Antibiotic Hydrolase Detection via MALDI-TOF Mass Spectrometry
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Solution Overview
Problem
Current methods for detecting antibiotic-resistant microorganisms, particularly those resistant to carbapenem, are slow, unreliable, and require complex processes, making early detection and treatment challenging due to limitations in sensitivity and accessibility of mass spectrometry techniques.
Innovation Solution
A method using MALDI-TOF mass spectrometry with a simple diagnostic kit for direct detection of antibiotic hydrolases like KPC, NDM, and OXA, involving sample pretreatment with non-ionic detergents and sonication to rapidly identify antibiotic-resistant strains without proteolysis, enabling quick confirmation of antibiotic resistance in under a dozen minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MALDI-TOF mass spectrometry is used for direct measurement of target protein, then measurement speed is improved, but sensitivity is insufficient due to low detection capability for limited amount of target substance
Solution Approach 1:
The patent introduces an antibody specific to the target protein as an intermediary substance. The antibody binds to the target protein to form an antibody-protein complex, which then binds to a detection reagent containing a marker. This intermediary approach amplifies the signal and enables detection of limited amounts of target substance with high sensitivity while maintaining rapid measurement capability.
Solution Approach 2:
The patent replaces direct physical measurement of the target protein with an immunological recognition system. Instead of directly detecting the target protein through mass spectrometry alone, the system uses antibody-antigen binding followed by marker detection, substituting the direct mechanical measurement approach with a biochemical recognition and signal amplification approach.
2Measurement precision
If LC/MS/MS method is used for protein analysis, then measurement accuracy is improved, but measurement time increases and automation becomes more complex
Solution Approach 1:
The patent extracts and detects only the specific target protein of interest using antibody-based recognition, rather than performing comprehensive protein analysis. This targeted approach removes unnecessary measurement steps and focuses resources on detecting only the relevant analyte, thereby maintaining high accuracy while reducing measurement time.
Solution Approach 2:
The patent changes the detection parameter from comprehensive mass spectral analysis of all proteins to specific immunological recognition followed by marker detection. This parameter change allows for rapid, accurate detection of the target protein without requiring the time-consuming comprehensive analysis performed by LC/MS/MS.
3Reliability
If conventional culture-antimicrobial sensitivity test is used, then reliability of resistance confirmation is improved, but detection time is excessively long requiring 1-5 days for culture and additional 1-2 days for sensitivity test
Solution Approach 1:
The patent performs preliminary detection of the target protein using antibody-based recognition and mass spectrometry before conducting full sensitivity testing. By detecting the presence of antibiotic-decomposing enzymes or specific resistance proteins early in the process, the system can rapidly identify resistant strains without waiting for the complete culture and sensitivity test timeline.
Solution Approach 2:
The patent substitutes the time-consuming culture and sensitivity test mechanical process with direct protein detection using antibody-mass spectrometry methodology. This replacement maintains reliability by directly detecting resistance mechanisms at the protein level while dramatically reducing the detection time from several days to a much shorter period.
4Loss of time
If nucleic acid amplification method is used for antibiotic hydrolase identification, then detection time is reduced, but reliability is compromised as it can only confirm presence of genes and detects inactivated enzyme fragments
Solution Approach 1:
The patent substitutes nucleic acid-based detection with protein-based detection using antibodies and mass spectrometry. This substitution allows for direct detection of functional proteins and enzymes responsible for antibiotic resistance, providing reliable confirmation of actual resistance expression rather than merely detecting genetic potential or fragmented DNA.
Solution Approach 2:
The patent extracts and detects only the functional protein products associated with antibiotic resistance, rather than analyzing entire genomes or DNA fragments. This targeted protein extraction and detection approach confirms actual resistance expression by detecting the active enzymes that confer resistance, maintaining rapid detection while improving reliability.
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
This approach allows for rapid and reliable detection of antibiotic resistance in specific strains, particularly beta-lactam antibiotic resistance, reducing the time and complexity of conventional methods, and providing a cost-effective, accessible diagnostic tool for widespread use.
Implementation Method 1
a mass-spectrometry method using MALDI-TOF (matrix-assisted laser desorption ionization time-of-flight)
Implementation Method 2
matrix-assisted laser desorption ionization time-of-flight
Implementation Method 3
involving sample pretreatment with non-ionic detergents and sonication
Data Source
AI summary
The present invention relates to a method of directly detecting, using a mass-spectrometry method, whether a microorganism contained in a sample is resistant to antibiotics, and a kit for detection used therewith. More particularly, the present invention relates to a method and kit for directly detecting an antibiotic hydrolase secreted by a microorganism resistant to antibiotics, thereby directly determining whether the microorganism is resistant to antibiotics. According to the present invention, it is possible to very simply and immediately confirm whether a specific strain is resistant to antibiotics in the field. In particular, a complicated pretreatment process such as proteolysis is not performed, and a complicated identification process of calibrating and then combining the obtained results is not performed. Accordingly, it is possible to realize a method of easily confirming whether antibiotic resistance occurs in just a dozen minutes, compared to a conventional technology in which it takes several days to confirm whether antibiotic resistance occurs, and a simple diagnostic kit used therewith.