Liquid chromatographic preparative method for isolating ergot alkaloids, using a particle-loaded membrane extracting...

Area of Science:

• Agricultural Chemistry
• Analytical Chemistry
• Food Safety

Background:

• Ergot alkaloids are toxic secondary metabolites produced by fungi that can contaminate cereal grains like wheat.
• Accurate and sensitive methods are required for the determination of ergot alkaloids in food products to ensure consumer safety.
• Existing methods may lack the sensitivity or specificity needed for reliable quantification in complex matrices like wheat.

Purpose of the Study:

• To develop and validate a robust liquid chromatographic method for the quantitative determination of key ergot alkaloids in wheat.
• To improve the extraction and cleanup efficiency for ergot alkaloids from wheat samples.
• To establish a sensitive and reliable analytical technique for ergot alkaloid analysis in food safety applications.

Main Methods:

• Extraction of ergot alkaloids using methanol-0.25% concentrated phosphoric acid (H3PO4) at pH 2.2.
• Cleanup and concentration of analytes using a strong cation-exchange solid-phase extraction (SPE) disk.
• Separation and detection by reversed-phase liquid chromatography with fluorescence detection.

Main Results:

• The SPE method effectively removed matrix interferences, concentrating the ergot alkaloids.
• Linear calibration curves were obtained for ergot alkaloids in the concentration range of 0.1-2.0 microg/mL.
• Mean recovery rates of 88.1% (CV 5.33%) were achieved at spiking levels relevant to food contamination.

Conclusions:

• The developed liquid chromatographic method with SPE cleanup is suitable for the accurate determination of ergot alkaloids in wheat.
• The method demonstrates good sensitivity, with limits of detection and quantitation below 5 ng/g and 20 ng/g, respectively.
• This analytical approach contributes to improved food safety monitoring for ergot alkaloid contamination in wheat-based products.