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    Area of Science:

    • Analytical Chemistry
    • Biotechnology
    • Bioprocess Engineering

    Background:

    • Microchip capillary electrophoresis (CE) coupled with high pressure mass spectrometry (HPMS) is a powerful analytical technique.
    • Previous iterations of the CE-HPMS platform had limitations in sensitivity and ion transmission.

    Purpose of the Study:

    • To enhance the performance of a CE-HPMS platform for improved detection and monitoring.
    • To demonstrate the utility of the improved platform for analyzing biological samples.

    Main Methods:

    • Increased RF drive frequency to over 30 MHz.
    • Scaled down ion trap critical dimensions to 100 μm.
    • Implemented a stretched length ion trap and a tube lens for enhanced sensitivity and ion transmission.

    Main Results:

    • Achieved an average signal-to-noise improvement of 28 times for 20 common amino acids.
    • Reduced average peak width by 2.6 times compared to previous work.
    • Successfully monitored real-time amino acid consumption rates by cells in growth media.

    Conclusions:

    • The enhanced CE-HPMS platform offers significantly improved performance for amino acid analysis.
    • The platform is suitable for real-time monitoring of cellular metabolism in bioreactors.
    • This advancement has potential applications in bioprocess optimization and metabolic studies.