Plasma-Treated Polymeric Surface for Reduced Biomolecule Adhesion
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Solution Overview
Problem
Existing plastic laboratory ware surfaces, such as microwell plates and pipettes, tend to adsorb biomolecules like proteins, DNA, and RNA due to their hydrophobic nature, which interferes with biological testing and can lead to contamination issues.
Innovation Solution
The use of covalently bound polymeric zwitterionic monolayers or epoxy-modified zwitterion-containing copolymeric monolayers on plastic surfaces, achieved through plasma treatment with non-polymerizing compounds, to reduce biomolecule adsorption and prevent polymer dissolution into fluid media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic ware surfaces are used for laboratory applications, then cost and durability are improved, but biomolecule adsorption increases
Solution Approach 1:
A zwitterionic polymer coating is applied as an intermediary layer between the plastic surface and biomolecules. This coating layer prevents direct interaction between the hydrophobic plastic surface and biomolecules, thereby eliminating adsorption while maintaining the underlying plastic material's properties
Solution Approach 2:
The surface properties of the plastic are changed by modifying its chemical composition through plasma treatment. The treatment introduces zwitterionic functional groups that alter the surface's interaction characteristics with biomolecules, transforming it from adsorption-prone to adsorption-resistant
2Reliability
If conventional plasma treatment is applied to plastic surfaces, then surface reactivity is improved, but polymer dissolution occurs
Solution Approach 1:
The plasma treatment parameters are optimized to achieve surface modification without excessive energy input. By controlling plasma power, treatment duration, and gas composition, the surface is activated to appropriate levels of reactivity while preventing bulk polymer degradation and dissolution
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 surface modifications significantly inhibit non-specific biomolecule adsorption and binding, maintaining the integrity of biological samples and reducing contamination risks in laboratory settings.
Implementation Method 1
the invention relates to plasma treatment or surface modification of a plastic substrate, e.g., a medical device or item of laboratory ware, using non-polymerizing compounds to reduce protein adhesion to the substrate surface
Data Source
AI summary
A substrate is described having a treated contact surface comprising a carbon or silicon compound comprising from 1 to 30 atomic percent oxygen, from 0.1 to 30 atomic percent nitrogen, or both, each as measured by XPS. A method is also provided for treating a surface of a substrate. The method includes treating the surface with plasma comprising one or more non-polymerizing compounds. The treated contact surface has a biomolecule recovery percentage greater than the biomolecule recovery percentage of the surface prior to treatment according to the method.