LSPR Immunosensor Using MoS2 Transistor for Rapid Cytokine Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for cytokine detection in human serum are limited by their complexity, time-consuming processes, and inability to provide real-time, sensitive, and accurate analysis of multiple cytokines, which is crucial for monitoring immune status in inflammatory diseases.
Innovation Solution
A localized surface plasmon resonance (LSPR) device comprising a nanoplasmonic filter with gold nanoparticles or gold rods and a few-layer MoS2 thin-film transistor, separated by a 100-300 µm deep air space, for label-free detection of cytokines, enabling rapid and sensitive analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fluorescence sandwich immunoassays are used for cytokine detection, then detection sensitivity can be achieved, but the assay process becomes time-consuming and complex due to multiple labeling and washing steps
Solution Approach 1:
The invention extracts and eliminates the fluorescent labeling step from the immunoassay process. By using label-free localized surface plasmon resonance (LSPR) detection, the method removes the time-consuming labeling and washing steps while maintaining detection capability through direct measurement of refractive index changes at the sensor surface.
Solution Approach 2:
The invention replaces the optical fluorescence detection system with a plasmonic field-based detection system. The LSPR sensor uses localized surface plasmon resonance to detect analyte binding through refractive index changes, substituting the mechanical/chemical labeling process with a direct physical field interaction that eliminates multiple washing steps.
2Measurement precision
If conventional fluorescence sandwich immunoassays are used for cytokine detection, then detection can be performed, but the process requires multiple washing steps increasing operational complexity
Solution Approach 1:
The invention extracts and removes the fluorescent label component from the detection system. By implementing label-free LSPR detection, it eliminates the need for washing steps required to remove unbound labels, thereby simplifying the overall assay protocol while preserving detection accuracy through direct binding measurement.
Solution Approach 2:
The LSPR sensor surface performs self-detection by directly measuring refractive index changes caused by analyte binding. This self-service mechanism eliminates the need for external labeling reagents and multiple washing operations, reducing operational complexity while maintaining measurement precision.
3Measurement precision
If conventional immunoassays are used for immune monitoring, then cytokine detection is possible, but large sample volumes are consumed
Solution Approach 1:
The LSPR sensor utilizes a high-surface-area nanoplasmonic structure that acts as a highly efficient capture platform. This porous/nanstructured surface allows for enhanced analyte capture efficiency, enabling sensitive cytokine detection in smaller sample volumes by maximizing the interaction surface area within a compact footprint.
4Productivity
If real-time immune status monitoring is implemented, then rapid analysis of multiple cytokines is needed, but conventional methods cannot provide near-real-time results
Solution Approach 1:
The LSPR sensor enables continuous real-time monitoring of cytokine binding events as they occur. The plasmonic field continuously interacts with analytes in the sample stream, providing uninterrupted detection signals that allow for rapid analysis of multiple cytokines without the need for discrete washing and reading steps, thereby achieving near-real-time immune status monitoring.
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 device allows for continuous, label-free detection of cytokines with high sensitivity and speed, achieving detection limits as low as 250 fg/mL and completing assays in under 10 minutes, improving the monitoring of immune status in inflammatory diseases.
Implementation Method 1
a few-layer MoS2 thin-film transistor comprising a photoconductive flake comprising a few-layer MoS2 layer for detecting an LSPR resonance shift
Implementation Method 2
a nanoplasmonic filter comprising an array of gold nanorods (AuNRs)
Data Source
Figure 1ai~1c
Figure 2ai~2div
Figure 2e~2f
AI summary
Provided herein are systems and methods for performing assays. In particular, provided herein are systems and methods for performing sensitive and rapid immunoassays.