Post-Mortem Oral Fluid Drug Testing via ELISA and LC-MS/MS
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Solution Overview
Problem
Current post-mortem forensic drug analysis methods using blood, urine, and liver tissue are time-consuming, invasive, and often unsuitable due to autolysis and sample degradation, necessitating a faster and less invasive approach for drug detection and quantification.
Innovation Solution
A method utilizing oral fluid collected from post-mortem subjects for rapid and sensitive detection and quantification of drugs through enzyme-linked immunosorbent assay (ELISA) and liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS), allowing for qualitative and quantitative analysis within three hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional biological matrices (blood, urine, liver tissue) are used for post-mortem drug analysis, then drug detection can be performed, but the analysis is time-consuming and sample quality degrades due to autolysis
Solution Approach 1:
The patent applies preliminary action by collecting oral fluid samples immediately after death before autolysis can occur. This prevents sample degradation beforehand, ensuring high-quality samples are available for rapid analysis within 3 hours, thus resolving the contradiction between maintaining detection sensitivity and reducing analysis time.
2Measurement precision
If traditional biological matrices are used for sample collection, then drug analysis can be conducted, but the collection process is invasive and requires protective gear
Solution Approach 1:
The patent extracts the sampling process from invasive internal body matrices (blood, urine, liver tissue) and relocates it to a non-invasive external matrix (oral fluid). This extraction eliminates the need for protective gear and complex collection procedures while maintaining the ability to accurately measure drug concentrations, thus resolving the contradiction between measurement precision and ease of operation.
3Adaptability or versatility
If multiple instrumentalities are employed for qualitative and quantitative analysis of traditional samples, then comprehensive drug screening is achieved, but the process becomes complex and time-consuming
Solution Approach 1:
The patent applies universality by developing a single analytical platform (LC-MS/MS) that can perform both qualitative screening and quantitative analysis across multiple drug classes (opioids, stimulants, depressants, cannabinoids, etc.). This multi-functional approach eliminates the need for multiple separate instrumentalities while maintaining comprehensive detection capabilities, thus resolving the contradiction between adaptability and device complexity.
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 provides faster, more sensitive, and less invasive drug testing compared to traditional methods, with results obtained in as little as three hours, and is capable of detecting a wide range of drugs, including those not detectable in blood or other matrices.
Implementation Method 1
analyzing the oral fluid sample qualitatively to detect the presence of one or more non-naturally occurring drugs
Implementation Method 2
analyzing the oral fluid sample quantitatively to determine concentration of the one or more non-naturally occurring drugs
Implementation Method 3
liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS)
Data Source
AI summary
The present invention provides a rapid, sensitive method for forensic drug testing in a post-mortem subject using oral fluid collected from the post-mortem subject. The method comprises collecting a sample of oral fluid from a post-mortem subject, analyzing the oral fluid sample qualitatively to detect the presence of one or more non-naturally occurring drugs, analyzing the oral fluid sample quantitatively to determine concentration of the one or more non-naturally occurring drugs in the post-mortem subject, and identifying the one or more non-naturally occurring drugs in the post-mortem subject. The detection and quantification in oral fluid is more sensitive and faster than detection and quantification of the non-naturally occurring drugs in blood, urine, bile, and liver tissue collected from the same post-mortem subject. Further, the qualitative and quantitative results are obtained in as little as three hours.