Single-Particle Aerosol Detection Without MALDI Matrix Pretreatment
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Solution Overview
Problem
Current methods for detecting aerosolized biological and chemical threat agents are unable to provide real-time identification, requiring extensive processing and resulting in delays, which is unacceptable for biodefense and point-of-care applications, and they often fail to simultaneously identify bacteria, viruses, and large bioorganic molecules without pretreating particles with complex organic MALDI matrices.
Innovation Solution
The use of time-of-flight mass spectrometry (TOF-MS), optical single particle sensors, and a data analysis system capable of data fusion, combined with machine learning methods, to identify aerosol analyte particles in real-time without complex organic MALDI matrices, by generating an aerosol particle beam, indexing particles, triggering ionization pulses, and analyzing ionized fragments and photons to determine particle composition using compiled spectral data and a training data set knowledge base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex organic MALDI matrices are used for particle analysis, then identification accuracy is improved, but device complexity and sample processing complexity increase
Solution Approach 1:
The patent extracts and eliminates the complex organic MALDI matrix component from the analysis system. By using direct laser desorption/ionization without matrices, the invention removes the need for matrix preparation, application, and removal steps, thereby reducing device complexity while maintaining identification accuracy through direct analysis of aerosol particles
Solution Approach 2:
The patent introduces an intermediary aerosolization step that transforms liquid or solid samples into aerosol particles. This intermediary form enables direct introduction into the mass spectrometer without requiring MALDI matrices, simplifying the overall system while maintaining the ability to identify biological particles through their mass spectral fingerprints
2Measurement precision
If extensive sample processing is performed, then identification accuracy is improved, but analysis time increases
Solution Approach 1:
The patent performs preliminary aerosolization of the sample before analysis. By converting the sample to aerosol form in advance, the system enables direct injection into the mass spectrometer without requiring time-consuming steps such as matrix application, drying, or complex sample preparation, thus reducing analysis time while maintaining identification accuracy
Solution Approach 2:
The patent implements continuous aerosol flow directly into the mass spectrometer, eliminating interruptions for sample processing steps. The continuous introduction of aerosol particles allows for real-time analysis without the stop-start nature of traditional MALDI workflows, thereby reducing total analysis time while maintaining high identification accuracy through continuous data acquisition
3Adaptability or versatility
If multiple particle types are analyzed simultaneously, then versatility is improved, but measurement precision decreases
Solution Approach 1:
The patent segments the analysis by examining individual aerosol particles one at a time through single particle analysis. Each particle is introduced, analyzed, and detected separately, allowing the system to maintain high measurement precision for each individual particle while simultaneously being able to analyze multiple different particle types (bacteria, viruses, spores) in the same sample, thus achieving both versatility and precision
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 high-accuracy, real-time identification of aerosol analyte particles, including bacteria, fungi, viruses, and toxins, reducing analysis time and eliminating the need for complex sample processing, thereby improving response times and treatment effectiveness in biodefense and healthcare applications.
Implementation Method 1
time-of-flight mass spectrometry (TOF-MS)
Implementation Method 2
triggering an ionization pulse laser to simultaneously generate an IR laser pulse and an UV laser pulse when each indexed particle reaches the ionization region
Implementation Method 3
detecting photons associated with each indexed particle
Implementation Method 4
triggering an ionization pulse laser to simultaneously generate an IR laser pulse and an UV laser pulse
Implementation Method 5
generating ionized fragments of each indexed particle
Data Source
AI summary
Disclosed are systems are methods for identifying the composition of single aerosol particles, particularly that of bioaerosol particles, without pre-treatment using complex organic MALDI matrices. A continuous timing laser may be used to index aerosol particles, measure particle properties, and trigger a pulse ionization laser. Ionized fragments and optionally photons associated with each particle producing by the ionization laser may be analyzed using one or more detectors including a TOF-MS detector and an optical detector. The laser pulse may comprise a simultaneous IR and UV laser pulse when fragments comprise predominantly of UV chromophores. Unique spectral data associated with each indexed particle from each detector may be compiled using data fusion to generate compiled spectral data. Machine learning methods may be used to improve the prediction of composition over time.