Purpose of the Study:
- To compare separation performance using simultaneous flow and temperature gradients versus conventional isocratic/isothermal conditions in capillary and microcolumn HPLC.
- To evaluate the impact of combined gradients on analysis time, separation efficiency, and reproducibility.
Main Methods:
- Utilized simultaneous flow and temperature programming in capillary and microcolumn HPLC.
- Compared results against isocratic, isothermal, and isorheic (constant flow) separation conditions.
- Assessed separation efficiency and reproducibility (relative standard deviation).
Main Results:
- Simultaneous flow and temperature gradients reduced analysis time by up to 50% while maintaining separation efficiency.
- Achieved high reproducibility (RSD < 2.0%), comparable to mobile phase gradients.
- Demonstrated the effectiveness of combined gradients for capillary HPLC, overcoming challenges of solvent gradient elution.
Conclusions:
- Combined flow and temperature programming is an effective strategy for optimizing HPLC separations.
- This method offers significant advantages in terms of speed and reproducibility, particularly for capillary HPLC systems.
- It presents a viable alternative to solvent gradient elution in challenging capillary HPLC applications.
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