Electroblot Transfer Buffer with Tricine for Rapid Semi-Dry Protein Transfer
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Solution Overview
Problem
Conventional semi-dry electroblotting methods using conventional filter paper result in low current and high resistance, leading to prolonged transfer times and excessive heat generation, necessitating the use of expensive alternative materials like polyester/cellulose blends for rapid transfers.
Innovation Solution
A semi-dry electroblotting transfer buffer composition containing tris, glycine, N-(2-hydroxy-1,1-bis(hydroxymethyl)ethyl)glycine (tricine), and optionally ethylenediaminetetraacetic acid (EDTA) is used with conventional cotton cellulose fiber filter paper, reducing electrical resistance and enabling high current transfers without excessive heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional filter paper is used in semi-dry electroblotting, then cost is reduced, but transfer time increases and heat generation becomes excessive
Solution Approach 1:
The patent changes the chemical composition parameters of the transfer buffer by adding tricine (10-100 mM) to the conventional tris-glycine buffer system. This parameter change modifies the buffer's electrical conductivity and resistance characteristics, enabling rapid transfer (<10 minutes) with conventional filter paper without excessive heat generation. The tricine addition optimizes the ionic strength and conductivity of the buffer, resolving the contradiction between using inexpensive conventional materials and achieving rapid transfer.
2Productivity
If high current is used for rapid transfer, then transfer time is reduced, but heat generation becomes excessive
Solution Approach 1:
The patent introduces tricine as an intermediary substance in the transfer buffer that mediates between high current requirements and heat generation. Tricine modifies the electrical properties of the buffer system, reducing resistance and improving current distribution. This intermediary chemical component enables high current flow for rapid transfer while preventing excessive localized heating, thus resolving the contradiction between transfer speed and heat generation.
3Device complexity
If conventional transfer buffer is used, then composition simplicity is maintained, but electrical resistance remains high
Solution Approach 1:
The patent creates a composite buffer system by combining conventional tris-glycine buffer components with tricine. This composite buffer formulation (containing tris, glycine, and tricine) achieves superior electrical conductivity and lower resistance compared to conventional single-component buffers. The composite nature of the buffer system allows it to maintain simplicity in application while dramatically improving electrical performance for rapid electroblotting.
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 efficient and rapid protein transfer to membranes using conventional filter paper, reducing transfer time to less than ten minutes with lower resistance and heat generation, eliminating the need for expensive alternative materials.
Implementation Method 1
electroblotting is a method to transfer proteins and/or nucleic acids that have been separated by gel electrophoresis onto a membrane
Implementation Method 2
current is directed through the transfer stack to drive the negatively charged molecules towards the anode
Implementation Method 3
the filter paper saturated with transfer buffer, i.e., 'semi-dry transfer'
Implementation Method 4
the transfer buffer contained in the filter paper provides the necessary ions, i.e., ion reservoir, for electroblotting transfer
Implementation Method 5
current is directed through the transfer stack to drive the negatively charged molecules towards the anode and onto the membrane
Implementation Method 6
More rapid semi-dry electroblot transfers can be achieved by increasing the ionic strength of the transfer buffer, e.g. 300 mM tris, 300 mM glycine
Implementation Method 7
in order to avoid excess heat generated during high current semi-dry electroblotting
Data Source
AI summary
A semi-dry, one step electroblot transfer buffer composition for rapid transfer of proteins or polypeptides from polyacrylamide gel to a suitable membrane such as nitrocellulose or polyvinylidene difluoride (PVDF). The composition contains components that minimized electrical resistance and enabled high efficiency rapid semi-dry transfer using conventional readily available filter paper, i.e., cotton cellulose fiber.