Magnetic Nanoaggregate-Embedded Bead for Bioparticle Detection
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Solution Overview
Problem
Conventional methods for detecting bioparticles like Salmonella and E. coli in food-borne diseases are time-consuming and cumbersome, requiring pre-enrichment steps and competing for binding sites with magnetic nanoparticles, which can lead to steric hindrance and decreased accuracy.
Innovation Solution
A magnetic nanoaggregate-embedded bead (NAEB) with a protective nanoshell, noble metal nanoparticles, and Raman reporter molecules, along with magnetic nanoparticles, is developed, allowing for fast separation and enrichment of bioparticles using a magnetic component and subsequent SERS detection without additional separation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (ELISA or PCR) are used to detect bioparticles, then detection can be performed, but the process requires pre-enrichment steps and is time-consuming and cumbersome
Solution Approach 1:
The patent combines magnetic separation functionality and SERS detection capability into a single integrated magnetic NAEB platform. The magnetic nanoparticles enable direct separation of bioparticles without pre-enrichment, while the embedded Raman reporter molecules provide immediate spectral detection, eliminating the multi-step conventional workflow and reducing detection time significantly
2Ease of operation
If magnetic nanoparticles are added for separation, then bioparticles can be separated, but additional separation steps are required making procedures more cumbersome
Solution Approach 1:
The magnetic nanoparticles, Raman reporter molecules, and targeting antibodies are integrated into a single magnetic NAEB entity. This unified structure performs both magnetic separation and SERS detection in one step, eliminating the need for separate addition of magnetic nanoparticles and subsequent separation procedures, thereby simplifying the overall workflow
3Measurement precision
If antibody molecules on NAEB Raman tag and magnetic nanoparticles compete for binding sites, then binding sites may be blocked, but steric hindrance occurs and available binding sites decrease
Solution Approach 1:
The targeting antibodies are conjugated directly to the magnetic NAEB surface, creating a unified binding interface. This eliminates the competitive binding scenario between separate antibody molecules on NAEB and magnetic nanoparticles, as there is now only one antibody layer on the magnetic NAEB structure, removing steric hindrance issues
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 magnetic NAEB method reduces detection time, omits cumbersome steps, and enhances accuracy by enabling unique identification and quantitative analysis of bioparticles with targeted molecules, while maintaining biostability and biocompatibility.
Implementation Method 1
utilize a magnetic component to attract the bioparticles bound with the magnetic NAEBs and the unbound magnetic NAEBs
Implementation Method 2
When there are resonances between the excitation and scattered fields and surface plasmons, electromagnetic field enhancement at the nanoparticle surface occurs and leads to enhancement of the Raman scattering signal
Implementation Method 3
The adsorbed molecule at the surface of the metal nanoparticles is excited by a field generated by the incident light and the Raman scattering light
Implementation Method 4
The protective nanoshell is for example made of silica, polymer, or metal oxide such as titania and zirconia, and covers the noble metal nanoparticles, the Raman reporter molecules and the at least one magnetic nanoparticle
Data Source
AI summary
A magnetic nanoaggregate-embedded bead (NAEB), a manufacturing method thereof and a bioparticle detection method using the same are disclosed. The magnetic NAEB has a protective nanoshell, noble metal nanoparticles, Raman reporter molecules and at least one magnetic nanoparticle. The protective nanoshell covers the noble metal nanoparticles, the Raman reporter molecules and the at least one magnetic nanoparticle. The noble metal nanoparticles, the Raman reporter molecules and the at least one magnetic nanoparticle form a magnetic nanoaggregate. Preferably, a chemical modification is performed on the magnetic NAEB, such that at least one targeting molecule is formed on an outer wall of the protective nanoshell, wherein a type of the targeting molecule is corresponding to a type of the bioparticle to be detected.