Researchers at the Indian Institute of Technology Madras have developed a revolutionary chip-based biosensor named ε-µD that leverages impedance analysis on bacterial samples to determine antibiotic resistance in just three hours. This cutting-edge device represents a significant advancement over traditional antibiotic susceptibility tests, which typically require 48 to 72 hours due to the time-consuming process of culturing bacteria and observing their response to antibiotics.
The ε-µD biosensor comprises screen-printed carbon electrodes integrated into a microfluidic chip, functioning as sensors that detect changes in electrical properties when bacteria are exposed to antibiotics. By utilizing Electrochemical Impedance Spectroscopy (EIS), a technique commonly employed in electronics to analyze current-voltage behavior, this biosensor can effectively monitor bacterial growth and response to antibiotics in real time.
Conventional antimicrobial susceptibility testing methods rely on culturing bacteria, a procedure that can take several days, leading to unnecessary delays in prescribing appropriate antibiotics. This delay often results in the prescription of broad-spectrum antibiotics, contributing to the global issue of antimicrobial resistance (AMR) highlighted by the World Health Organization, which reported nearly five million deaths worldwide in 2019 associated with bacterial AMR.
The innovative design of the ε-µD biosensor includes a specialized nutrient solution that not only supports bacterial growth but also enhances the sensitivity of the electrical signals detected by the device. As bacteria multiply and interact with antibiotics, the impedance signal undergoes changes, which are accurately captured and analyzed by the biosensor, enabling the differentiation of resistant strains from non-resistant ones based on a signal-processing metric known as the Normalised Impedance Signal (NIS).
Prof. S. Pushpavanam from the Department of Chemical Engineering at IIT Madras emphasized the device’s capability to provide rapid susceptibility profiles for bacteria like E. coli and B. subtilis when exposed to antibiotics such as ampicillin and tetracycline. The biosensor’s effectiveness was further validated through trials using urine samples spiked with E. coli, showcasing its utility in analyzing clinically relevant specimens with high accuracy and speed.
Published in Nature Scientific Reports, this groundbreaking research is currently undergoing clinical validation at the IIT Madras Institute Hospital and is poised for commercialization through Kaappon Analytics India Pvt. Ltd., a startup incubated in the IITM Research Park, signaling a promising future for this innovative biosensor in revolutionizing antibiotic susceptibility testing.
Key Takeaways:
– The ε-µD biosensor developed by researchers at IIT Madras accelerates antibiotic susceptibility testing to just three hours, significantly faster than traditional methods.
– By utilizing Electrochemical Impedance Spectroscopy, the biosensor can monitor bacterial response to antibiotics in real time, aiding in the rapid identification of resistant strains.
– The biosensor’s design includes a unique nutrient solution that enhances the sensitivity of electrical signals, enabling accurate differentiation between resistant and non-resistant bacterial strains.
– Clinical validation and commercialization of the biosensor are underway, marking a significant step towards addressing the challenges posed by antimicrobial resistance through rapid and efficient antibiotic susceptibility testing.
Read more on electronicsforu.com