Secoiridoids and Xanthones in the genus Centaurium

Area of Science:

• Phytochemistry
• Natural Product Chemistry
• Pharmacognosy

Background:

• Centaurium spicatum (L.) Fritsch (Gentianaceae) is a plant species known for its medicinal properties.
• Secoiridoid glucosides are a class of compounds found in plants with various biological activities.
• Understanding the chemical composition of medicinal plants is crucial for their effective utilization.

Purpose of the Study:

• To investigate the content and profile of secoiridoid glucosides in Centaurium spicatum from different habitats.
• To identify and quantify major secoiridoid glucosides, specifically sweroside, swertiamarin, and gentiopicrin.
• To compare the phytochemical composition of C. spicatum with related species.

Main Methods:

• Overground plant parts of C. spicatum were collected from two distinct habitats.
• Isolation of secoiridoid glucosides using preparative column chromatography with silica gel.
• Chromatographic analysis employing newly developed Thin-Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC) systems.
• Spectroscopic analysis including Infrared (IR) and Mass spectrometry (MS) for structural elucidation.

Main Results:

• Sweroside was identified as the predominant secoiridoid glucoside in C. spicatum from both investigated habitats.
• Gentiopicrin was found in nearly equal amounts to sweroside in plant material from one habitat.
• Swertiamarin was consistently present as a minor component.
• Chemical derivation and spectroscopic data suggest sweroside is identical to 'kantaurin'.

Conclusions:

• Centaurium spicatum is a rich source of sweroside and gentiopicrin, with varying proportions depending on the habitat.
• The study provides a detailed phytochemical profile of C. spicatum regarding its secoiridoid glucoside content.
• Established TLC and HPLC methods are effective for the separation and analysis of these compounds.