Capillary Microsample Analysis Using Stabilizing Buffer
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Solution Overview
Problem
Current methods for measuring drug levels and pharmacogenetic information in bodily fluids are inaccurate and inconvenient, especially for vulnerable populations like infants and the elderly, as they require invasive procedures and cannot verify sample donor identity, and do not allow for simultaneous analysis of small blood volumes.
Innovation Solution
The method involves analyzing capillary microsamples diluted in a stabilizing buffer containing isopropanol, ethanol, or methanol, which enables simultaneous measurement of drug levels and genotyping, allowing for personalized medicine strategies and verifying sample donor identity through genotyping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If venipuncture is used to obtain plasma for diagnostic tests, then sufficient sample volume is obtained for analysis, but the procedure becomes invasive and difficult for vulnerable populations
Solution Approach 1:
The patent extracts only the essential component (capillary blood sample) needed for analysis, eliminating the need for invasive venipuncture. By using capillary tubes to collect small volumes of blood from less invasive sources, the method obtains sufficient sample for both drug level and genotyping analysis without requiring large plasma volumes from difficult-to-access veins.
Solution Approach 2:
The patent changes the required sample volume parameter from milliliters (venipuncture plasma) to microliters (capillary blood). This parameter change enables sample collection from vulnerable populations while maintaining adequate material for comprehensive analysis including drug concentration measurement and pharmacogenetic testing.
2Ease of operation
If filter paper is used for blood sample collection, then sample collection is simplified, but measurement accuracy is significantly reduced
Solution Approach 1:
The patent uses disposable capillary tubes instead of reusable filter paper systems. These inexpensive, single-use tubes maintain sample integrity while enabling accurate quantitative analysis. The capillary tubes preserve blood in liquid form rather than absorbing it into paper, ensuring precise measurement of drug levels and nucleic acid quality.
3Adaptability or versatility
If separate testing procedures are used for drug levels and pharmacogenetic information, then comprehensive analysis is achieved, but the process becomes complex and requires multiple samples
Solution Approach 1:
The patent merges drug level analysis and pharmacogenetic testing into a single integrated workflow using one capillary blood sample. The stabilizing buffer preserves both drug molecules and nucleic acids simultaneously, allowing parallel processing for both therapeutic drug monitoring and pharmacogenetic testing without requiring separate sample collections or complex coordination between different testing procedures.
Solution Approach 2:
The stabilizing buffer composition is designed with universal functionality to preserve multiple analyte types (drugs, metabolites, and nucleic acids) simultaneously. This multi-functional approach allows a single sample to serve multiple diagnostic purposes, eliminating the need for separate specialized samples for different types of analysis.
4Ease of operation
If conventional sampling methods are used, then sample collection is straightforward, but sample donor identity verification is not possible
Solution Approach 1:
The patent introduces genotyping analysis as an intermediary method to verify sample donor identity. By analyzing pharmacogenetic markers in the capillary blood sample, the system creates a biological fingerprint that confirms the sample comes from the intended donor, adding a verification layer without complicating the actual collection process.
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 provides accurate and convenient measurement of drug levels and pharmacogenetic information from small blood samples, enabling personalized medicine and ensuring sample authenticity, thus improving healthcare for vulnerable populations.
Implementation Method 1
the test mixture comprises the capillary microsample diluted into a stabilizing buffer comprising isopropanol, ethanol, methanol, or a combination thereof
Data Source
AI summary
Provided are methods of analyzing a capillary microsample obtained from a subject. In certain embodiments, the methods comprise assessing a test mixture for one or more capillary microsample analytes, wherein the test mixture comprises the capillary microsample diluted into a stabilizing buffer comprising isopropanol, ethanol, methanol, or a combination thereof. Such methods further comprise analyzing capillary microsample nucleic acids purified from the test mixture. According to some embodiments, analyzing the capillary microsample nucleic acids comprises genotyping the subject. Methods of determining one or more alleles of a subject are also provided, as are kits that find use in practicing the methods of the present disclosure.