Differential Mobility Spectrometry for Rapid Analyte Quantification
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Solution Overview
Problem
Mass spectrometric detection and quantification of analytes in complex biological samples require high-resolution separation techniques, which are time-consuming and costly, reducing throughput.
Innovation Solution
The use of laser desorption thermal ionization combined with differential mobility spectrometry, eliminating the need for liquid chromatographic separation techniques, allowing for rapid quantification of analytes like testosterone and Vitamin D in serum samples using a tandem mass spectrometer and differential mobility spectrometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid chromatographic separation techniques are used to improve selectivity and accuracy of analyte detection, then measurement precision is improved, but productivity decreases due to time-consuming sample preparation and separation
Solution Approach 1:
The invention extracts and removes the liquid chromatographic separation step from the traditional analytical workflow. By using direct mass spectrometric detection with advanced ion mobility separation, the method eliminates the time-consuming liquid chromatography component while maintaining analyte selectivity through alternative separation mechanisms in the gas phase.
Solution Approach 2:
The invention replaces the mechanical liquid chromatographic separation system with a gas-phase ion mobility separation system coupled directly to mass spectrometry. This substitution eliminates the need for liquid phase separation equipment and procedures, dramatically reducing analysis time while maintaining or improving selectivity through orthogonal separation mechanisms.
2Measurement precision
If liquid chromatographic separation techniques are used to reduce interfering species, then measurement precision is improved, but loss of time increases due to extended sample preparation and separation duration
Solution Approach 1:
The invention extracts the separation function from the liquid chromatography module and relocates it to the gas phase within the ion mobility cell. This allows selective separation of analytes from interfering species to occur after ionization, eliminating the need for prolonged liquid phase separation and sample preparation.
Solution Approach 2:
The invention performs ionization and initial separation of analytes from the matrix before the actual detection step. By using ion mobility separation in the gas phase prior to mass spectrometric detection, the method pre-separates analytes from interfering species, reducing the need for extended liquid chromatographic separation and sample preparation.
3Measurement precision
If liquid chromatographic separation techniques are used to improve analyte selectivity, then measurement precision is improved, but device complexity increases due to additional separation equipment and methodology
Solution Approach 1:
The invention merges the separation and detection functions into a more integrated workflow. By coupling ion mobility separation directly with mass spectrometry in a unified gas-phase analytical platform, the method eliminates the need for separate liquid chromatography equipment and methodology, reducing overall device complexity while maintaining selectivity.
Solution Approach 2:
The invention replaces the complex liquid chromatographic separation system with a simpler gas-phase ion mobility separation system. This substitution eliminates the need for pumps, columns, and solvent delivery systems associated with liquid chromatography, thereby reducing device complexity while achieving comparable or superior selectivity through alternative physical principles.
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 method enables rapid and selective detection and quantification of analytes with improved throughput, achieving a lower limit of quantitation of 0.1 ng/mL and reducing interference, thereby enhancing analytical efficiency and reducing sample preparation time.
Implementation Method 1
The ionization source can include a diode laser to impart heat energy to a prepared biological sample to desorb at least a portion of the biological sample
Implementation Method 2
a diode laser to impart heat energy to a prepared biological sample to desorb at least a portion of the biological sample
Implementation Method 3
laser desorption thermal ionization in combination with differential mobility spectrometry
Implementation Method 4
The ionized analyte flow is introduced into a differential mobility spectrometer set at a compensation voltage selected to extract ionized analyte molecules from the ionized analyte flow
Data Source
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AI summary
Methods and systems for quantifying analytes in a biological sample are provided comprising preparing a biological sample for mass spectrometric analysis, utilizing an ionization source to ionize at least a portion of the prepared biological sample to generate an ionized analyte flow, introducing the ionized analyte flow into a differential mobility spectrometer set at a compensation voltage selected to extract ionized analyte molecules from the ionized analyte flow, introducing an output analyte flow of the differential mobility spectrometer into a mass spectrometer to detect and quantify analyte ions in the output analyte flow.