, Volume 55, Issue 9, pp 1931-1939
Date: 11 Apr 2012

Immobilization of Escherichia coli for detection of phage T4 using surface plasmon resonance

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Abstract

Phage contamination is a very serious and unavoidable problem in modern fermentation industry. It is necessary to develop sensitive and rapid phage detection methods for the early detection of phage contamination. In the present work, a real-time, rapid, specific and quantitative phage T4 detection method based on surface plasmon resonance (SPR) technique has been introduced. Escherichia coli was immobilized onto the preformed MPA self-assembled monolayer (SAM) through the widely used EDC/NHS cross-linking reaction as the recognition element. The bacteria immobilization was verified efficiently through the electrochemical measurements and fluorescence microscopy observations. The specific adsorption was much stronger than the non-specific adsorption of phage T4 binding to the biosensor surface modified by E. coli, and the latter could be neglected. The detection sensitivity reached 1×107 PFU/mL within 10 min. Within the experimental phage concentrations, the linear correlation between the SPR response and the phage concentration was good. The results suggest that the SPR technique is a potentially powerful tool for the phage or other virus detections, as a label-free, real-time, and rapid method.