Pre-labeled Control Proteins for Gel Electrophoresis Normalization
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Solution Overview
Problem
Current methods for protein analysis, such as gel electrophoresis and Western blot analysis, face challenges including protein losses, inefficient protein visualization, and lack of standardized control mechanisms, leading to imprecise quantification and reproducibility issues, especially in routine diagnostic procedures and long-term clinical studies.
Innovation Solution
The method involves adding pre-labeled control proteins to biological samples to enable quantitative control and visualization of protein losses, standardize gel loading, and normalize protein signals across different gels and analyses, using fluorescent dyes for efficient labeling and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-electrophoretic staining with silver nitrate, Coomassie brilliant blue or fluorescent dyes is used for protein visualization, then proteins can be visualized and quantified, but the staining process is extremely time-consuming, not very sensitive, not very reproducible, and the gel can no longer be used for other applications such as Western blot analysis
Solution Approach 1:
The patent applies preliminary action by labeling proteins with fluorescent dyes before gel electrophoresis rather than performing post-electrophoretic staining. This allows the labeling reaction to occur on native proteins in solution, eliminating the time-consuming post-staining steps while maintaining quantification accuracy. The fluorescent labels are already attached to proteins when they are separated in the gel, enabling immediate detection without additional staining procedures.
Solution Approach 2:
The patent replaces the mechanical/chemical staining process with fluorescence detection. Instead of using silver nitrate reduction or Coomassie dye binding to visualize proteins after electrophoresis, the method uses fluorescently labeled proteins that can be directly detected by fluorescence imaging systems. This substitution eliminates the need for complex staining protocols and allows the gel to remain usable for Western blot analysis since no denaturation or fixation is required for fluorescence detection.
2Manufacturing precision
If gel electrophoresis is performed to separate proteins according to molecular weight, then proteins can be separated and visualized, but running time differences and different separation distances due to unevenly polymerized gel matrix or insufficient cooling can falsify results
Solution Approach 1:
The patent introduces fluorescently labeled control proteins as intermediary reference standards that migrate through the gel alongside sample proteins. These control proteins with known molecular weights serve as internal references to calibrate and normalize separation distances. By comparing the migration distances of sample proteins to the control protein bands on the same gel, researchers can accurately determine molecular weights even when running conditions vary between gels or within a gel, thereby ensuring result consistency and reliability.
3Measurement precision
If Western blot analysis is performed to detect target proteins using specific antibody reactions, then target proteins can be specifically detected, but the success of the analysis can only be checked at the very end, and if transfer was disrupted or loading was uneven, this only becomes visible through final staining
Solution Approach 1:
The patent implements feedback by incorporating fluorescently labeled control proteins that provide continuous monitoring of sample preparation quality, gel loading uniformity, and electrophoresis performance throughout the workflow. These control proteins generate visible fluorescence signals that immediately indicate whether samples were loaded correctly and whether electrophoresis separated proteins as expected. This real-time feedback allows researchers to identify and correct problems before proceeding to antibody-based Western blot detection, saving time and resources by preventing propagation of errors through the entire analysis pipeline.
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 allows for early detection of errors in protein analysis, optimizing sample preparation and purification, ensuring uniform loading and transfer, and reducing false-positive or false-negative results, thereby enhancing the reliability and efficiency of protein analysis.
Implementation Method 1
The fluorescence marker, for example, offers a quick, uncomplicated and highly sensitive way of visualizing proteins. The labeling reaction is based on a chemical reaction of the appropriately activated fluorescent dyes and the amino acid residues of the proteins.
Implementation Method 2
During gel electrophoresis, complex protein mixtures are separated in a gel matrix (usually based on polyacrylamide or agarose) according to specific parameters
Data Source
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AI summary
The invention relates to a method for monitoring sample preparation, sample purification, and/or sample separation of biological samples, as well as chemical labeling reactions and antibody reactions in biochemical analysis and medical diagnostics, using pre-labeled control proteins. The method according to the invention particularly includes a step of normalizing the measured concentrations of target proteins based on the known concentration of pre-labeled control proteins. The invention further relates to a kit for carrying out the method, wherein the kit comprises at least one labeled control protein or at least one unlabeled control protein, a dye, and instructions for labeling the control protein with the dye. The invention further relates to the use of the method and the kit for quality control in biochemical analysis and medical diagnostics.