Upconversion Nanoprobe Microarray for Virus Detection
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Solution Overview
Problem
Current DNA oligonucleotide detection methods, such as RT-PCR and ELISA, are time-consuming, prone to contamination, and have low sensitivity, while existing luminescent assays using downconversion mechanisms face issues with photodamage and false-positive signals due to the use of high-energy UV light sources.
Innovation Solution
A microarray design utilizing acid-modified core-shell upconversion nanoparticles (UCNPs) on a nanoporous anodized alumina membrane for simultaneous detection of multiple oligonucleotides, employing a hybrid UCL assay with NIR excitation to minimize photodamage and enhance sensitivity, allowing for rapid and sensitive detection of various viruses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downconversion luminescence-based assays are used for rapid detection, then detection speed is improved, but photodamage to DNA and chemical oligo chain backbones occurs due to UV light exposure
Solution Approach 1:
The patent changes the excitation wavelength parameter from UV (high energy) to NIR (low energy, 700-1000 nm). This parameter change enables upconversion luminescence which eliminates photodamage to DNA and chemical oligo chain backbones while maintaining rapid detection capability. The excitation source is changed from UV light to infrared laser, fundamentally altering the energy interaction with biological samples.
2Productivity
If downconversion luminescence-based assays are used, then detection speed is improved, but false-positive detection signals occur due to UV-induced autofluorescence
Solution Approach 1:
The patent changes the excitation wavelength from UV to NIR range (700-1000 nm), which eliminates UV-induced autofluorescence that causes false-positive signals. The upconversion luminescence mechanism with large anti-Stokes shift allows clear distinction between excitation and emission wavelengths, significantly improving detection reliability and reducing false positives while maintaining rapid detection speed.
3Measurement precision
If RT-PCR technique is used for DNA oligonucleotide detection, then detection sensitivity is improved, but detection time increases to 1-3 days
Solution Approach 1:
The patent replaces the complex thermal cycling mechanical system of RT-PCR with a direct luminescence detection system. Instead of using thermocyclers for repeated heating and cooling cycles, the invention uses upconversion luminescence with infrared laser excitation to directly detect oligonucleotides through hybridization, eliminating the time-consuming amplification steps while maintaining high detection sensitivity.
4Ease of operation
If ELISA technique is used for oligonucleotide detection, then procedural simplicity is improved, but detection sensitivity decreases to nanomolar range
Solution Approach 1:
The patent uses composite upconversion nanoparticle structures with core-shell configuration (e.g., NaGdF4:Yb/Er@NaGdF4:Yb/Nd) that combine multiple functional materials. These composite nanoparticles provide enhanced luminescence properties, improved stability, and tunable emission wavelengths, achieving femtomolar detection sensitivity while maintaining procedural simplicity through direct luminescence readout without complex enzyme reactions.
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 microarray design achieves rapid detection of multiple virus genes within 0.5-5 hours with a limit of detection at the femtomolar range, reducing photodamage and autofluorescence, and is more cost-effective and user-friendly compared to conventional PCR methods, suitable for on-site diagnostics.
Implementation Method 1
upconversion luminescence (UCL) assays are developed to overcome the above-mentioned drawbacks. UCL is a unique luminescent phenomenon that involves sequential absorption of lower energy photons to emit a higher energy photon
Implementation Method 2
A nanoporous anodized alumina membrane is incubated with 10 µL of amine-functionalized PAA-csUCNPs (200 µg/mL)
Implementation Method 3
The techniques are essential for identifying virus genes in one sample. Firstly, the RT-PCR technique is a genetic diagnostic technique based on cloning expressed genes by reverse transcribing the RNA of virus into its DNA complement and amplification of the complement DNA (c-DNA) via thereto-cycling in a thermos cycler. This technology involves the sophistically-designed primers for efficient amplification via nucleic acid hybridization.
Data Source
AI summary
The invention relates to a microarray design of hybrid upconversion nanoparticles on a nanoporous anodized alumina membrane heterogeneous assay for simultaneous detection of multiple oligonucleotides, for example, oligonucleotides from different types of viruses.