Impedance Biosensors
Impedance Biosensors - Related Videos
08:59
Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
09:38
Measuring Changes in Brain Endothelial Barrier Integrity with Two Impedance-based Biosensors in Response to Cancer Cells and Cytokines
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Cited by 1 •
2023
Here we demonstrate the technique of using impedance-based biosensors: ECIS and cellZscope, for measuring brain endothelial barrier strength. We detail the preparation and technique of adding various stimuli to an in vitro model of the brain endothelium. We measure, record, and give a representative analysis of the findings.
14:04
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
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Cited by 17 •
2013
Lytic phage biosensors and antibody beads are able to discriminate between methicillin resistant (MRSA) and sensitive staphylococcus bacteria. The phages were immobilized by a Langmuir-Blodgett method onto a surface of a quartz crystal microbalance sensor and worked as broad range staphylococcus probes. Antibody beads recognize MRSA.
13:21
In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila
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Cited by 5 •
2016
To detect healthy cells in whole animals that contain low levels of caspase activity, the highly sensitive biosensor designated CaspaseTracker was generated for Drosophila. Caspase-dependent biosensor activity is detected in long-lived healthy cells throughout the internal organs of adult animals reared under optimized conditions in the absence of death stimuli.
02:02
Detection of a Target Analyte Using a Bacterial Biosensor
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2025
Source: Barber, A. E., et al. Preparation and Application of a New Bacterial Biosensor for the Presumptive Detection of Gunshot Residue. J. Vis. Exp. (2019).This video demonstrates the detection of specific analytes using a bacterial biosensor. A bacterial culture carrying a plasmid with a red fluorescent protein (RFP) gene under an analyte-sensitive promoter is taken. After thoroughly wiping the test surface, a small section of the wipe is immersed in the culture and incubated. The analyte...
FAQs
The signal can arise from changes in charge transfer, interfacial capacitance, or ionic resistance near the electrode. These electrical properties shift when material accumulates at or interacts with the sensor surface. Measuring the resulting impedance change converts a molecular or cellular event into an analytical readout, allowing researchers to monitor recognition processes without attaching a separate detection label.
Specificity comes from the recognition element bound to the electrode, such as an antigen or antibody. When its complementary target interacts with the surface, the local electrical environment changes and produces a measurable response. This arrangement links target binding to impedance variation, supporting analysis of antibody-antigen interactions, pathogens, or immune-related biomarkers in complex biological investigations.
Label-free analysis avoids extensive sample labeling and processing, which can simplify measurements of biological interactions. Real-time monitoring also allows electrical changes to be followed as events occur at the sensor surface rather than only after a final endpoint. Together, these characteristics are useful for tracking pathogen recognition, immune biomarker detection, and dynamic host-pathogen interactions.
A typical workflow begins by attaching a suitable recognition element to an electrode surface. The prepared sensor is then exposed to a sample containing a possible antigen, antibody, pathogen, or cell, followed by measurement of the electrical response near the electrode. Researchers interpret changes in impedance as evidence of altered surface interactions, using the selected recognition system to support target-specific analysis.
They are useful when researchers need rapid, label-free detection of infectious agents, immune biomarkers, or antibody-antigen interactions. Their compatibility with real-time measurements supports applications in diagnostics and pathogen surveillance, while surface-based recognition can help examine biological binding events. The same platform can also contribute to studies of how host and pathogen components interact at an analytical interface.
The measured impedance response indicates that interactions near the electrode have changed the local electrical environment. Depending on the recognition element and target, this can support detection of a pathogen, immune biomarker, antigen, antibody, or cell. In research settings, the signal provides an electrical readout for examining recognition events and following changes relevant to infection or immune analysis.