Surface functionalization of a microfluidic biosensor for bacteria detection and identification

Douglas A. Boehm; Philip Gottlieb; Susan Z. Hua

doi:10.1117/12.714441

6 April 2007 Surface functionalization of a microfluidic biosensor for bacteria detection and identification

Douglas A. Boehm, Philip Gottlieb, Susan Z. Hua

Proceedings Volume 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007; 65290H (2007) https://doi.org/10.1117/12.714441
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

Rapid identification and detection of bacteria is an important issue in environmental and food science. We have developed an impedance-based method to simultaneously identify and detect bacteria in a derivatized microfluidic chamber with monoclonal antibodies. The presence of bacteria in the solution can be selectively recognized and fixed on the chamber wall and detected via impedance change in real time. The optimum reaction time between antibody and bacteria has been estimated using a simple model and evaluated experimentally. Various concentrations of cultured E. coli cells ranging from 10⁵ to 10⁸ CFU/ml were tested using the biosensor. By taking the advantage of a microfluidic system, the bacteria can be concentrated and accumulated on the chamber wall by continuously perfusing the chamber with bacterial suspension, therefore, enhancing the detection limit of the sensor. Using this approach, the biosensor was able to detect 10⁶ CFU/ml E. coli (BL21(DE3)) via five consecutive perfusions. The selectivity of the sensor is demonstrated by testing the antibody reaction for two bacteria stains, E. coli and M. catarrhalis. By derivatizing the chamber walls with specific antibodies, we can clearly identify the bacteria that are specific to the antibodies in the detection chamber. The simplicity of the technique also makes the device portable and ideal for clinical and field applications.

Citation Download Citation

Douglas A. Boehm, Philip Gottlieb, and Susan Z. Hua "Surface functionalization of a microfluidic biosensor for bacteria detection and identification", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65290H (6 April 2007); https://doi.org/10.1117/12.714441

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