Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Escherichia coli genosensor based on polyaniline.

Kavita Arora1, Nirmal Prabhakar, Subhash Chand

  • 1Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi-110012, India.

Analytical Chemistry
|July 17, 2007
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Editorial: Host-pathogen interactions: cellular damage, death, and adaptation in microbial infections.

Frontiers in cellular and infection microbiology·2026
Same author

Cu-porphyrin PCN-222 MOF hybridized with Au nanoclusters to accelerate electron transfer for ultrasensitive detection of 25-hydroxyvitamin D<sub>3</sub>.

Bioelectrochemistry (Amsterdam, Netherlands)·2026
Same author

Current Landscape of Anti-HER2 Targeted Therapy in Breast Cancer: Challenges and Future Perspectives.

Cancer investigation·2026
Same author

State-Level Abortion Bans and the OBGYN Workforce: A Review of Current Evidence.

JAMA health forum·2026
Same author

Electrochemical detection of miRNA-128 in Alzheimer's disease using (3-aminopropyl) triethoxysilane and citrate-capped green-synthesized silver nanoparticles.

Mikrochimica acta·2026
Same author

MOF-metal nanohybrid-assisted charge transfer amplification for electrochemical biosensing of the MUC1 cancer biomarker.

The Analyst·2026
Same journal

Structural Hairpin Anchoring-Mediated TtAgo Activity Regulation for Programmable Biosensing.

Analytical chemistry·2026
Same journal

Digital Revitalization of a Legacy Linear Ion Trap System.

Analytical chemistry·2026
Same journal

An Interface-Regulated Electrochemical Biosensing Platform Based on the Cascade Amplification of Primer Exchange Reaction and CRISPR/Cas12a for Noninvasive Bladder Cancer Diagnosis.

Analytical chemistry·2026
Same journal

Spatially Resolved Diffusion NMR for Structurally Heterogeneous Materials.

Analytical chemistry·2026
Same journal

Direct Whole-Blood Multiplexing of Small Molecules via a Micelle-Enhanced Chemiluminescent Paper Sensor with Mesoporous Silica Membrane.

Analytical chemistry·2026
Same journal

Modeling the Effects of Short-Range Randomness in Packed Sphere Beds.

Analytical chemistry·2026
See all related articles

This study presents a novel bioelectrode for detecting Escherichia coli (E. coli) without PCR. The avidin-modified polyaniline (PANI) electrode offers rapid and sensitive electrochemical detection of E. coli cells and DNA.

Area of Science:

  • Electrochemistry
  • Biosensors
  • Molecular Diagnostics

Background:

  • Traditional methods for detecting Escherichia coli (E. coli) often require Polymerase Chain Reaction (PCR), which is time-consuming and resource-intensive.
  • Development of rapid, sensitive, and direct detection methods for bacterial pathogens is crucial for public health and food safety.
  • Electrochemical biosensors offer a promising platform for sensitive and label-free or low-label detection of biological targets.

Purpose of the Study:

  • To develop and characterize an avidin-modified polyaniline (PANI) bioelectrode for the direct electrochemical detection of Escherichia coli (E. coli).
  • To evaluate the performance of the bioelectrode in detecting E. coli DNA and whole cells using a differential pulse voltammetric technique.
  • To assess the potential of the developed bioelectrode for rapid, PCR-free detection of E. coli.

Related Experiment Videos

Main Methods:

  • Electrochemical deposition of avidin-modified polyaniline (PANI) onto a platinum disk electrode.
  • Immobilization of a 5'-biotin-labeled E. coli probe (BdE) onto the avidin-PANI bioelectrode.
  • Differential pulse voltammetry (DPV) in the presence of methylene blue as a DNA hybridization indicator for detecting complementary DNA and E. coli cells.

Main Results:

  • The BdE-avidin-PANI bioelectrode successfully detected complementary target probes, E. coli genomic DNA, and E. coli cells electrochemically.
  • Detection limits achieved were as low as 0.009 ng/µL for target probe, 0.01 ng/µL for E. coli genomic DNA, and 11 E. coli cells/mL.
  • Hybridization and detection times ranged from 60 seconds to 14 minutes, demonstrating rapid detection capabilities without PCR.
  • The bioelectrode showed reusability for 5-7 cycles and stability at temperatures between 30-45°C.

Conclusions:

  • Avidin-modified PANI bioelectrodes provide a sensitive and rapid platform for the direct electrochemical detection of E. coli.
  • This PCR-free approach offers a significant advancement for quick identification of E. coli in various samples.
  • The developed bioelectrode holds potential for practical applications in diagnostics, food safety, and environmental monitoring.