Supported Liquid Extraction for High-Throughput Testosterone LC-MS/MS
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Solution Overview
Problem
Existing clinical diagnostic methods for endogenous biomarkers like testosterone suffer from low throughput, antibody cross-reactivity, and require multiple tests for accurate analysis, especially in small sample volumes, making them inefficient for screening multiple analytes.
Innovation Solution
A method combining supported liquid extraction (SLE), liquid chromatography (LC), and tandem mass spectrometry (MS/MS) is used to purify and analyze testosterone, allowing for high-throughput and sensitive detection without derivatization, using systems like MDS-Sciex API5000 triple quadrupole mass spectrometers and LC-MS/MS systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radioimmunoassay or enzyme-linked immunoassay methods are used for testosterone analysis, then the assay can detect testosterone in samples, but the throughput is low and multiple serial dilutions are required
Solution Approach 1:
The patent replaces the mechanical/chemical immunoassay system with a mass spectrometry-based detection system. LC-MS/MS uses mass-to-charge ratio measurement instead of antibody-antigen binding, eliminating the need for serial dilutions and enabling higher throughput while maintaining or improving measurement precision for testosterone and multiple other analytes simultaneously
Solution Approach 2:
The LC-MS/MS system provides multi-functionality by enabling simultaneous detection of multiple analytes (testosterone, cortisol, DHEA-S, and other steroid hormones) in a single assay run, whereas immunoassays typically require separate tests for each marker, thus dramatically improving productivity without sacrificing measurement precision
2Measurement precision
If immunoassay methods are used for multiple biomarker analysis, then each marker can be detected individually, but multiple separate tests are required increasing complexity
Solution Approach 1:
The patent merges the detection of multiple individual biomarkers into a single integrated LC-MS/MS assay. The liquid chromatography separates multiple analytes in one run, and the mass spectrometer detects them simultaneously based on their unique mass spectra, reducing the number of separate tests from multiple immunoassays to one comprehensive test while maintaining measurement precision through mass spectral identification
Solution Approach 2:
The LC-MS/MS system serves as a universal platform for detecting multiple steroid hormones and metabolites simultaneously, replacing the need for multiple specialized immunoassays. This multi-functional approach reduces device complexity by consolidating what would otherwise require separate testing systems into a single versatile instrument
3Measurement precision
If GC-MS or LC-MS/MS with derivatization is used for small sample volumes, then detection sensitivity can be achieved, but the derivatization process is cumbersome and time-consuming
Solution Approach 1:
The patent extracts or removes the derivatization step from the analytical process by using direct injection LC-MS/MS methodology. The system achieves adequate detection sensitivity for small sample volumes without requiring the cumbersome derivatization chemistry, thereby simplifying the overall process while maintaining the ability to analyze trace levels of testosterone and other steroid hormones
Solution Approach 2:
The patent introduces an intermediary approach by using liquid chromatography as a separation and concentration mechanism before mass spectrometry detection. This intermediary LC step enables sensitive detection of small sample volumes through efficient separation and preconcentration, eliminating the need for derivatization while maintaining detection sensitivity
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 sensitive and specific detection of testosterone in small sample volumes, facilitating efficient diagnosis of conditions related to testosterone levels, such as congenital adrenal hyperplasia and hirsutism, with improved throughput and reduced need for serial dilutions.
Implementation Method 1
partially purifying the sample using supported liquid extraction
Implementation Method 2
chromatographically separating testosterone from the other components in the partially purified sample using liquid chromatography
Implementation Method 3
analyzing the chromatographically separated testosterone by mass spectrometry
Data Source
AI summary
Disclosed are methods and systems for the analysis of testosterone in a sample using supported liquid extraction and liquid chromatography-mass spectrometry.