Acrylamide Polymer Brush Coatings for Flow Cell Signal Stability
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Solution Overview
Problem
In sequencing by synthesis systems, the depletion of polymer coatings during extensive PCR cycles leads to progressive loss of signal, especially under high pH and elevated temperature conditions, affecting the stability and integrity of nucleic acid molecules attached to glass flow cell channels.
Innovation Solution
The development of robust polymer coatings using surface-initiated polymerization, incorporating biomolecules such as oligonucleotides, proteins, and antibodies, which remain intact and coupled to the surface after multiple PCR cycles, utilizing acrylamide-based polymer brushes and controlled radical polymerization techniques like ATRP and RAFT to ensure durability and retention of biomolecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passively bound polymer coating is used on glass flow cell channels, then the coating can be applied easily, but the polymer chains become depleted during extensive PCR cycles causing progressive loss of signal
Solution Approach 1:
The patent applies preliminary action by pre-coating the flow cell channels with a robust polymer layer using surface-initiated polymerization before performing PCR cycles. This pre-established coating provides a stable foundation that prevents polymer depletion during subsequent extensive cycling, maintaining signal integrity throughout the sequencing process.
Solution Approach 2:
The patent employs composite materials by creating a polymer coating that incorporates both the base polymer matrix and embedded biomolecules (such as nucleic acid molecules). This composite structure provides enhanced stability and durability compared to simple passive coatings, allowing the coating to withstand extensive PCR cycling while maintaining functionality.
2Productivity
If high pH and elevated temperature conditions are employed during PCR, then the denaturation and extension steps are more effective, but the polymer coating and nucleic acid molecules become depleted faster
Solution Approach 1:
The patent applies parameter changes by modifying the polymer coating's chemical composition and cross-linking density to withstand high pH and temperature conditions. The surface-initiated polymerization creates a coating with enhanced thermal and chemical stability, allowing it to maintain integrity during aggressive PCR conditions that would otherwise cause rapid depletion of weaker coatings.
Solution Approach 2:
The patent implements beforehand cushioning by creating a robust, cross-linked polymer coating that serves as a protective cushion for the embedded nucleic acid molecules during harsh PCR conditions. This pre-established protective layer absorbs the stress of high temperature and pH fluctuations, preventing direct damage to the biomolecules and maintaining coating integrity throughout the cycling process.
3Quantity of substance
If extensive cycles of sequencing by synthesis are performed, then more sequence data is obtained, but the polymer coating becomes depleted leading to progressive loss of signal
Solution Approach 1:
The patent applies continuity of useful action by creating a durable polymer coating that maintains its integrity and signaling capability throughout extensive sequencing cycles. The surface-initiated polymerization produces a continuous, stable coating that prevents the progressive depletion seen in passive coatings, allowing uninterrupted signal detection across hundreds of cycling cycles without loss of functionality.
Solution Approach 2:
The patent uses preliminary action by pre-establishing a robust polymer coating structure before sequencing begins. This pre-formed coating provides a stable platform that sustains signal integrity throughout the entire sequencing process, enabling continuous data acquisition without the signal loss that would otherwise occur during extensive cycling.
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 polymer coatings maintain at least 90% integrity and retention of biomolecules after 30-40 cycles of PCR or sequencing by synthesis reactions, providing a stable environment for enzymatic reactions and improving the durability and thermal stability of the surface-bound molecules.
Implementation Method 1
conducting surface initiated polymerization of a polymer from the initiator species, thereby producing a polymer coating comprising a plurality of polymer chains
Implementation Method 2
the polymer brush comprises acrylamide... at least 90% of the nucleic acid molecules remain intact and coupled to the surface after at least 30 PCR cycles, wherein each PCR cycle comprises the following reaction conditions: (a) a denaturation step at a temperature of at least 85° C.
Implementation Method 3
covalently bonding initiator species to the surface... controlled radical polymerization techniques like ATRP and RAFT to ensure durability and retention of biomolecules
Data Source
AI summary
Provided herein are methods and compositions for coating surfaces with polymers. The methods and compositions are suited for conducting biological reactions.