Chromatography using a water stationary phase and a carbon dioxide mobile phase
Michael O Fogwill1, Kevin B Thurbide
1Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada.
Analytical Chemistry
|November 16, 2010
Summary
A new chromatography method uses water as a stationary phase and carbon dioxide (CO2) as a mobile phase for green separations. This innovative technique offers robust, reproducible, and efficient analysis of various compounds.
Area of Science:
- Analytical Chemistry
- Separation Science
- Green Chemistry
Background:
- Traditional chromatography often relies on organic solvents, posing environmental and safety concerns.
- Developing environmentally friendly separation techniques is crucial for sustainable analytical practices.
Purpose of the Study:
- To introduce a novel chromatographic separation method utilizing water and carbon dioxide (CO2).
- To demonstrate the method's effectiveness for analyzing various organic compounds and its applicability in real-world samples.
Main Methods:
- Employing water (saturated with CO2) as the stationary phase and CO2 (saturated with water) as the mobile phase in an uncoated stainless steel capillary.
- Manipulating temperature and pressure to control mobile phase density and stationary phase polarity for optimized separations.
- Utilizing universal flame ionization detection due to the absence of organic components.
Main Results:
- Achieved excellent sample capacity, peak symmetry, and reproducible retention times (∼1% RSD run-to-run, ∼4% RSD day-to-day).
- Successfully analyzed analytes including alcohols, carboxylic acids, phenols, and tocopherols.
- Quantified ethanol in beverages and biofuels and analyzed caffeine levels in drinks with high accuracy and speed.
Conclusions:
- This water-CO2 chromatographic system is an inexpensive, robust, and environmentally compatible alternative to traditional methods.
- The method allows for gradient programming and requires minimal sample preparation, offering quick throughput.
- It provides a versatile platform for the analysis of diverse analytes in various matrices.
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