1H-NMR Analysis of Protein Polymer Modification Degree
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Solution Overview
Problem
Current methods for determining the modification degree of polymer-protein conjugates are imprecise, requiring multiple experimental measurements that can lead to errors and unnecessary discarding of desirable product batches, prolonging the development process and complicating quality control.
Innovation Solution
A method using 1H nuclear magnetic resonance (NMR) spectroscopy to quantify the number of covalently attached polymers to proteins in a single measurement, involving integration of specific proton peaks and calibration to determine the average number of polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple experimental measurements are used to determine modification degree, then comprehensive analysis is achieved, but measurement precision deteriorates due to cumulative errors
Solution Approach 1:
The patent combines protein concentration determination and polymer concentration determination into a single 1H-NMR measurement. The method simultaneously integrates signals from protein protons and polymer protons, allowing both concentrations to be determined from one experiment rather than requiring separate assays. This merging of measurements eliminates cumulative errors while reducing experimental complexity.
Solution Approach 2:
The 1H-NMR method serves multiple functions simultaneously: it determines protein concentration, polymer concentration, and modification degree in a single measurement. The universal applicability of 1H-NMR to both protein and polymer detection in the same sample eliminates the need for multiple specialized assays, thereby improving precision without adding complexity.
2Measurement precision
If classical assays are used to determine polymer concentration, then specific polymer measurement is achieved, but sample destruction occurs
Solution Approach 1:
The patent replaces destructive chemical assays (like Resorcinol assay requiring strong acid hydrolysis) with non-destructive 1H-NMR spectroscopy. Instead of chemically breaking down the sample to measure polymer concentration, the method uses magnetic resonance to detect polymer protons directly in the intact sample, eliminating sample destruction while maintaining measurement accuracy.
Solution Approach 2:
The 1H-NMR measurement acts as an intermediary that provides information about polymer concentration without requiring direct chemical interaction or destruction of the sample. The NMR signals serve as a non-invasive probe that extracts concentration data while leaving the sample intact for further analysis.
3Reliability
If multiple tests are performed to ensure product conformity, then quality control is improved, but productivity deteriorates due to time consumption
Solution Approach 1:
The patent merges multiple quality control tests into a single 1H-NMR measurement that simultaneously provides protein concentration, polymer concentration, and modification degree. This consolidation reduces the number of tests required to ensure product conformity, thereby improving productivity while maintaining reliability through the high precision of the combined measurement.
Solution Approach 2:
The single 1H-NMR measurement provides continuous information about all critical parameters (protein, polymer, and modification degree) in one experiment, eliminating the need for sequential testing. This continuous information acquisition accelerates the quality control process and speeds up production process development without compromising product reliability.
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
Provides highly precise modification degree analysis with reduced sample destruction and measurement time, minimizing errors and optimizing production processes.
Implementation Method 1
performing a 1H nuclear magnetic resonance measurement on the solution comprising the protein-first polymer conjugates
Data Source
AI summary
This invention provides, among other things, methods for determining the average number of first polymers covalently attached to protein-first polymer conjugates in a solution.