Nanochannel Bioseparation via Ionic Double Layer Overlap
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Solution Overview
Problem
Current polyacrylamide gel electrophoresis techniques for protein separation are hindered by inconvenience in gel preparation, limited resolution and dynamic range, susceptibility to degradation, incompatibility with mass spectrometric identification, and the need for large material volumes.
Innovation Solution
The development of nanostructured separation matrices in nanochannel devices that utilize ionic double layers and electrical potential differences to separate molecules, allowing for electrokinetic transport and pH modulation, enabling multidimensional separation strategies and integrated detection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If polyacrylamide gel electrophoresis is used for protein separation, then separation can be achieved, but gel preparation is inconvenient and irreproducible
Solution Approach 1:
The patent replaces the mechanical gel preparation system with a nanofluidic channel system. Instead of manually preparing polyacrylamide gels, the invention uses precisely fabricated nanochannels with controlled dimensions and surface properties that provide reproducible separation without manual gel casting operations.
Solution Approach 2:
The patent changes the physical parameters of the separation medium from bulk polyacrylamide gel to nanoscale channels with specific dimensional parameters (width, depth, length) and surface charge characteristics. This parameter control at the nanoscale enables reproducible separation performance without the variability inherent in manual gel preparation.
2Measurement precision
If polyacrylamide gel electrophoresis is used for protein separation, then separation can be achieved, but resolution and dynamic range are limited
Solution Approach 1:
The patent segments the separation process into multiple nanofluidic channels with different characteristics (different wall charges, different dimensions, different lengths). Each channel can be optimized for specific separation conditions, enabling both high resolution for individual separations and broad dynamic range across multiple separation dimensions simultaneously.
Solution Approach 2:
The patent transitions from two-dimensional gel electrophoresis to three-dimensional nanofluidic separation by utilizing channel depth, wall surface properties, and longitudinal variations in channel dimensions. This dimensional expansion provides additional separation mechanisms that increase both resolution and dynamic range.
3Reliability
If polyacrylamide gel electrophoresis is used for protein separation, then separation can be achieved, but the polymer is susceptible to degradation under high electric fields
Solution Approach 1:
The patent replaces the polyacrylamide polymer matrix with a solid nanofluidic channel structure (e.g., glass, silicon, or other inert materials). This substitution eliminates the polymer degradation issue entirely while maintaining the ability to perform electrophoretic separation through controlled electric fields applied to the fluid within the channels.
4Measurement precision
If polyacrylamide gel electrophoresis is used for protein separation, then separation can be achieved, but it is incompatible with mass spectrometric identification
Solution Approach 1:
The patent replaces the polyacrylamide gel system with a nanofluidic system that allows direct interface with mass spectrometry. The nanochannels can be designed with open ends or integrated interfaces that enable seamless transfer of separated molecules to mass spectrometry instruments, eliminating the incompatibility barrier between gel electrophoresis and mass spectrometry.
5Measurement precision
If polyacrylamide gel electrophoresis is used for protein separation, then separation can be achieved, but large volumes and concentrations of material are needed for detection
Solution Approach 1:
The patent nests the separation and detection functions within the same nanofluidic device. The nanochannels are designed to concentrate and focus molecular bands through geometric constraints and surface interactions, thereby reducing the total volume of sample material needed while maintaining detection sensitivity through the integrated detection system.
Solution Approach 2:
The patent changes the volume parameter from macroscopic gel electrophoresis to nanoscale channel dimensions. This parameter change reduces the sample volume requirement by several orders of magnitude while maintaining separation resolution through the nanoscale confinement and surface effects that dominate at this scale.
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
These nanochannel devices provide enhanced resolution, reproducibility, and compatibility with mass spectrometry, enabling efficient separation and analysis of biomolecules with improved purity evaluation and dynamic range.
Implementation Method 1
an ionic double layer forms in the fluid near each wall of the nanochannel and an ionic double layer formed along one wall of the nanochannel substantially overlaps an ionic double layer formed along an opposing wall of the nanochannel
Implementation Method 2
a first electrical potential difference can be applied to the fluid at the ends of the nanochannel to induce electrokinetic transport along the nanochannel
Implementation Method 3
The devices of the invention can be used to separate molecules including native and detergent-solubilized protein mixtures, protein complexes, nucleic acids (DNA and/or RNA)
Data Source
AI summary
The invention includes nanochannel devices and methods for using such nanochannel devices for separating molecules, ions and biomolecules. The nanochannel devices have at least one nanochannel through which fluid can move, wherein ionic double layers form in the fluid near walls of the nanochannel and those ionic double layers overlap within the nanochannel. Electrical voltage can be applied to the nanochannel to modify an electrostatic potential in the nanochannel and thereby control movement of ions and biomolecules through the nanochannel. The invention also includes arrays and networks of such nanochannel devices.