Paper-Based Colorimetric C. difficile Detection via Glutamate Dehydrogenase
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Solution Overview
Problem
Current diagnostic methods for C. difficile infection are time-consuming, require complex laboratory equipment, and are not suitable for point-of-care testing, limiting their accessibility and efficiency in clinical settings.
Innovation Solution
A rapid, point-of-care diagnostic device using a paper medium loaded with glutamate and an oxidizing agent, combined with an electron transfer agent and tetrazolium dye precursor, which changes color in the presence of glutamate dehydrogenase-producing bacteria, allowing for quick detection of C. difficile without the need for laboratory equipment or multiple reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional diagnostic methods (PCR, ELISA, bacterial culture) are used, then detection accuracy is maintained, but testing time increases and device complexity increases
Solution Approach 1:
The patent extracts the essential detection function from complex laboratory equipment by using a paper-based device that performs GDH detection through simple color change observation, eliminating the need for PCR machines, ELISA readers, or culture incubators while maintaining detection accuracy
Solution Approach 2:
The patent employs disposable paper-based test devices that are inexpensive, single-use, and do not require expensive laboratory equipment, enabling rapid testing without the time-consuming setup and operation of traditional diagnostic systems
2Measurement precision
If traditional diagnostic methods (PCR, ELISA) are used, then detection accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical and electronic laboratory equipment with a simple paper-based chemical reaction system where glutamate dehydrogenase catalyzes a colorimetric reaction that can be observed visually, eliminating the need for sophisticated instrumentation
Solution Approach 2:
The patent creates a simplified copy of the diagnostic function using paper-based chemistry that mimics the detection capability of complex laboratory methods but operates through simple color changes rather than requiring expensive equipment
3Reliability
If traditional diagnostic methods are used, then reliable detection is achieved, but ease of operation decreases
Solution Approach 1:
The patent enables the test device to perform the detection function autonomously through the inherent catalytic activity of glutamate dehydrogenase that produces a visible color change, requiring no technical expertise, reagent additions, or complex operational steps from the user
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
Enables rapid detection of C. difficile in under 30 minutes, improving hospital throughput and patient care by allowing for immediate identification and treatment, reducing resource requirements and costs, and enhancing diagnostic efficiency.
Implementation Method 1
GDH is an enzyme that catalyzes the conversion of glutamate in a reduction-oxidation reaction
Implementation Method 2
The reaction utilized in the presented device for the reduction of glutamate
Implementation Method 3
rapid colorimetric diagnostic test for C. difficile
Data Source
AI summary
In certain aspects, provided herein are methods and kits for detecting the presence of C. difficile in a biological sample. Also provided herein are methods of selecting of identifying a subject that would benefit from C. difficile treatment.