Boronic Acid Extraction for Catecholamine Mass Spectrometry
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Solution Overview
Problem
Current methods for detecting epinephrine, norepinephrine, and dopamine by mass spectrometry face challenges in accurately quantifying these catecholamines in biological samples, particularly in urine, due to interference from other substances and limitations in simultaneous detection of multiple analytes.
Innovation Solution
The method involves purifying catecholamines using immobilized boronic acid extraction followed by tandem mass spectrometry, allowing for the simultaneous detection of epinephrine, norepinephrine, and dopamine in a single sample injection by generating specific ions with defined mass-to-charge ratios, and using internal standards for accurate quantitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional mass spectrometry methods are used for detecting catecholamines, then detection capability is provided, but measurement precision and accuracy deteriorate due to interference from other substances in biological samples
Solution Approach 1:
The patent applies extraction principle by using solid-phase extraction with boronic acid-functionalized cartridges to selectively extract catecholamines (epinephrine, norepinephrine, dopamine) from complex biological matrices such as urine and plasma. This extraction step separates the target analytes from interfering substances, thereby improving measurement precision and accuracy by eliminating matrix effects that would otherwise interfere with mass spectrometric detection.
Solution Approach 2:
The patent employs boronic acid as an intermediary substance that forms reversible complexes with catecholamines through diol-boronic acid interactions. This intermediary mechanism enables selective retention and enrichment of catecholamines on the solid-phase extraction cartridge, allowing for their subsequent elution and detection while leaving other interfering substances behind, thus resolving the contradiction between detection capability and interference resistance.
2Productivity
If multiple catecholamines are detected separately by mass spectrometry, then individual detection accuracy is maintained, but productivity decreases due to multiple sample injections required
Solution Approach 1:
The patent merges the detection of multiple catecholamines (epinephrine, norepinephrine, and dopamine) into a single mass spectrometric analysis run. By using multiple reaction monitoring (MRM) transitions specific to each analyte, the method enables simultaneous quantification of all three catecholamines from one extracted sample, thereby improving productivity while maintaining measurement precision through targeted ion monitoring and internal standard normalization.
Solution Approach 2:
The patent creates a universal analytical method that can detect and quantify multiple different catecholamines using the same sample preparation protocol and mass spectrometric parameters. The boronic acid-based extraction cartridge serves multiple functions: it extracts all three catecholamines simultaneously, concentrates them, and prepares them for unified analysis, thus achieving multi-analyte detection without compromising individual quantification accuracy.
3Measurement precision
If sample concentration is increased to improve detection sensitivity, then limit of quantitation improves, but harmful factors from concentrated interfering substances increase
Solution Approach 1:
The patent applies extraction principle by using solid-phase extraction with boronic acid-functionalized cartridges to selectively extract catecholamines (epinephrine, norepinephrine, dopamine) from complex biological matrices such as urine and plasma. This extraction step separates the target analytes from interfering substances, thereby improving measurement precision and accuracy by eliminating matrix effects that would otherwise interfere with mass spectrometric detection.
Solution Approach 2:
The patent employs selective extraction that concentrates catecholamines specifically while leaving other substances behind, creating a localized enrichment of target analytes without proportionally concentrating interferents. This local quality approach allows sensitivity improvement through analyte concentration while minimizing the harmful effects of concentrated interfering substances.
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 precise and simultaneous detection of epinephrine, norepinephrine, and dopamine in urine samples, improving sensitivity and accuracy, with a limit of quantitation within the range of 2-20 μg/L, suitable for clinical applications.
Implementation Method 1
purifying catecholamines using immobilized boronic acid extraction
Implementation Method 2
subjecting the sample to ionization under conditions suitable to produce one or more ions detectable by mass spectrometry
Implementation Method 3
determining the amount of the one or more ions by tandem mass spectrometry
Data Source
AI summary
Provided are methods for determining the amount of one or more of one or more of epinephrine (E), norepinephrine (NE), and dopamine (D) in a sample using mass spectrometry. The methods generally involve ionizing one or more of E, NE, and D in a sample and detecting and quantifying the amount of the ion to determine the amount of one or more of E, NE, and D in the sample.