Analysis of lignans using micellar electrokinetic chromatography

Area of Science:

• Analytical Chemistry
• Chromatography
• Natural Product Analysis

Background:

• Phyllanthus plants contain diverse lignan compounds with potential bioactivity.
• Accurate separation and identification of lignans are crucial for their analysis.
• Micellar electrokinetic chromatography (MEKC) is a powerful separation technique.

Purpose of the Study:

• To compare the efficacy of two micellar systems, sodium dodecyl sulfate (SDS) and sodium deoxycholate (SDC), for lignan separation.
• To investigate the influence of micellar composition on lignan retention mechanisms.
• To validate a method for quantifying lignans in Phyllanthus plant extracts.

Main Methods:

• Micellar electrokinetic chromatography (MEKC) was employed.
• Two micellar systems were tested: SDS with tetrahydrofuran and SDC without organic modifiers.
• Lignan compounds from Phyllanthus plants were analyzed.
• Method validation was performed for quantitative analysis.

Main Results:

• Both SDS and SDC micellar systems provided satisfactory separation of lignans within a reasonable time.
• The SDS system required tetrahydrofuran due to high lignan lipophilicity, while SDC did not.
• Selectivity and retention mechanisms differed significantly: SDC-MEKC was dominated by hydrophobicity, SDS-MEKC by hydrogen bonding.
• The SDS method was validated for quantifying lignans in two Phyllanthus species.

Conclusions:

• SDC-MEKC offers an effective, organic-solvent-free approach for lignan separation based on hydrophobicity.
• SDS-MEKC, with the addition of an organic solvent, provides an alternative separation mechanism influenced by hydrogen bonding.
• Both methods demonstrate utility in analyzing lignans from Phyllanthus plants, with distinct separation characteristics.