Reversed-phase high-performance liquid chromatography of catecholamines and indoleamines using a simple gradient...

Area of Science:

• Analytical Chemistry
• Biochemistry

Background:

• Accurate separation and quantification of biogenic amines and amino acids are crucial in biological research.
• Existing chromatographic methods may involve complex mobile phases or leave interfering residues.

Purpose of the Study:

• To develop a novel reversed-phase High-Performance Liquid Chromatography (HPLC) method for the simultaneous separation of a range of important biomolecules.
• To establish a method with simplified post-separation processing by utilizing volatile mobile phases.

Main Methods:

• Reversed-phase High-Performance Liquid Chromatography (HPLC) utilizing a C18 column.
• A two-mobile-phase gradient elution system composed of volatile components: Mobile phase A (0.05% trifluoroacetic acid in aqueous methanol) and Mobile phase B (0.05% trifluoroacetic acid in methanol).
• Detection by native fluorescence (excitation at 220 nm, emission at 320 nm).

Main Results:

• Successful separation of norepinephrine, octopamine, epinephrine, dopamine, dihydroxyphenylalanine, tyramine, tyrosine, serotonin, 5-hydroxytryptophan, N-acetyl-serotonin, and tryptophan.
• Demonstrated advantage of complete mobile phase removal without salt residues, facilitating subsequent analyses.
• Established a sensitivity range of 2.5 to 25 pmol, with potential for extension.

Conclusions:

• The developed HPLC method offers an efficient and simplified approach for analyzing a panel of biogenic amines and amino acids.
• The volatile mobile phase system enhances downstream analytical procedures by eliminating salt contamination.
• The method's reliance on structural characteristics for elution prediction aids in identifying unknown components.