Speciation of selenium through chromatography with atomic techniques.

Area of Science:

• Analytical Chemistry
• Environmental Science
• Biochemistry

Background:

• Selenium is an essential element with a narrow therapeutic window, necessitating understanding its chemical forms.
• Different selenium species (e.g., selenomethionine, methylselenocysteine) possess distinct toxicological and bioavailability profiles.
• Total selenium content is insufficient for assessing its biological impact and environmental fate.

Purpose of the Study:

• To review 21st-century advancements in selenium speciation using chromatographic and atomic techniques.
• To highlight the importance of speciation for evaluating selenium toxicity, bioavailability, and biotransformation.
• To discuss challenges and future directions in selenium speciation analysis.

Main Methods:

• Literature review of studies published in the 21st century.
• Focus on combinations of chromatographic techniques (HPLC, GC) and atomic detection methods (ICP-MS, AAS, AFS).
• Discussion of sample preparation, separation strategies, and detector performance.

Main Results:

• Chromatography-atomic technique combinations offer high resolution and sensitivity for selenium speciation.
• Applications span food, biological, and environmental matrices, crucial for risk assessment.
• Established methods effectively analyze various selenium species, but challenges persist.

Conclusions:

• Accurate selenium speciation is fundamental for understanding its role in health and the environment.
• Challenges include low analyte concentrations, species interconversion, and complex sample matrices.
• Selenium speciation remains a dynamic field critical for analytical chemistry and toxicological studies.