Inorganic selenium speciation analysis in Allium and Brassica vegetables by ionic liquid assisted liquid-liquid...

Area of Science:

• Analytical Chemistry
• Environmental Science
• Food Chemistry

Background:

• Accurate selenium speciation is crucial for understanding its biological role and environmental fate.
• Traditional methods for selenium speciation can be complex and lack sensitivity for trace levels in food matrices.

Purpose of the Study:

• To develop a highly sensitive and efficient method for inorganic selenium speciation in Allium and Brassica vegetables.
• To optimize extraction conditions for maximizing selenium recovery and preconcentration.

Main Methods:

• Development of a vortex assisted liquid-liquid microextraction (VA-LLME) using a phosphonium ionic liquid and ammonium pyrrolidine dithiocarbamate (APDC).
• Optimization of graphite furnace temperature program and multivariate statistical analysis for extraction efficiency.
• Determination of selenium using electrothermal atomic absorption spectrometry (ETAAS).

Main Results:

• Achieved high extraction efficiency (90%) for inorganic selenium species.
• Obtained a significant preconcentration factor of 100-fold.
• Reached a low detection limit of 5.0 ng/L for selenium.

Conclusions:

• The developed IL-VA-LLME method provides a sensitive and efficient approach for selenium speciation in complex vegetable matrices.
• The method offers non-chromatographic separation, simplifying analysis.
• This technique is advantageous for accurate selenium determination in garlic, onion, leek, broccoli, and cauliflower.