High Resolution GC/MS Analysis of Ginkgolic Acids in Ginkgo biloba Plants, Extracts, and Dietary Supplements Using the Agilent 5975C Series GC/MSD

Importance of the Topic

Quantitative and qualitative analysis of ginkgolic acids in Ginkgo biloba products is critical due to their potential toxic and bioactive properties. High-resolution separation and reliable identification support quality control, safety assessment, and authentication of plant materials and supplements.

Objectives and Study Overview

The study aimed to develop and validate a gas chromatography–mass spectrometry method with superior resolving power compared to HPLC for detection of ginkgolic acid isomers in Ginkgo biloba leaves, seeds, extracts, and dietary supplements. It further sought to pinpoint double bond positions using ozonolysis and to use isomer ratios to infer plant part origin in commercial products.

Methodology

Sample preparation included exhaustive extraction of leaves, seeds, sarcotesta, and supplements followed by derivatization with trimethylsulfonium hydroxide. Separation was achieved on an Agilent J&W HP-88 column (30 m × 0.25 mm, 0.25 μm) under a programmed temperature gradient. Detection employed electron ionization at 70 eV with scan and selected ion monitoring at m/z 161 for enhanced specificity.

Used Instrumentation

• Gas chromatograph: Agilent 7890 GC with 7693A automatic liquid sampler
• Mass spectrometer: Agilent 5975C Series GC/MSD
• Analytical column: Agilent J&W HP-88 (88% cyanopropyl) arylpolysiloxane
• Reagents: Standard ginkgolic acids (C13:0, C15:0, C15:1, C17:1), anthracene as internal standard, TMSH for derivatization

Main Results and Discussion

The method achieved baseline separation of close isomeric pairs such as C13:0/C15:1 and C15:0/C17:1, with intraday RSDs of 1.3–2.1% and interday RSD of 3.8%. Limits of detection and quantitation were 0.5 μg/mL and 1.5 μg/mL, respectively. Ozonolysis confirmed the presence of specific double bond isomers (C15:1 D8 in standards and plant samples; C17:1 primarily D12 isomer). Analysis of 19 plant samples and 21 supplements revealed total GA concentrations ranging from 3 to 534 ppm, with leaves exhibiting the highest levels. The C15:1 D10/D8 ratio distinguished leaf-derived products (ratio 1–3) from seeds and sarcotesta (ratio 0.1–0.5).

Benefits and Practical Applications

This GC/MS approach provides precise isomeric resolution and quantitation not attainable by HPLC, enabling rigorous quality control of Ginkgo biloba materials, detection of adulteration, and determination of plant part origin in supplements.

Future Trends and Applications

Further development may extend the method to other bioactive alkylsalicylic acids, integrate high-throughput sample handling, and support regulatory standards for herbal products. Coupling with advanced software could automate spectral interpretation and isomer assignment.

Conclusion

The validated high-resolution GC/MS method reliably separates, identifies, and quantifies ginkgolic acid isomers, offering a powerful tool for the safety and authenticity assessment of Ginkgo biloba products.

References

1. Wang M., Zhao J., Avula B., Wang Y.-H., Avonto C., Chittiboyina A. G., Parcher J. F., Khan I. A. High-resolution gas chromatography/mass spectrometry method for characterization and quantitative analysis of ginkgolic acids in Ginkgo biloba plants, extracts, and dietary supplements. J. Agric. Food Chem. 62, 12103–12111 (2014).