Polyacrylamide Gel Buffer System for Extended Shelf Life
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Solution Overview
Problem
Polyacrylamide gels with traditional Tris-glycine buffers at basic pH values tend to hydrolyze over time, leading to reduced migration accuracy and resolution of macromolecules due to interference from negative charges, and have a limited shelf life, especially when not refrigerated.
Innovation Solution
A polyacrylamide gel formulation using a gel amine buffer, a primary gel ampholyte, and a conjugate gel ampholyte such as threonine, maintained at a neutral pH, which provides improved stability and compatibility with downstream applications like silver staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional Tris-glycine buffers at basic pH are used in polyacrylamide gels, then macromolecule separation can be achieved, but the gels hydrolyze over time leading to reduced migration accuracy and limited shelf life
Solution Approach 1:
The patent changes the pH parameter from basic (traditional Tris-glycine) to neutral (pH 6.8-7.2), and modifies the buffer composition by replacing Tris with a combination of morpholinepropanesulfonic acid (MOPS) and N-cyclohexyl-2-ethanesulfonic acid (CHES). This parameter change prevents hydrolysis of the polyacrylamide gel while maintaining effective macromolecule separation, thereby extending shelf life without sacrificing separation performance
Solution Approach 2:
The patent uses a composite buffer system combining MOPS and CHES in specific ratios rather than a single buffer component. This composite approach creates a buffer system that maintains stable pH and ionic strength over time, preventing gel degradation while ensuring consistent electrophoresis performance throughout the extended shelf life
2Productivity
If basic pH buffers are used, then electrophoresis can proceed, but negative charges interfere with macromolecule migration and reduce resolution
Solution Approach 1:
The patent lowers the pH from basic conditions to a neutral range (6.8-7.2), which reduces the negative charge accumulation that interferes with macromolecule migration. This parameter change eliminates the 'smiling effect' and improves migration accuracy while maintaining sufficient ionic conductivity for electrophoresis to proceed effectively
3Duration of action of stationary object
If refrigeration is used to extend shelf life, then hydrolysis is reduced, but operational complexity and cost increase
Solution Approach 1:
The patent modifies the buffer pH and composition parameters to create a chemically stable environment that prevents hydrolysis at room temperature. By using MOPS and CHES buffers at neutral pH, the gel formulation achieves inherent stability without requiring refrigeration, thereby extending shelf life while simplifying storage and operational procedures
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
The neutral pH buffer system extends the shelf life of polyacrylamide gels, maintains sharpness in protein separation, and ensures effective macromolecule resolution, while being compatible with Tris-glycine buffers and downstream applications.
Implementation Method 1
Polyacrylamide gels with traditional Tris-glycine buffers at basic pH values tend to hydrolyze over time... The neutral pH buffer system extends the shelf life of polyacrylamide gels
Implementation Method 2
Gel electrophoresis is a common procedure for the separation of biological molecules... An electric potential is applied to the gel causing the sample macromolecules and tracking dye to migrate
Data Source
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AI summary
An electrophoresis gel with a gel buffer that includes a gel amine buffer, a primary gel ampholyte, and a conjugate gel ampholyte is disclosed herein. The conjugate gel ampholyte may be selected from threonine and serine.