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Related Concept Videos

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Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...

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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor
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Published on: February 16, 2018

Aptamer-based viability impedimetric sensor for bacteria.

Mahmoud Labib, Anna S Zamay, Olga S Kolovskaya

    Analytical Chemistry
    |October 19, 2012
    PubMed
    Summary
    This summary is machine-generated.

    A novel aptamer-based impedimetric sensor (AptaVISens-B) detects live Salmonella typhimurium with high specificity. This electrochemical platform offers rapid, label-free detection of bacteria, including viable but nonculturable strains.

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    Area of Science:

    • Biosensors and diagnostics
    • Molecular biology and aptamer selection
    • Electrochemical sensing platforms

    Background:

    • Accurate detection of viable bacteria is crucial for public health and food safety.
    • Existing methods for bacterial detection can be time-consuming or lack specificity for live organisms.
    • Development of rapid, sensitive, and specific biosensors is needed.

    Discussion:

    • The selected DNA aptamers were immobilized on a gold nanoparticle-modified screen-printed carbon electrode (GNP-SPCE) to create an impedimetric sensor.
    • The aptasensor demonstrated high selectivity, detecting Salmonella typhimurium down to 600 CFU mL(-1).
    • The sensor successfully differentiated S. typhimurium from other Salmonella species, including S. enteritidis and S. choleraesuis.

    Key Insights:

    • Development of a highly specific aptamer-based viability impedimetric sensor (AptaVISens-B) for bacteria.
    • Demonstrated detection of live Salmonella typhimurium with high sensitivity and species specificity.
    • Successful integration of aptamers onto a GNP-SPCE for label-free electrochemical detection.

    Outlook:

    • This work paves the way for aptamer-based viability sensing of various microorganisms.
    • Potential application in detecting viable but nonculturable (VBNC) bacteria.
    • Future development of rapid, economic, and label-free electrochemical platforms for microbial diagnostics.