Analysis of Oxymatrine and Matrine in Sophora

Significance of the Topic

Oxymatrine and matrine are two major alkaloids found in Sophora root products commonly used in traditional medicine. Their pharmacological properties, including anti-inflammatory and anti-cancer effects, make accurate quantification essential for quality control and safety assurance in herbal preparations.

Objectives and Overview of the Study

The aim of this study was to establish a reliable reversed-phase liquid chromatography method for simultaneous determination of oxymatrine and matrine in Sophora powder. Using a Shim-pack GIST C18 column and gradient elution with UV detection, the method was evaluated for its separation efficiency and applicability to real samples.

Methodology

Sample pre-treatment and chromatographic separation steps were optimized to ensure reproducibility and sensitivity.

1. Commercial Sophora powder was sieved, weighed (0.3 g) and transferred to a flask.
2. Ammonia solution and chloroform were added; the mixture was ultrasonically extracted at 250 W, 33 kHz for 40 minutes.
3. The extract was filtered, evaporated to dryness and residues were redissolved in absolute ethanol to a final volume of 10 mL.

• Column: Shim-pack GIST C18 (250 × 4.6 mm, 5 µm).
• Mobile phase: 0.01 M ammonium acetate with ammonium hydroxide (pH 8.1) (A) and acetonitrile (B); gradient from 0% to 60% B over 50 min.
• Flow rate: 1.0 mL/min; column temperature: 20 °C; detection: UV at 225 nm; injection volume: 5 µL for standard and 7 µL for sample.

Used Instrumentation

• High-performance liquid chromatograph equipped with Shim-pack GIST C18 column.
• Ultrasonic cleaner (250 W, 33 kHz) for extraction.
• LabTotal Vials for LC/LCMS (Shimadzu).

Main Results and Discussion

The developed method achieved clear baseline separation of oxymatrine and matrine, as evidenced by distinct peaks in standard mixes and sample chromatograms. Both analytes were detected at 50 µg/mL with satisfactory resolution, demonstrating the method’s suitability for routine analysis of Sophora extracts.

Benefits and Practical Applications of the Method

This procedure provides:

• High selectivity and accuracy for alkaloid quantification.
• Reproducible sample preparation using common laboratory equipment.
• Applicability to quality control of herbal medicine formulations.

Future Trends and Potential Applications

Advances such as UHPLC, integration with mass spectrometry and automated sample handling can further reduce analysis time and increase sensitivity. Green solvent approaches and miniaturized formats may enhance environmental sustainability and field deployment.

Conclusion

The reversed-phase LC method described offers a robust and practical approach for simultaneous determination of oxymatrine and matrine in Sophora products, facilitating reliable quality assessment in herbal medicine quality control.

References

• Shimadzu Corporation. Analysis of Oxymatrine and Matrine in Sophora. First Edition: Mar. 2023, ERAS-1000-0006.