Microbe Detection via MALDI-TOF Mass Spectrometry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microbiological detection methods for pathogenic microbes, such as Salmonella, are time-consuming and labor-intensive, requiring multiple cultivation steps and often result in lengthy analysis times, while molecular biology methods like PCR are costly and prone to interference.
Innovation Solution
Combining reduced cultivation steps with mass spectrometric detection using MALDI time-of-flight mass spectrometers to identify target microbes in complex mixtures by analyzing protein profiles, which allows for rapid and specific identification even when microbes constitute a small proportion of the sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microbiological detection methods with multiple cultivation steps are used, then detection reliability is improved, but analysis time increases significantly
Solution Approach 1:
The patent applies preliminary action by performing selective cultivation steps before mass spectrometric analysis to enrich target microbes and reduce sample complexity. This preliminary enrichment ensures that when mass spectrometry is performed, the target microbes are sufficiently concentrated for reliable detection, thus maintaining detection reliability while reducing the need for multiple subsequent cultivation and identification steps
Solution Approach 2:
The patent replaces the mechanical/biological system of multiple sequential cultivation steps with a physics-based mass spectrometric analysis system. By substituting traditional biochemical identification methods (which require days of cultivation) with mass spectrometry (which can analyze samples rapidly), the patent dramatically reduces analysis time while maintaining or improving detection reliability through direct molecular characterization of microbes
2Loss of time
If molecular biology methods like PCR are used, then analysis time is reduced, but cost and susceptibility to interference increase
Solution Approach 1:
The patent substitutes PCR-based molecular biology methods with mass spectrometric analysis. This replacement eliminates the interference susceptibility inherent in PCR (such as false positives from contamination or false negatives from inhibitors) by using a physics-based detection method that directly measures microbial proteins and metabolites without amplification steps that are vulnerable to interference
Solution Approach 2:
The patent changes the detection parameter from nucleic acid amplification (PCR) to protein/metabolite mass spectrometry. This parameter change shifts the detection basis from genetic material to cellular components, thereby reducing susceptibility to PCR-specific interferences while maintaining rapid analysis capabilities
3Measurement precision
If multiple cultivation steps are performed for reliable microbe detection, then detection accuracy is improved, but productivity decreases
Solution Approach 1:
The patent replaces sequential cultivation steps with parallel mass spectrometric analysis capabilities. By using mass spectrometry, multiple samples can be analyzed simultaneously or in rapid succession without the sequential bottlenecks of traditional cultivation methods, thereby increasing throughput while maintaining detection accuracy through direct molecular identification
Solution Approach 2:
The patent performs preliminary selective cultivation to concentrate target microbes and reduce sample complexity before mass spectrometric analysis. This preliminary step ensures high detection accuracy by enriching targets while the subsequent rapid mass spectrometric analysis enables high throughput processing of multiple samples
4Reliability
If conventional detection methods are used, then comprehensive identification is achieved, but device complexity and operational complexity increase
Solution Approach 1:
The patent replaces complex sequential biochemical identification methods (multiple cultivation steps, various biochemical tests, serological methods) with a single mass spectrometric analysis system. This substitution reduces method complexity by consolidating multiple identification steps into one unified physics-based measurement process while maintaining or improving identification accuracy through direct molecular fingerprinting
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 enables rapid, cost-effective, and specific detection of target microbes in complex mixtures, reducing analysis time from days to hours and improving sensitivity and specificity compared to conventional methods.
Implementation Method 1
mass spectrometric detection using MALDI time-of-flight mass spectrometers
Implementation Method 2
MALDI time-of-flight mass spectrometers
Implementation Method 3
mass spectrometric detection using MALDI time-of-flight mass spectrometers
Implementation Method 4
MALDI time-of-flight mass spectrometers
Data Source
AI summary
A method of detecting specified target microbes in different types of sample uses only one to two cultivation steps for the enrichment of the target microbes from the sample, preferably in selective culture media, combined with a mass spectrometric detection method that identifies the target microbes in mixtures with other microbes even if the target microbes account for only a small proportion of the mixture. The sample may be a food sample, a sample from bodies of water used for bathing, a soil sample, a swabbed sample, a stool sample, an impactor sample with collected aerosol particles, amongst many others. The detection method is several days faster than standard methods and less expensive.