MALDI Mass Spectrometry Polymer Quantification Using Small Molecule Internal Standards
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Solution Overview
Problem
MALDI mass spectrometry faces challenges in quantitative analysis due to peak overlap when using polymer internal standards or matrix signals, leading to reduced accuracy.
Innovation Solution
A method involving the preparation of polymer specimens with uniform thickness using electrospray and a mask, combined with a small molecule internal standard, to reduce peak overlap and enhance quantitative analysis accuracy in MALDI-MS spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polymer internal standard is used for quantitative analysis, then the quantitative calibration line can be prepared, but peak overlap occurs reducing measurement precision
Solution Approach 1:
The patent extracts the internal standard function from polymer molecules and assigns it to small molecule compounds instead. This separation eliminates the peak overlap problem that occurs when using polymer internal standards, as small molecules produce distinct, non-overlapping peaks in the mass spectrum while still providing the necessary internal standard signals for quantitative calibration
2Measurement precision
If matrix signals are used for quantitative analysis, then the quantitative calibration line can be prepared without separate internal standard, but peak overlap between matrix peaks and other peaks reduces measurement precision
Solution Approach 1:
The patent extracts the internal standard function from the matrix and introduces separate small molecule internal standard compounds. This eliminates the peak overlap between matrix peaks and analyte peaks, as the small molecule internal standards produce distinct peaks that do not overlap with matrix or sample peaks, thereby improving measurement precision
Solution Approach 2:
The patent introduces small molecule internal standard compounds as intermediary substances that mediate between the matrix and the polymer analyte. These intermediaries provide distinct spectral signals that do not overlap with either matrix or sample peaks, enabling accurate quantitative analysis without the harmful peak overlap effects
3Manufacturing precision
If electrospray method is used to prepare specimens, then uniform thickness can be achieved, but additional equipment and process complexity are required
Solution Approach 1:
The patent makes the mask serve multiple functions: it acts as both a support substrate for the electrospray process and a thickness control element. By depositing material through the mask, it simultaneously provides structural support and ensures uniform thickness, reducing the need for additional specialized equipment
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 results in a reproducible MALDI mass spectrum with reduced peak overlap, enabling more accurate relative quantitative analysis of polymers with a thickness variation of 30% or less and a relative standard deviation of ±15% or less.
Implementation Method 1
preparing a plurality of polymer specimens having a thickness variation of 30% or less by electrospraying a solution containing a polymer sample, a small molecule internal standard and a matrix through a mask
Implementation Method 2
MALDI (matrix-assisted laser desorption ionization) is a technique that indirectly ionizes specimens through a matrix, which is easy for mass spectrometry of polymers
Data Source
AI summary
A method for relative quantitative analysis of a polymer using MALDI mass spectrometry, the method comprising the steps of preparing a plurality of polymer specimens having a thickness variation of 30% or less by electrospraying a solution including a polymer sample, a monomeric internal standard material, and a matrix through a mask for each different concentration of the polymer sample; obtaining MALDI mass spectra by irradiating laser beams to each of the plurality of polymer specimens, and calculating a signal intensity ratio of the polymer sample to the small molecule internal standard from peak results of the spectra; and depicting the calculated signal intensity ratio according to the concentration of the polymer sample to prepare a quantitative calibration curve, and the method capable of providing MALDI mass spectra with reduced overlapping peaks and thereby providing the relative quantitative analysis of a polymer with improved accuracy.