Nanogap Detector for DNA Base Resolution
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Solution Overview
Problem
Existing devices for analyzing small bio-molecules like DNA face limitations in resolving single DNA base pairs due to poor confinement and noise effects, especially when relying on ionic current blockage through nanopores, which cannot sufficiently distinguish adjacent DNA bases.
Innovation Solution
A nanogap detector system that draws samples into a nanofluidic channel, stretches them into a linear chain, and constrains them through a nanogap between detector elements, allowing for real-time, label-free analysis by observing electrical or optical signals as they pass through, thereby enhancing resolution and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If devices rely upon pulling strands of molecules through nanopores and measuring ionic current blockage, then detection capability is achieved, but measurement precision deteriorates due to poor confinement and noise effects
Solution Approach 1:
The device segments the DNA strand into discrete sections as it passes through the nanopore, with each section corresponding to specific base pairs. This segmentation allows individual base pairs to be resolved by detecting changes in ionic current blockage patterns at different positions along the pore, thereby improving measurement precision while maintaining signal stability through systematic detection of segmented signals.
Solution Approach 2:
The patent introduces an intermediary mechanism where the nanopore acts as a mediator between the DNA strand and the detection system. The nanopore confines the DNA strand and translates molecular information into measurable ionic current blockage patterns, serving as an intermediary that enhances both measurement precision and signal reliability by providing a controlled interaction interface.
2Measurement precision
If devices use ionic current blockage detection through nanopores, then DNA analysis capability is achieved, but measurement precision deteriorates due to random movement of DNA base pairs outside the nanopore
Solution Approach 1:
The device extracts only the relevant portion of the DNA strand by confining it within the nanopore during detection. By taking out the DNA segment of interest and isolating it within the pore structure, the system eliminates noise from random movements of unrestrained portions, thereby improving the distinction between adjacent DNA bases while maintaining detection capability.
Solution Approach 2:
The nanopore provides a localized detection zone with specific geometric and electrical properties optimized for DNA analysis. This local quality enhancement creates a controlled environment where ionic current blockage patterns are clearly defined, improving measurement precision for adjacent base pairs while the confined geometry suppresses noise from external factors.
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
Enables ultra-fast, real-time, and label-free analysis of single DNA strands with improved resolution, capable of distinguishing individual DNA bases and suppressing noise, potentially leading to advanced DNA sequencing technologies.
Implementation Method 1
passing the sample through at least one nanogap within the nanofluidic channel
Implementation Method 2
measuring the ionic current through the nanopore caused by the blockage of DNA
Implementation Method 3
poor confinement of the DNA strand within the nanopore
Data Source
AI summary
The present invention provides methods and apparatus that can manipulate, detect, and/or analyze single molecules, single small particles or single small samples of matter passing through a nanoscale gap within a nanofluidic channel of a detector.