PLP Plasma Quantification by LC-MS/MS for Precise Vitamin B6 Testing
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Solution Overview
Problem
Existing methods for detecting the active form of vitamin B6, pyridoxal 5′-phosphate (PLP), in plasma suffer from imprecision and require lengthy sample preparation and analysis.
Innovation Solution
The use of tandem mass spectrometry (MS-MS) coupled with liquid chromatography to detect and quantify PLP in plasma samples, involving purification steps such as HTLC and HPLC, and the use of an internal standard for enhanced accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional HPLC-based or enzymatic assays are used to measure vitamin B6, then the measurement can be performed, but the precision and reliability are insufficient due to observed imprecision among existing assays
Solution Approach 1:
The patent replaces conventional HPLC-based or enzymatic detection systems with tandem mass spectrometry (MS-MS). This substitution utilizes mass-to-charge ratio detection instead of conventional chromatographic or enzymatic measurement, providing superior precision and reliability through direct molecular ion detection and fragmentation pattern analysis, thereby resolving the imprecision issues of existing assays
Solution Approach 2:
The patent changes the detection parameter from conventional chromatographic retention time or enzymatic activity to mass-to-charge ratio (m/z). By monitoring specific m/z transitions (parent ion to daughter ion), the method achieves enhanced measurement precision and reliability, as mass spectrometry provides exact molecular mass information that is inherently more precise than conventional methods
2Productivity
If conventional detection methods are used, then the analysis can be performed, but the sample preparation and analysis time are lengthy
Solution Approach 1:
The patent replaces time-consuming conventional HPLC separation and detection with tandem mass spectrometry. MS-MS requires minimal sample preparation and provides rapid analysis through direct ionization and mass analysis, eliminating lengthy chromatographic runs and enabling high-throughput measurement of PLP concentrations
Solution Approach 2:
The patent skips the lengthy chromatographic separation step by using tandem mass spectrometry with selected reaction monitoring (SRM). The method directly ionizes sample components and monitors specific mass transitions, rushing through the analysis process in minutes rather than hours, thereby significantly improving productivity while reducing time loss
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 a high-throughput, precise, and sensitive assay for detecting PLP in plasma, capable of quantifying PLP in the range of 2 ng/mL to 250 ng/mL, and is suitable for clinical diagnostics.
Implementation Method 1
liquid chromatography-tandem mass spectrometry can be used to measure vitamin B6 in human plasma
Implementation Method 2
generating a parent ion of PLP from the purified sample; generating one or more daughter ions of the parent ion; detecting the presence or amount of one or more ions
Data Source
AI summary
Provided are methods of detecting the presence or amount of the active form of vitamin B6, pyridoxal 5′-phosphate, in a body fluid sample using tandem mass spectrometry coupled with liquid chromatography.