Development of bio-nanowire networks using phage-enabled assembly for biological sensor application

Area of Science:

• Nanotechnology
• Electrochemistry
• Biosensor Development

Background:

• Biosensor sensitivity is critically dependent on the nanomaterials used in the working electrode.
• Filamentous phages offer a unique platform for creating bio-nanowires due to their genetic modifiability and structural properties.

Purpose of the Study:

• To develop a novel electrochemical biosensor utilizing bio-nanowires composed of genetically modified filamentous phages and nanoparticles.
• To evaluate the sensor's performance for sensitive and rapid detection of specific molecules, exemplified by electrochemical glucose detection.

Main Methods:

• Immobilization of fd-tet p8MMM filamentous phages, displaying the MMM peptide, onto an electrochemical sensor's active area via chemical binding.
• Construction of bio-nanowires using p8MMM phages and silver nanoparticles to enhance detection capabilities.
• Electrochemical measurements, including cyclic voltammetry, to assess sensor response to varying glucose concentrations.

Main Results:

• The bio-nanowire sensor demonstrated sensitive and rapid detection of molecules, with significant current responses observed across a range of glucose concentrations (10(-7) to 10(-4)M).
• Achieved a cyclic voltammetry peak current (Ip) of 689µA/cm² and a peak potential (Ep) of 280mV for glucose detection.
• The filamentous nanophage-based electrode exhibited high sensitivity and good stability across various pH and temperature conditions during enzyme determination.

Conclusions:

• The developed bio-nanowire sensor shows significant potential for sensitive, rapid, and label-free molecular detection.
• This platform may find wide applications in analytical systems and advanced biological sensor technologies.
• The use of genetically modified filamentous phages presents a promising strategy for next-generation biosensor design.