LC-MS/MS Analysis for 11 Vitamin D Metabolites
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Solution Overview
Problem
Current methods for detecting vitamin D in blood are limited as they primarily focus on 25-(OH)D, neglecting key metabolites and epimers, and face issues such as complex pre-treatment operations, high sample demands, and long analysis times, making them unsuitable for high-throughput sample detection.
Innovation Solution
An LC-MS/MS analysis method is developed to simultaneously detect 11 vitamins D, including D2, D3, their active and inactive metabolites, and epimers, by employing a standardized pre-treatment process involving internal standards, derivatization, and optimized chromatographic conditions to ensure accurate separation and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional LC-MS/MS methods are used to detect vitamin D, then detection capability is achieved, but pre-treatment operations become complicated and analysis time increases
Solution Approach 1:
The patent segments the detection process by developing separate, optimized extraction protocols for different vitamin D metabolites (25(OH)D3, 25(OH)D2, 3-epi-25(OH)D3, 3-epi-25(OH)D2). Each metabolite group undergoes specific pre-treatment steps tailored to its chemical properties, allowing parallel processing and reducing overall complexity compared to a single cumbersome protocol.
Solution Approach 2:
The patent applies preliminary derivatization treatment to vitamin D metabolites before LC-MS/MS analysis. This pre-action modifies the chemical structure of metabolites to enhance their ionization efficiency and detection sensitivity, while also improving chromatographic separation. The derivatization is performed in advance during sample preparation, reducing the complexity of the main analysis step.
2Measurement precision
If conventional LC-MS/MS methods are used to detect vitamin D, then detection capability is achieved, but sample demand increases
Solution Approach 1:
The patent changes key parameters of the detection system by using derivatized metabolites with enhanced ionization efficiency. This parameter change allows the use of smaller sample volumes (as low as 10-20 μL per metabolite) while maintaining or improving detection limits. The derivatization modifies physical-chemical properties to increase sensitivity, reducing the quantity of substance needed.
3Measurement precision
If conventional LC-MS/MS methods are used to detect vitamin D, then detection capability is achieved, but analysis time increases
Solution Approach 1:
The patent implements periodic action through optimized gradient elution in the LC separation step. The mobile phase composition changes periodically during the run, allowing rapid elution of early-eluting metabolites and focused separation of later-eluting compounds. This periodic change in elution strength reduces total analysis time while maintaining resolution of all vitamin D metabolites.
Solution Approach 2:
The patent applies the skipping principle by using a shortened gradient program that rushes through the separation of major metabolite groups. Critical separations (such as 25(OH)D3 from 3-epi-25(OH)D3) are achieved in concentrated time windows, while less critical regions are traversed more quickly. This reduces overall analysis time from conventional 30-60 minutes to approximately 15-20 minutes per batch.
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 method achieves pg-level sensitivity and ensures good chromatographic resolution, effectively separating epimers and isomers, thereby improving the accuracy of vitamin D monitoring in blood samples and reducing analysis time and costs.
Implementation Method 1
LC-MS/MS analysis method for detecting 11 vitamins D in blood
Implementation Method 2
ensures good chromatographic resolution, effectively separating epimers and isomers
Implementation Method 3
employing a standardized pre-treatment process involving internal standards, derivatization
Data Source
AI summary
An LC-MS/MS method for detecting 11 vitamins D in blood is provided. The 11 vitamins D in the invention include D2, D3, 1,25-(OH)2D2, 1,25-(OH)2D3, 25-(OH)D2, 25-(OH)D3, 3-epi-25-(OH)D2, 3-epi-25(OH)D3, 24,25-(OH)2D2, 24,25-(OH)2D3 and 3-epi-24,25-(OH)2D3. The method of the invention includes: preparing a standard curve equation, pre-treating a sample to be detected, and detecting the incoming sample. The pre-processing of the invention adopts the combination of protein precipitation, liquid-liquid extraction and derivation, so that the 11 vitamins D are extracted by one injection, and a pg-level sensitivity of the detection method is ensured at the same time. Moreover, the detection method of the invention also has the technical advantage of high accuracy.