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Assessment of pulsed dielectrophoretic-field flow fractionation separation coupled with fibre-optic detection on a lab-on-chip as a technique to separate similar bacteria cells

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Abstract

This study addresses the challenge of separating bacteria with similar structures such as Escherichia coli and Aeromonas hydrophila. This approach employs pulsed field dielectrophoresis assisted by laminar flow fractionation in a lab-on-a-chip system with integrated optical detection. Bacterial cells passed through 30-µm microelectrodes subjected at 1 MHz and 14 V peak-to-peak in pulsed mode, while fluid flow carried bacteria towards the chamber’s end. The on-and-off electric field at specific pulse intervals expose bacterial cells to diverse forces, including kinetics, dielectrophoresis, gravity, drag, and diffusion, resulting in a net force facilitating their movement. Variations of pulsing time, flow rates, and voltage were investigated to identify the optimal combination for efficient separation. Next, the bacteria were detected using an optical fibre based on their absorbance. Results demonstrated a 30% separation efficiency in 90 min at 9.6 μL min−1 flow rates, 4 s pulsing time, and 40 μS cm−1 medium conductivity. A. hydrophila aggregates experienced greater DEP force and retained at microelectrodes during electric field application compared to E. coli, which moved faster towards optical detection. The separation mechanism with and without electric field was different, and precise control of cell movement during field-off periods is important to minimize uncontrolled diffusion. While the optical detection part has been successful, longer time and separation length are recommended for better separation. A carefully tuned combination of pulsing time, flow rates, voltage, and microelectrode design is crucial for this integrated lab-on-chip system to be efficient for separating and detecting closely related microorganisms.

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Acknowledgements

We would like to thank Malaysia Ministry of Science, Technology, and Innovation for funding this project (SF-02-01-04-SF1214), Majlis Amanah Rakyat (MARA) for providing student financial assistance, Dr. Zalini Yunus from Science and Technology Research Institute for Defence (STRIDE), Malaysia Ministry of Defence for providing the microbes and Mr. Ashaari Yusof from TM R&D, Malaysia for providing the technical assistance.

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Authors and Affiliations

  1. Kolej Kemahiran Tinggi Mara Kemaman, Jalan Mak Lagam, 24000, Kemaman, Terengganu, Malaysia

    Mohd Firdaus Kamuri

  2. Department of Chemical and Environmental Engineering, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Zurina Zainal Abidin

  3. Department of Computer and Communications Engineering, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Mohd Hanif Yaacob

  4. Department of Electrical and Electronic Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia

    Mohd Nizar Hamidon

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  1. Mohd Firdaus Kamuri
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Correspondence to Zurina Zainal Abidin.

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Kamuri, M.F., Abidin, Z.Z., Yaacob, M.H. et al. Assessment of pulsed dielectrophoretic-field flow fractionation separation coupled with fibre-optic detection on a lab-on-chip as a technique to separate similar bacteria cells. Biotechnol Bioproc E 29, 141–156 (2024). https://doi.org/10.1007/s12257-024-00001-z

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