Aqueous Transfer Buffer for Broad Molecular Weight Proteins
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrophoretic transfer methods for macromolecules, particularly proteins of low molecular weight, face inefficiencies in transferring proteins across a broad range of molecular weights, with current buffers often failing to maintain high transfer efficiency for proteins below 20 kDa.
Innovation Solution
An aqueous transfer buffer comprising 300 mM Tris and 300 mM glycine, with an optional pH of 9.0 and inclusion of up to 20% ethanol or 0.1% SDS, demonstrates improved transfer efficiency for proteins across a wide molecular weight range by optimizing the ionic strength and pH conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transfer buffers (e.g., Towbin buffer with 25 mM Tris, 192 mM Glycine) are used, then the transfer process is simple and well-established, but transfer efficiency for low molecular weight proteins (below 20 kDa) is poor
Solution Approach 1:
The patent applies parameter changes by significantly increasing the concentrations of Tris (to 300 mM) and glycine (to 300 mM) in the transfer buffer, and adjusting the pH to 9.0. These parameter modifications directly address the technical contradiction by improving transfer efficiency for low molecular weight proteins while maintaining a relatively simple buffer system composed of only two main components.
2Reliability
If higher concentrations of Tris and glycine are used to improve low molecular weight protein transfer, then transfer efficiency increases, but the ionic strength of the buffer increases which may affect electrophoresis conditions
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including Tris concentration (300 mM), glycine concentration (300 mM), and pH (9.0) to achieve high transfer efficiency while managing ionic strength. The balanced composition of these parameters allows effective transfer across a broad molecular weight range without compromising buffer stability.
3Reliability
If additional components like ethanol, methanol, or SDS are added to the buffer, then transfer efficiency for certain proteins improves, but the buffer composition becomes more complex and may interfere with downstream applications
Solution Approach 1:
The patent demonstrates that high transfer efficiency can be achieved through optimized concentrations of Tris (300 mM) and glycine (300 mM) at pH 9.0 alone, without requiring additional components like ethanol, methanol, or SDS. This simplifies the buffer composition while maintaining reliable transfer across a broad molecular weight range, and allows optional addition of these components at controlled levels (≤20% ethanol/methanol or ≤0.1% SDS) only when needed for specific applications.
Data Source
Figure 1A~1C
Figure 2~3
Figure 4
AI summary
The present invention relates to an aqueous transfer buffer that provides superior efficiency in transferring polypeptides of a broad range of molecular weight from a matrix used in electrophoresis to another immobilized surface. Also disclosed are electrophoretic methods and devices in which the aqueous transfer solution of this invention is used.