Metal Nanoshell-Coated Barcodes for Fluorescence Stability

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Solution Overview

Problem

Current quantum dot (QD) barcodes face challenges with stability and conjugation ease, particularly in varying temperatures and assay environments, leading to potential misidentification due to fluorescence changes, limiting their broader utility in multiplex detection systems.

Innovation Solution

The development of metal nanoshell-coated microbeads with fluorophores, where a metal nanoshell is grown on the surface of polymeric microbeads using metal nanoparticles and a salt, enhancing shelf-life and fluorescence stability, and allowing for easier conjugation of target-specific capture probes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If quantum dot barcodes are used for multiplex detection, then detection capacity and throughput are improved, but fluorescence stability and shelf-life deteriorate under varying temperatures and assay environments

Engineering Contradiction:

Improvedetection capacityVSAvoidfluorescence stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a core-shell structure where quantum dots are embedded within a polymeric microbead core, which is subsequently coated with a metal nanoshell. This nested configuration protects the quantum dots from environmental factors while maintaining their fluorescence properties, resolving the contradiction between detection capacity and fluorescence stability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent creates a composite microbead system combining polymeric materials (for structural integrity and environmental isolation) with metal nanoshells (for enhanced stability and conjugation). This composite structure simultaneously achieves fluorescence stability and maintains the multiplex detection capabilities of the quantum dots.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If quantum dot barcodes are engineered with multiple colors and intensity levels, then multiplex detection capability is improved, but conjugation ease and shelf-life deteriorate

Engineering Contradiction:

Improvemultiplex detection capabilityVSAvoidconjugation ease

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The metal nanoshell coating provides a universal surface that can be functionalized with capture probes for different targets. This single coating layer enables the same microbead platform to be used for multiple conjugation applications, simplifying the manufacturing process while maintaining versatile multiplex detection capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If quantum dot barcodes are used in varying environmental conditions, then application versatility is improved, but fluorescence consistency deteriorates leading to misidentification

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidfluorescence consistency

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent employs a flexible polymeric microbead shell that encloses the quantum dots, providing physical protection against environmental variations. This shell maintains fluorescence consistency across different temperatures and buffers while allowing the system to adapt to various assay conditions.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent converts the potential harm of quantum dot environmental sensitivity into a benefit by using the polymeric shell to create a controlled microenvironment. This shell acts as a protective barrier that isolates the quantum dots from harmful environmental factors while maintaining their fluorescence properties for consistent detection.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Reliability

If metal nanoshell is grown on microbead surface, then shelf-life and fluorescence stability are improved, but manufacturing complexity increases

Engineering Contradiction:

Improveshelf-lifeVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent performs preliminary functionalization of the microbead surface with capture probes before growing the metal nanoshell. This preliminary action ensures that the probes are properly positioned and oriented, simplifying the subsequent nanoshell growth process and reducing overall manufacturing complexity while achieving enhanced shelf-life.

Inventive Principle:

Principle #10Preliminary action

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 metal nanoshell-coated barcodes demonstrate improved stability and analytical sensitivity, maintaining fluorescence consistency across different environmental conditions and enabling efficient multiplex detection with enhanced conjugation capabilities.

Implementation Method 1

a metal nanoshell is grown on the surface of polymeric microbeads using metal nanoparticles and a salt

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Implementation Method 2

QDs sheltered deep inside a polystyrene bead would protect the QDs from interacting with the aqueous environment

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 3

The barcode of the present invention includes a metal nanoshell-coated microbead having one or more populations of fluorophores

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS11473152B2Metal nanoshell-coated barcodes

Publication Date: 2022.10.18 THE GOVERNING COUNCIL OF THE UNIV OF TORONTO

AI summary

The present invention relates to barcodes coated with metal nanoshells and to methods of making the metal nanoshell-coated barcodes. The metal nanoshell-coated barcodes of the present invention have applications in detection systems, including multiplex detection systems.