Detecting and characterising bacteria as well as monitoring their viability are routine tasks in microbiology. Conventional methods of cell detection and viability monitoring are often time-consuming and/or expensive. We have developed a near-real time, cost-effective and portable fluorometer, the optrode, for quantifying fluorescence signals. We are currently developing protocols to use the optrode to detect, identify and quantify bacteria as well as to monitor their viability using nucleic acid stains such as SYTO 9 and propidium iodide that are routinely used as live/dead stains. Our results are promising but indicate that better dyes are needed to fully characterise bacteria.
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