Capillary electrophoretic analysis of neutral carbohydrates using ionic liquids as background electrolytes

Area of Science:

• Analytical Chemistry
• Separation Science

Background:

• Capillary electrophoresis (CE) is a powerful separation technique.
• Analysis of neutral carbohydrates often requires derivatization for detection.
• Indirect UV detection is an alternative for analytes lacking UV absorbance.

Purpose of the Study:

• To investigate the use of ionic liquids (ILs) as background electrolyte (BGE) additives in CE for the analysis of neutral carbohydrates.
• To evaluate the impact of imidazolium-based ILs on separation, detection limits, and analyte mobility.
• To develop a method for the rapid separation and determination of underivatized neutral sugars.

Main Methods:

• Capillary electrophoresis (CE) with indirect UV detection.
• Use of imidazolium-based ionic liquids (ILs) as BGE additives.
• Optimization of IL concentration and pH for separation.
• Analysis of neutral carbohydrates (sucrose, glucose, fructose).

Main Results:

• Ionic liquids effectively served as chromophores for indirect UV detection.
• BGEs containing 10-50 mM ILs at pH 12.4 facilitated fast separation of neutral sugars without other additives.
• The method demonstrated applicability for determining sucrose, glucose, and fructose in vegetable juice samples.

Conclusions:

• Ionic liquids are effective additives for indirect UV detection in CE analysis of neutral carbohydrates.
• The developed CE method offers a fast and efficient approach for sugar determination.
• This technique provides a valuable tool for analyzing neutral carbohydrates in complex matrices like food products.