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"Click dipeptide": a novel stationary phase applied in two-dimensional liquid chromatography
Meiyun Xue1, Hongxue Huang, Yanxiong Ke
1Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Journal of Chromatography. A
|October 30, 2009
Summary
A novel Click dipeptide stationary phase was developed for two-dimensional High-Performance Liquid Chromatography (2D-HPLC). This new phase offers high orthogonality with C18, enhancing complex sample separation for applications like traditional Chinese medicine analysis.
Area of Science:
- Analytical Chemistry
- Chromatography
- Materials Science
Background:
- Two-dimensional High-Performance Liquid Chromatography (2D-HPLC) is crucial for complex sample separation.
- Developing novel stationary phases is key to achieving high orthogonality in 2D-LC systems.
- Orthogonality in 2D-LC enhances separation power by utilizing different separation mechanisms.
Purpose of the Study:
- To synthesize and characterize a novel dipeptide-based stationary phase for 2D-HPLC.
- To evaluate the orthogonality and separation performance of the new stationary phase against a conventional C18 phase.
- To demonstrate the utility of the developed 2D-LC system for analyzing complex natural product samples.
Main Methods:
- Synthesis of an alpha-azido l-phenylglycine dipeptide using imidazole-1-sulfonyl azide hydrochloride.
- Immobilization of the azido dipeptide onto alkyne-silica via click chemistry.
- Characterization of the novel stationary phase using FT-IR, solid-state CP/MAS (13)C NMR, and elemental analysis.
- Development of an off-line 2D-Reversed-Phase/Reversed-Phase Liquid Chromatography (2D-RP/RPLC) system.
- Analysis of a Traditional Chinese Medicine (TCM) sample (Rheum Palmatum L.).
Main Results:
- Successful synthesis and characterization of the Click dipeptide stationary phase.
- Demonstrated high orthogonality (63.5%) between the Click dipeptide and C18 stationary phases.
- The 2D-LC system exhibited excellent separation power for the complex TCM sample.
- The novel stationary phase proved effective in separating complex mixtures.
Conclusions:
- The novel Click dipeptide stationary phase offers high orthogonality, significantly improving 2D-LC separation capabilities.
- This new material provides a valuable tool for the analysis of complex samples, including natural products.
- The developed 2D-LC method using the Click dipeptide phase is effective for practical applications in chemical analysis.
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