Microbial Biosensors

Microbial biosensors use microbes to detect specific substances.

These devices integrate two main components: biosensing organisms and a transducer that converts the biological response into a measurable signal.

For example, many designs use genetically engineered biosensing organisms, such as Escherichia coli, housed in multiwell plates connected to transducers for rapid, real-time detection of target analytes.

Interaction between an analyte, like sucrose, and the microbes elicits a biochemical response that generates a measurable signal.

This signal may arise from altered metabolism, luminescence production, or electrochemical outputs.

Detection systems capture these signals using optical methods or electrochemical readouts based on voltage or current changes.

Advances in micro- and nanotechnologies enable miniaturized systems, such as microfluidic chips, to simultaneously test multiple analytes, including metabolites or pollutants, using very small sample volumes.