Blood Sampling Tube with PLD Inhibitor for PEth Accuracy
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Solution Overview
Problem
Existing methods for sampling and testing blood for the alcohol biomarker phosphatidylethanol (PEth) face challenges due to the activity of the enzyme phospholipase D (PLD) post-sampling, which can lead to in vitro formation of PEth, resulting in erroneous measurements and false interpretations, especially when using dried blood spot samples.
Innovation Solution
A device equipped with a test tube containing immobilized PLD inhibitors such as sodium metavanadate or sodium tungstate, which are effective in blocking the formation of PEth, ensuring accurate measurements by preventing PLD activity during and after blood sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dried blood spot sampling is used for PEth measurement, then sample collection convenience is improved, but post-sampling PEth formation occurs due to PLD activity
Solution Approach 1:
The test tube is pre-equipped with PLD inhibitor (sodium metavanadate or sodium tungstate) before blood sampling. This preliminary preparation ensures that when blood is collected, the inhibitor is already present to prevent PLD activity and in vitro PEth formation during storage and drying, thus maintaining measurement accuracy while preserving the convenience of blood spot sampling
Solution Approach 2:
The PLD inhibitor acts as an intermediary substance between the blood sample and the PLD enzyme. By introducing this intermediate agent (sodium metavanadate or sodium tungstate) into the test tube, it mediates the interaction by selectively inhibiting PLD activity without interfering with the subsequent PEth measurement, thus resolving the contradiction between sample convenience and measurement reliability
2Measurement precision
If PLD inhibitors are added to prevent in vitro PEth formation, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The sampling device merges multiple functions into a single integrated test tube: blood collection, PLD inhibition, and sample storage. By combining the inhibitor preparation and sampling container into one unified device, the complexity is minimized while achieving the goal of accurate PEth measurement through effective PLD inhibition
3Device complexity
If conventional blood sampling without inhibitors is used, then device simplicity is maintained, but false PEth formation leads to erroneous measurements
Solution Approach 1:
The invention uses a disposable test tube pre-loaded with a small amount of PLD inhibitor. This single-use device eliminates the need for complex reusable equipment while ensuring accurate measurements. The low cost and simplicity of the disposable test tube make it practical for routine use, resolving the contradiction between device simplicity and measurement accuracy
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
The use of PLD inhibitors in the test tube effectively prevents the formation of PEth post-sampling, providing a reliable, economical, and convenient assay for PEth analysis, reducing the risk of false interpretations and ensuring accurate results.
Implementation Method 1
The test tube includes at least one inhibitor of the enzyme phospholipase D (PLD) selected from at least one of a salt comprising a vanadium oxyanion and a salt comprising a tungsten oxyanion
Data Source
Figure 1
AI summary
A device configured for collection and subsequent testing of a blood sample of less than 10 ml, characterized in that the container includes at least one inhibitor of the enzyme phospholipase D selected from at least one of a salt of vanadium and a salt of tungsten. A method of preparing a sample for analysis of phosphatidylethanol (PEth) comprises providing a blood sample for a patient with a volume of less than 10 ml; contacting the blood sample at least one inhibitor of the enzyme phospholipase D selected from at least one of a salt of vanadium and a salt of tungsten; and admitting inhibition of phospholipase D so formation of PEth is blocked. A method of applying a coating of at least one inhibitor of the enzyme phospholipase D to a test tube and the test tube obtained by this method, wherein the method comprises stabilizing the test in a substantially vertical position; inserting a spray nozzle inside the test tube, the spray nozzle being in fluid connection to a container holding a solution comprising at least one inhibitor of the enzyme phospholipase D; spraying the solution comprising at least one inhibitor of the enzyme phospholipase D inside the test tube; and allowing the solution comprising at least one inhibitor of the enzyme phospholipase D to dry.