A bioresorbable wireless biosensor platform for real-time, label-free detection of biological targets

Background

The field of rapid and sensitive biological detection, particularly for pathogens such as bacteria and viruses, is of critical importance in medical diagnostics, environmental monitoring, and food safety. Traditional laboratory-based techniques, such as culture methods and polymerase chain reaction (PCR), while highly sensitive and specific, are often time-consuming, require specialized equipment, and are not easily adaptable to point-of-care or field settings. The growing threat of infectious diseases, antibiotic-resistant bacteria, and the need for real-time monitoring in both clinical and non-clinical environments have driven demand for portable, easy-to-use biosensors that can provide immediate and accurate results. Furthermore, the integration of such sensors onto biological surfaces or within living systems opens new possibilities for continuous health monitoring and early detection of disease outbreaks.

Current approaches to biosensing, however, face significant limitations. Many existing sensors rely on antibodies or nucleic acid probes as recognition elements, which can suffer from limited stability, high production costs, and susceptibility to denaturation under harsh conditions. These methods often require complex sample preparation, labeling steps, or amplification processes, which increase the time and expertise needed for operation. Additionally, conventional biosensors are typically fabricated on rigid substrates, making conformal integration with soft or irregular biological tissues challenging. Wireless and battery-free operation remains a major hurdle, restricting the deployment of sensors in remote or in vivo applications. As a result, there is a pressing need for biosensor platforms that combine high sensitivity and selectivity with robustness, scalability, and the ability to operate seamlessly in diverse environments and on complex biological surfaces.

Technology

This technology is a highly sensitive, portable biosensor platform designed for real-time, label-free detection of a wide range of biological targets, particularly pathogenic bacteria. It utilizes antimicrobial peptides (AMPs) or other specific binding molecules immobilized onto advanced microelectronic transducers such as microelectrode arrays, nanowires, or graphene films. When a target analyte, like a bacterium, binds to the sensor surface, it induces a measurable change in the electrical properties—such as impedance, resistance, or conductivity—which is detected via impedance spectroscopy. The sensor can be fabricated on dissolvable, bioresorbable substrates (e.g., silk fibroin), enabling conformal integration onto complex biological surfaces. Additionally, the platform supports wireless, battery-free operation through passive telemetry circuits, allowing remote monitoring without the need for onboard power sources.

What differentiates this technology is its combination of high sensitivity, broad applicability, and robust integration into diverse environments. The use of AMPs as biorecognition elements offers superior stability and selectivity compared to traditional antibodies, enabling detection limits as low as single bacterial cells and resilience under harsh conditions. The sensor’s modular design allows for customization to detect various analytes, including bacteria, viruses, cancer cells, and small molecules, simply by selecting appropriate binding motifs. Its fabrication on bioresorbable substrates ensures seamless, minimally invasive application to biological tissues, while the integration of wireless, battery-free telemetry facilitates long-term, maintenance-free deployment in both medical and environmental contexts. This convergence of advanced materials, sensitive detection, and practical deployment makes the technology uniquely suited for applications ranging from medical diagnostics and continuous health monitoring to environmental and food safety surveillance.

Benefits

• Highly sensitive and selective detection of pathogens and biological targets down to single-cell levels without the need for labels or complex sample preparation.
• Real-time, label-free monitoring enabled by impedance spectroscopy on advanced microelectronic transducers such as microelectrode arrays, nanowires, and graphene films.
• Use of stable antimicrobial peptides (AMPs) as biorecognition elements, offering robustness and broad-spectrum binding capabilities compared to antibodies.
• Fabrication on dissolvable, bioresorbable substrates allows conformal integration with complex biological surfaces and temporary support during application.
• Wireless, battery-free operation through inductive coupling enables remote, maintenance-free sensing in diverse environments including in vivo applications.
• Scalable and portable platform adaptable for various sizes and settings, from nanoscale implants to handheld field devices.
• Versatile applicability across medical diagnostics, environmental monitoring, hospital sanitation, and multiplexed sensing of multiple analytes simultaneously.

Applications

• Point-of-care infectious disease diagnostics
• Continuous in vivo health monitoring
• Food and water contamination detection
• Hospital surface pathogen surveillance
• Wireless implantable biosensor devices

Additional info

This biosensor platform utilizes antimicrobial peptides on microelectronic transducers like microelectrode arrays or graphene films. It detects target analytes (e.g., bacteria) by monitoring changes in electrical properties via impedance spectroscopy. Key features include label-free, real-time readout, bioresorbable substrates for conformal integration, and wireless, battery-free operation for sensitive biological monitoring.