Stable Isotope Labeled Peptide Internal Standards for Mass Spectrometry
Solution Overview
Problem
Current methods for the measurement of biomarker proteins using mass spectrometry face challenges in the preparation, handling, and quantitative performance of stable isotope labeled peptides, particularly in improving the technology known as SISCAPA, which requires advancements in peptide enrichment and quantitation techniques.
Innovation Solution
The development of stable isotope labeled peptides as internal standards, which are synthesized with high isotopic purity and incorporated into carrier molecules for enhanced handling and quantitation, allowing for precise comparison of analyte concentrations through mass spectrometry by linking them to carriers like keyhole limpet hemocyanine (KLH) for improved solubility and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If stable isotope labeled peptides are synthesized with high isotopic purity, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses carrier molecules as intermediaries to simplify the handling and quantitation of stable isotope labeled peptides. The carrier serves as a mediator that allows easy measurement of peptide amounts through its own quantifiable properties, thereby improving measurement precision without requiring complex direct measurement methods for the peptides themselves
Solution Approach 2:
The patent changes the physical state or form of the stable isotope labeled peptides by conjugating them to carrier molecules. This parameter change enables easier handling and quantitation while maintaining the high isotopic purity needed for precise mass spectrometric measurements
2Ease of operation
If stable isotope labeled peptides are linked to carrier molecules, then ease of operation is improved, but device complexity increases
Solution Approach 1:
Carrier molecules serve as intermediaries that facilitate the handling of stable isotope labeled peptides. The carrier's larger size and different physical properties make it easier to handle, store, and quantify, while the stable isotope labeled peptide portion maintains its analytical utility in mass spectrometry
Solution Approach 2:
The system segments the functional requirements: the carrier molecule handles ease of operation, storage, and quantitation, while the stable isotope labeled peptide portion maintains measurement accuracy. This segmentation allows each component to optimize its specific function
3Measurement precision
If stable isotope labeled peptides are used as internal standards, then measurement precision is improved, but loss of substance increases
Solution Approach 1:
The carrier molecule acts as an intermediary that protects the stable isotope labeled peptide from loss during handling and preparation. The peptide can be stored and manipulated in a stable carrier-bound form, reducing degradation or adsorption losses, and then released for use as an internal standard
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 enables simplified interpretation of test results by providing stable, easily quantitated internal standards that facilitate precise comparison of analyte amounts, improving the accuracy and reliability of protein quantitation in complex samples, such as human plasma, and allows for personalized reference values.
Implementation Method 1
mass spectrometric assays for peptides
Data Source
AI summary
Methods for interpretation of mass spectrometric tests for clinical biomarkers in which the amounts of internal standards are set to equal clinical evaluation thresholds, and preparations for adding stable isotope labeled peptide species to sample digests while minimizing losses and alterations in peptide stoichiometry.