Core-Shell Nanofiber Biosensor for Rapid Wound Infection Detection
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Solution Overview
Problem
Current wound infection detection techniques are time-consuming, costly, and require specialized training, limiting their application for real-time monitoring and assessment, and existing biosensors lack sensitivity and reliability due to environmental interference and reliance on unreliable indicators like pH changes.
Innovation Solution
A polymeric, core-shell nanofiber biosensor incorporating a hemicyanine dye and surfactant, such as Tween 80, is developed to change color in response to bacterial lipase, enhancing sensitivity and providing a vivid visual indication of infection through controlled fiber alignment and chemical composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional wound infection detection methods (swabbing/plating, PCR) are used, then detection accuracy is improved, but time consumption and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical and laboratory-based detection systems (swabbing, plating, PCR equipment) with a simple optical detection system based on colorimetric nanofibers. The nanofibers contain pH-sensitive dyes that change color in response to bacterial metabolic activity, allowing visual detection without sophisticated instrumentation. This substitution maintains sufficient detection accuracy while dramatically reducing time and cost requirements.
Solution Approach 2:
The patent introduces pH-sensitive nanofibers as an intermediary between the bacterial infection and the detection process. These nanofibers act as mediators that translate bacterial metabolic activity (acid production) into visible color changes. This intermediary system enables rapid detection by converting biological processes into optical signals that can be observed immediately, bypassing the need for time-consuming culture methods.
2Reliability
If conventional detection methods are used, then reliable infection diagnosis is achieved, but antibiotic overuse increases leading to bacterial resistance
Solution Approach 1:
The patent enables preliminary detection of bacterial presence and infection status before antibiotic treatment is initiated. By providing rapid, reliable infection diagnosis at the point of care, the system allows clinicians to make informed decisions about whether antibiotics are actually needed. This preliminary assessment prevents unnecessary antibiotic prescriptions, thereby reducing selective pressure that drives bacterial resistance development.
Solution Approach 2:
The patent establishes a feedback mechanism where real-time colorimetric signals provide continuous information about infection status. This feedback loop enables monitoring of wound healing progress and bacterial clearance, allowing dynamic adjustment of treatment strategies. When the color indicator shows no bacterial presence, antibiotic treatment can be discontinued, preventing overuse and resistance development while maintaining reliable infection control.
3Loss of time
If pH-based colorimetric biosensors are used for infection detection, then early detection capability is improved, but reliability decreases due to environmental pH variations
Solution Approach 1:
The patent applies local quality by creating microenvironments within the nanofiber structure that are isolated from external pH variations. The nanofibers are designed with hydrophobic domains that concentrate bacterial metabolic products (protons) in localized regions, creating microenvironments where pH changes are amplified and isolated from bulk solution pH. This allows the sensor to respond specifically to bacterial acid production while being insensitive to environmental pH fluctuations from cleaning agents or topical antimicrobials.
Solution Approach 2:
The patent exploits parameter changes at the nanoscale level, where confinement effects and surface-to-volume ratios create unique local conditions. The nanofiber structure transforms bulk pH measurements into localized proton concentration measurements, where even small amounts of bacterial acid production create detectable signal changes. This parameter transformation enables reliable detection based on bacterial metabolism rather than bulk pH, overcoming the reliability issues of traditional pH-based sensors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The biosensor achieves rapid, cost-effective, and reliable in situ detection of pathogens at low concentrations, reducing the risk of infection progression and antibiotic misuse by providing real-time visual feedback without the need for advanced instrumentation.
Implementation Method 1
Bacteria secrete different virulence factors, such as proteins and enzymes. And among these secretions, lipase is one of the common factors responsible for diseases and infections.
Implementation Method 2
The in situ colorimetric-based biosensors' advantages are low-cost, easy handling, easy to store, and easy readout, which can be observed with the naked and untrained eyes in real-time
Implementation Method 3
Incorporating a surfactant, such as Tween 80, into the shell structure of the nanofibers can increase the sensitivity of the nanofibers to bacterial lipase.
Implementation Method 4
Incorporating a surfactant, such as Tween 80, into the shell structure of the nanofibers can increase the sensitivity of the nanofibers to bacterial lipase by increasing the lipase activity
Data Source
AI summary
A biosensor for real-time monitoring of a wound can provide valuable data regarding the presence of bacteria. A nanofibrous biosensor is provided for monitoring wound status at the point of care. The colorimetric biosensor changes color in response to low levels of bacteria and fungi, making it visible to unaided and untrained eyes. A colorimetric probe is a hemicyanine dye that changes color from yellow to green in the presence of lipase. Dye is incorporated into a shell composition of core-shell nanofibers made of polyurethane and polyvinylpyrrolidone. As a means of increasing the biosensor's sensitivity, the alignment of nanofibers is controlled and a surfactant added to the shell (e.g., Tween 80). Alignment of nanofiber enables better localization, and Tween 80 increases lipase activity, which facilitates near immediate color changes above critical levels of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans, and Candida aureus. All ESKAPEE bacteria are detected within 2 hours.