Direct LC-MS Quantification of Phosphate Molecules
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Solution Overview
Problem
Current analytical methods for quantifying chemically complex molecules like inositol polyphosphates in biological matrices face challenges due to their highly charged and polar nature, lack of absorption bands in the UV-Vis spectrum, and matrix effects, leading to sensitivity and specificity issues, especially at low concentrations.
Innovation Solution
A direct liquid chromatography methodology using a polar solvent system with a buffered pH between 7 and 14, passing through a chromatographic column with small particles of a non-polar stationary phase, and detecting using mass or radioactivity detectors to identify retention time and signal intensity, allowing for the direct detection and quantification of chemically complex molecules with molecular weights of at least 200 within biological matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct UV-Vis spectrophotometric methods are used for quantification, then the method is simple and quick, but the molecules lack absorption bands in the UV-Vis spectrum region making quantification impossible
Solution Approach 1:
The patent uses mass spectrometry as an intermediary detection method. Instead of directly detecting the analyte through UV-Vis absorption, the method ionizes the molecules and detects them based on their mass-to-charge ratio. This intermediary approach (ionization and mass analysis) enables detection of molecules that lack UV-Vis absorption bands, resolving the contradiction between simplicity and detectability.
2Measurement precision
If conventional LC-MS methods are used for determination, then derivatization or fragmentation steps are added, but this makes the method more complex and less applicable for routine analysis
Solution Approach 1:
The patent extracts and eliminates the problematic derivatization and fragmentation steps from the analytical method. By using a direct LC-MS approach without these additional processing steps, the method maintains high accuracy while significantly reducing complexity, making it suitable for routine clinical analysis.
Solution Approach 2:
Instead of the conventional approach where analytes are modified (derivatized or fragmented) to enhance detectability, the patent inverts the strategy by directly analyzing the intact molecules using mass spectrometry. This inversion eliminates the need for complex sample preparation while maintaining measurement precision.
3Measurement precision
If current analytical methods are used for low concentration analytes in biological matrices, then the matrix effects suppress the analyte response, but this leads to differences in response between sample in matrix and standards causing quantitative analysis difficulties
Solution Approach 1:
The patent employs stable isotope-labeled internal standards as intermediaries to compensate for matrix effects. These labeled standards co-elute with the analytes and experience the same matrix suppression, allowing for accurate correction and quantification by comparing analyte-to-standard response ratios, thus eliminating matrix effect interference.
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 high sensitivity and specificity, enabling the quantification of chemically complex molecules and related impurities in various biological matrices, even at low concentrations, with improved reproducibility and applicability to diverse biological samples.
Implementation Method 1
passing through a chromatographic column with small particles of a non-polar stationary phase
Implementation Method 2
detecting using mass or radioactivity detectors to identify retention time and signal intensity
Implementation Method 3
A direct liquid chromatography methodology using a polar solvent system with a buffered pH between 7 and 14
Data Source
AI summary
The present invention relates to method for the direct detection and/or quantification of at least one compound with a molecular weight of at least 200, wherein the compound to be detected and/or quantified is a chemically complex molecule, wherein said chemically complex molecule is substituted with at least two groups R, wherein each R group means independently —OH, —OP(O)(OH)2 or —P(O)(OH)2, with the proviso that at least two R are independently selected from —P(O)(OH)2 and —OP(O)(OH)2, wherein the compound or compounds to be detected and/or quantified are within a biological matrix, wherein said biological matrix is a biological fluid, a biological tissue, stomach contents, intestine contents, stool sample or a culture cells, wherein the method comprises performing a chromatography and identifying the retention time and/or the intensity of the signal by means of a mass or radioactivity detector.