Metal Oxide Surface Modification for Nucleic Acid Sequencing
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Solution Overview
Problem
Current surface modification techniques for nucleic acid sequencing face challenges in minimizing non-specific adsorption of biomolecules, leading to false signals due to rare adsorption of labeled nucleotides on surfaces, necessitating improved control over surface activation chemistry and stability of bead attachment substrates.
Innovation Solution
A method involving the deposition of a metal oxide layer on a surface, followed by contacting a functionalized particle with phosphated or carboxylated moieties, and subsequent passivation with agents like poly(vinyl phosphoric acid) to immobilize beads, reducing non-specific binding and enhancing surface stability for nucleic acid sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface modification techniques are used for nucleic acid sequencing, then bead attachment can be achieved, but non-specific adsorption of biomolecules occurs leading to false signals
Solution Approach 1:
The patent introduces a metal oxide layer as an intermediary between the substrate and the bead attachment substrate. This intermediate layer provides controlled surface chemistry that enables specific bead attachment while minimizing non-specific adsorption of biomolecules, thereby resolving the contradiction between achieving reliable bead attachment and preventing false signals
Solution Approach 2:
The patent modifies surface parameters by depositing metal oxide layers with controlled thickness, composition, and surface chemistry. By adjusting these parameters, the surface exhibits optimized properties for bead attachment while reducing non-specific binding, thus improving signal accuracy without compromising bead attachment stability
2Reliability
If surface activation chemistry is not properly controlled, then bead attachment can be achieved, but surface stability is compromised leading to inconsistent results
Solution Approach 1:
The patent applies preliminary surface treatment steps including cleaning, plasma treatment, and metal oxide layer deposition before bead attachment. These preliminary actions prepare the surface with stable, controlled chemistry that ensures consistent and reliable bead attachment results, preventing instability during subsequent experiments
3Measurement precision
If non-specific adsorption is minimized, then false signals are reduced, but bead attachment may be compromised
Solution Approach 1:
The patent creates local quality differences on the surface by depositing metal oxide layers with specific chemical properties in certain regions. The surface exhibits different characteristics: areas with metal oxide groups for specific bead attachment and areas with passivated surfaces to prevent non-specific binding, thus achieving both detection accuracy and bead attachment reliability
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 effectively minimizes non-specific binding, allowing for reliable single-molecule detection and sequencing by creating a stable surface for immobilizing nucleic acid-laden beads, reducing false signals and improving the accuracy of nucleic acid sequencing processes.
Implementation Method 1
depositing a metal oxide layer onto the surface
Implementation Method 2
contacting a functionalized particle onto the metal oxide surface wherein the particle is immobilized on the surface
Implementation Method 3
passivation step including a passivating agent selected from the group consisting of poly(vinyl phosphoric acid), pyrophosphate, poly(acrylic acid)
Data Source
AI summary
Intermediates and methods for forming activated metal complexes bound to surfaces on oxide layers, immobilizing beads to the modified surface and articles produced thereby are described. Hydroxyl groups on the oxide surfaces are reacted with a metal reagent complex of the formula Y(L-Pol)m, where Y is a transition metal, magnesium or aluminum, L is oxygen, sulfur, selenium or an amine, and “Pol” represents a passivating agent such as a methoxyethanol, a polyethylene glycol, a hydrocarbon, or a fluorocarbon. The resulting modified surface can be further reacted with a passivating agent having a phosphate functional group or a plurality of functional groups that are reactive with or that form complexes with Y. The metal oxide surfaces exhibit minimal binding to bio-molecules, exhibit uniform deposition and immobilization of beads at high density, can be subsequently modified to create surfaces having a variety of properties, and can be used for nucleic acid sequencing and other analyses and in single-molecule detection schemes.