Plasma Polymerized Ethylenediamine Protein Chip Substrate

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Solution Overview

Problem

Conventional protein chips face issues with non-specific adsorption of proteins on the slide surface, which leads to false responses in diagnostic inspections, especially in regions without amine groups.

Innovation Solution

Plasma polymerized ethylenediamine (PPEDA) with an amine group is deposited on plasma polymerized cyclohexane (PPCHex) using inductively coupled plasma-chemical vapor deposition (ICP-CVD) to create a hydrophilic surface that minimizes non-specific adsorption, allowing for efficient and targeted protein immobilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional slide surfaces are used for protein immobilization, then the process is simple, but non-specific protein adsorption occurs causing false responses

Engineering Contradiction:

Improvediagnostic accuracyVSAvoidnon-specific adsorption

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary layer (PPEDA film with amine groups) between the slide surface and proteins. This intermediary layer specifically binds proteins through amine group interactions while preventing non-specific adsorption on the slide surface, thereby resolving the contradiction between simple processing and diagnostic accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical parameters of the slide surface by depositing a PPEDA film with specific amine group concentration and hydrophilicity. This parameter change transforms the surface properties to enable specific protein binding while preventing non-specific adsorption, improving reliability without complicating the overall process

Inventive Principle:

Principle #35Parameter changes

2Reliability

If plasma polymerized ethylenediamine (PPEDA) is deposited on plasma polymerized cyclohexane (PPCHex), then non-specific adsorption is prevented, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvespecificity of protein bindingVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by first depositing the PPCHex layer to create a hydrophobic base layer that prevents non-specific adsorption, then subsequently depositing the PPEDA layer with amine groups for specific protein binding. This sequential preliminary preparation resolves the contradiction by establishing a foundation that simplifies subsequent protein immobilization

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses composite materials by combining PPCHex (hydrophobic, non-adsorbing) and PPEDA (hydrophilic, amine-containing) layers. This composite structure leverages the complementary properties of both materials to achieve specific protein binding while preventing non-specific adsorption, justifying the added manufacturing complexity through superior performance

Inventive Principle:

Principle #40Composite materials

3Productivity

If the slide surface is made hydrophilic to improve protein immobilization, then protein binding efficiency increases, but non-specific adsorption may increase

Engineering Contradiction:

Improveprotein immobilization efficiencyVSAvoidnon-specific adsorption

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different surface properties in different layers: the PPCHex base layer provides hydrophobicity to prevent non-specific adsorption, while the PPEDA top layer provides hydrophilicity and amine groups for specific protein binding. This localized differentiation of surface properties resolves the contradiction between immobilization efficiency and prevention of non-specific adsorption

Inventive Principle:

Principle #3Local quality

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 method effectively prevents non-specific protein binding, enabling precise immobilization of proteins on the hydrophilic PPEDA surface, improving the reliability of protein chip diagnostics and facilitating mass production.

Implementation Method 1

plasma polymerized ethylenediamine (PPEDA) having an amine group is deposited on plasma polymerized cyclohexnane (PPCHex)

Methodology Applied

Scientific EffectPlasma polymerization: Plasma

Implementation Method 2

by inductively coupled plasma-chemical vapor deposition (ICP-CVD)

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS7785649B2Method for manufacturing protein chip substrate using plasma and protein chip substrate manufactured by the method

Publication Date: 2010.08.31 RES & BUSINESS FOUND SUNGKYUNKWAN UNIV

AI summary

Disclosed herein are a protein chip substrate and a method for manufacturing the protein chip substrate. The method includes deposition of plasma polymerized ethylenediamine (PPEDA) having an amine group on plasma polymerized cyclohexnane (PPCHex) by inductively coupled plasma-chemical vapor deposition (ICP-CVD), thereby preventing non-specific adsorption of proteins on a slide surface.