Flow Cell Copolymer Coating for Stable Primer Attachment
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Solution Overview
Problem
Existing flow cells face challenges in efficiently attaching nucleic acid strands to polymer or hydrogel-coated surfaces for molecular analyses, such as nucleic acid sequencing, due to limitations in attachment mechanisms and stability of the copolymer coatings.
Innovation Solution
A copolymer coating with alkoxyamine end groups is introduced, which provides additional attachment sites and enhances stability by reacting with norbornene silane molecules on the substrate, allowing for improved attachment and increased primer availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polymer or hydrogel coatings are used on flow cell substrates, then the coating can be applied to the substrate surface, but the attachment stability and durability of the coating over time is insufficient
Solution Approach 1:
The patent employs a composite copolymer system consisting of norbornene-functionalized acrylamide units and acrylamide units, where the norbornene groups enable covalent crosslinking with silane-coated substrates. This composite structure combines the adhesive properties of norbornene-silane interaction with the functional properties of acrylamide, creating a durable and stable coating that maintains attachment over extended periods.
Solution Approach 2:
The patent modifies the chemical parameters of traditional polymer coatings by incorporating norbornene functional groups into the acrylamide polymer structure. This parameter change enables the polymer to undergo covalent bonding reactions with silane-treated substrate surfaces, fundamentally improving attachment stability and long-term durability compared to physical adsorption alone.
2Reliability
If additional attachment sites are introduced to enhance coating stability, then the coating durability improves, but the device complexity increases
Solution Approach 1:
The copolymer is segmented into distinct functional units: norbornene-functionalized acrylamide units that provide attachment capability to the substrate, and regular acrylamide units that provide hydrogel functionality. This segmentation allows each component to perform its specific function efficiently while maintaining overall system simplicity.
Solution Approach 2:
The norbornene-acrylamide copolymer serves multiple functions simultaneously: it adheres to the silane-coated substrate through norbornene-silane covalent bonding, provides hydrogel matrix for nucleic acid immobilization, and maintains biocompatibility. This multi-functionality reduces the need for separate layers or components, thereby limiting complexity increase.
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 alkoxyamine end groups in the copolymer coating ensure stable and efficient attachment to the substrate, increasing the number of primers on the surface and improving sequencing metrics by maintaining activity even after storage for at least 6 months.
Implementation Method 1
The alkoxyamine group(s) provide the copolymer coating with additional attachment site(s) to a flow cell surface... at least some of the copolymer chains include at least one alkoxyamine end group... reacting with norbornene silane molecules on the substrate
Data Source
AI summary
A flow cell includes a substrate and a copolymer coating. The copolymer coating includes copolymer chains, each having recurring units of formula (I): and formula (II):. In formula (I), R1 is —H, a halogen, an alkyl, an alkoxy, an alkenyl, an alkynyl, a cycloalkyl, an aryl, a heteroaryl, a heterocycle, or optionally substituted variants thereof; R2 is an azido; each (CH2)p can be optionally substituted; and p is an integer from 1 to 50. In formula (II), each of R3, R3′, R4, R4′ is —H, R5, —OR5, —C(O)OR5, —C(O)R5, —OC(O)R5, —C(O)NR6R7, or —NR6R7; R5 is —H, —OH, an alkyl, a cycloalkyl, a hydroxyalkyl, an aryl, a heteroaryl, a heterocycle, or optionally substituted variants thereof; and each of R6 and R7 is —H or an alkyl. Some copolymer chains include at least one alkoxyamine end group.