IGF-1 IGF-2 Quantification via Supercharged HPLC-MS
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Solution Overview
Problem
Current methods for quantifying Insulin-Like Growth Factor-1 (IGF-1) and Insulin-Like Growth Factor-2 (IGF-2) lack sufficient sensitivity, hindering diagnosis and treatment of various diseases.
Innovation Solution
The use of high-performance liquid chromatography (HPLC) with a mobile phase containing a supercharging reagent such as dimethyl sulfoxide (DMSO) and an organic acid, followed by mass spectrometry to detect ions in higher charge states, specifically the 8+ charge state, enhances the sensitivity of IGF-1 and IGF-2 detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional HPLC and mass spectrometry methods are used for IGF-1 and IGF-2 quantification, then the measurement can be performed, but the sensitivity is insufficient and the limit of detection is too high
Solution Approach 1:
The patent changes the chemical composition parameters of the mobile phase by introducing supercharging reagents (DMSO, tetrahydrothiophene-1,1-dioxide, or m-nitrobenzyl alcohol) at specific concentrations (0.1-5% v/v). This parameter modification transforms the ionization efficiency and charge state distribution of IGF-1 and IGF-2, shifting the dominant charge state to 8+ and significantly enhancing signal intensity, thereby improving sensitivity and lowering the limit of detection to as low as 0.5 ng/ml.
2Measurement precision
If the mobile phase composition is modified to include supercharging reagents, then the signal intensity of 8+ charge state ions increases, but the method complexity increases
Solution Approach 1:
Rather than modifying the physical structure or adding complex instrumentation, the patent resolves the contradiction by changing the chemical composition parameters of the existing mobile phase. The supercharging reagents are incorporated into the standard HPLC-MS workflow, maintaining the simplicity of the overall method while achieving enhanced signal intensity through optimized chemical conditions.
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 significantly increases the signal intensity of IGF-1 and IGF-2 ions in the 8+ charge state, lowering the limit of detection to as low as 0.5 ng/ml, thereby improving the analytical sensitivity and accuracy of IGF-1 and IGF-2 quantification.
Implementation Method 1
The HPLC comprises a mobile phase including a supercharging reagent and an organic acid; ionizing the sample to produce one or more ions detectable by mass spectrometry; determining an amount of IGF-1 ions in an 8+ charge state by mass spectrometry
Implementation Method 2
subjecting the sample to high-performance liquid chromatography (HPLC), wherein the HPLC comprises a mobile phase including a supercharging reagent and an organic acid
Data Source
AI summary
Disclosed herein are methods of determining a concentration of IGF-1 and/or IGF-2 with improved sensitivity using high performance liquid chromatography (HPLC) and mass spectrometry (MS). The methods can achieve improved sensitivity by using a supercharging reagent as part of a mobile phase of the HPLC, which can increase the amount of specific charge states of IGF-1 and/or IGF-2 ions detected by MS. An example method includes subjecting a sample to HPLC, wherein the HPLC comprises a mobile phase including a supercharging reagent and an organic acid; ionizing the sample to produce one or more ions detectable by mass spectrometry; determining amounts of IGF-1 ions in an 8+ charge state by mass spectrometry; and relating the amount of the determined IGF-1 ions in the 8+ charge state to the concentration of IGF-1 in the sample.