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Microfluidic Mixers for Studying Protein Folding
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Automatic In Situ Synthesis System for Polypeptide Biochip Based on Microfluidic Mixer.

Huanhuan Shi, Kaixuan Nie, Bo Dong

    IEEE Transactions on Nanobioscience
    |October 2, 2020
    PubMed
    Summary

    This study introduces an automated biochip synthesis system using microfluidics for efficient peptide backbone preparation. The novel system offers a low-cost, in situ alternative for biochip fabrication, enhancing accessibility in genetic analysis and biochemical sensing.

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    Area of Science:

    • Biotechnology
    • Chemical Engineering
    • Materials Science

    Background:

    • Biochips are vital for biochemical sensing and genetic analysis but face limitations due to complex preparation and high costs.
    • Existing methods for biochip fabrication are often cumbersome and expensive, hindering wider application.

    Purpose of the Study:

    • To develop an automated, cost-effective system for in situ biochip synthesis.
    • To overcome the limitations of traditional biochip preparation methods.

    Main Methods:

    • Utilized a microfluidic mixer for real-time carboxylic group activation and efficient monomer coupling.
    • Implemented a flow control system (PLC and LabVIEW) for automated, low-intervention synthesis.
    • Integrated a solar cell and UV absorption device for real-time process monitoring.
    • Validated photodeprotection efficiency using ultraviolet (UV) light for 2-(2-nitrophenyl) propyloxycarbonyl (NPPOC) group removal in N, N-dimethylformamide (DMF).

    Main Results:

    • Achieved efficient, real-time monomer coupling via microfluidic activation.
    • Demonstrated automated synthesis with minimal manual intervention.
    • Confirmed complete NPPOC group removal with 4 minutes of UV exposure (20 mW/cm², 365nm).
    • Synthesized a four-cycle aminocaproic acid peptide backbone with a 96% stepwise coupling yield, comparable to literature values.

    Conclusions:

    • The developed automated system enables low-cost, in situ biochip synthesis.
    • This microfluidic-based approach offers a viable alternative for producing peptide backbone biochips.
    • The system's efficiency and cost-effectiveness can broaden the application of biochips in various fields.