Dry Gel Loading Compositions for Electrophoresis
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Solution Overview
Problem
Current gel loading compositions for electrophoresis require a liquid form and are not easily resoluble, leading to inefficiencies in workflow and variable results, especially in TBE gels, due to the use of substances like Ficoll and glycerol which do not dry completely or resuspend well.
Innovation Solution
A dry composition comprising a tracking dye and a sedimenting agent, such as ribitol, which can be easily rehydrated and provides sufficient density for nucleic acid samples, allowing for sharp resolution in both TAE and TBE gels, eliminating the need for separate mixing and storage steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid loading compositions (Ficoll, glycerol) are used, then nucleic acid samples can be loaded onto gels, but the compositions do not dry completely and are difficult to resuspend, leading to variable results and workflow inefficiencies
Solution Approach 1:
The patent changes the physical state parameter of the loading composition from liquid to dry powder form. This transformation allows the composition to be completely dried and stored stably, while still being easily resuspended in aqueous buffers before use, thereby improving both reliability and ease of operation
Solution Approach 2:
The patent creates a composite dry powder composition combining tracking dyes (such as bromophenol blue and xylene cyanol) with sedimenting agents (such as ribitol, arabitol, xylitol, or sorbitol). This composite formulation ensures complete drying, stable storage, and easy resuspension, resolving the technical contradictions regarding reliability and ease of operation
2Ease of operation
If glycerol is used as a sedimenting agent, then nucleic acid samples can be loaded, but glycerol interacts with boric acid in TBE gels to form negatively charged esters that migrate and cause smearing of nucleic acid bands
Solution Approach 1:
The patent extracts glycerol from the loading composition formulation and replaces it with alternative sedimenting agents such as ribitol, arabitol, xylitol, or sorbitol. These alternatives do not interact with boric acid to form charged esters, thereby eliminating the harmful effect of band smearing in TBE gels while maintaining ease of sample loading
Solution Approach 2:
The patent employs short-chain polyols (ribitol, arabitol, xylitol, sorbitol) as replaceable sedimenting agents that function effectively for the purpose of increasing sample density without generating harmful interactions in TBE buffers, thus avoiding the band smearing problem caused by glycerol
3Manufacturing precision
If Ficoll is used as a sedimenting agent, then nucleic acid diffusion is reduced providing sharper bands, but Ficoll requires refrigerated storage to prevent contamination and must be used in liquid form requiring separate mixing receptacles
Solution Approach 1:
The patent merges the tracking dye and sedimenting agent into a single dry powder composition that can be directly added to nucleic acid samples. This eliminates the need for separate mixing receptacles and refrigerated storage, reducing device complexity while maintaining band sharpness through the inclusion of appropriate sedimenting agents
Solution Approach 2:
The patent changes the storage condition parameter from refrigerated to ambient temperature by using dry powder formulations with alternative sedimenting agents that do not support microbial growth. This eliminates the need for refrigerated storage and separate mixing equipment, reducing overall system complexity
4Difficulty of detecting and measuring
If tracking dyes are added to monitor nucleic acid migration, then visual assurance of proper loading and migration direction is provided, but the dyes increase the volume of the sample requiring pipette adjustment
Solution Approach 1:
The patent optimizes the concentration parameters of tracking dyes in the dry powder composition to provide sufficient visual signal for monitoring nucleic acid migration while minimizing volume expansion. This allows direct addition to samples without requiring pipette adjustment, maintaining ease of operation
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 dry composition enables efficient and stable gel loading with quick resuspension and optimal band resolution in both TAE and TBE gels, improving workflow efficiency and consistency.
Implementation Method 1
A dry composition comprising a tracking dye and a sedimenting agent... which can be easily rehydrated
Implementation Method 2
a sedimenting agent, such as ribitol, which can be easily rehydrated and provides sufficient density for nucleic acid samples, allowing for sharp resolution
Implementation Method 3
The process of agarose gel electrophoresis involves the formation of a solidified agarose slab gel... submerged in a buffer that allows for the conduction of an electrical current through the agarose which facilitates the migration of the nucleic acids
Data Source
AI summary
The invention provides dry compositions for preparing and loading a sample on a gel for electrophoretic separation. The dry compositions preferably include a tracking dye and a sedimenting agent selected from a five-carbon polyol (e.g., ribitol, arabitol, or xylitol),iso-erythritol, maltitol, and saccharine. Methods for making and using, as well as kits comprising the disclosed compositions, are also provided.