An immunoassay based on nanomotor-assisted electrochemical response for the detection of immunoglobulin
Enhui Ma1, Ke Wang1, Hong Wang2
1School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, People's Republic of China.
Insights
This study introduces a novel nanomotor-based immunoassay for sensitive immunoglobulin G (IgG) detection. Self-propelled nanomotors simplify the assay, enabling automated and miniaturized biosensing.
Area of Science:
- Nanotechnology
- Biosensing
- Electrochemistry
Background:
- Immunoassays are crucial for detecting biomarkers like immunoglobulin G (IgG).
- Traditional immunoassay development often involves complex self-assembly steps.
- There is a need for simplified, automated, and sensitive detection methods.
Purpose of the Study:
- To develop a simplified and sensitive immunoassay strategy for immunoglobulin G (IgG) detection.
- To utilize self-propelled nanomotors for automated immune-complex formation.
- To explore nanomotor-assisted electrochemical measurements for enhanced biosensing.
Main Methods:
- Development of Fe3O4@SiO2/Pt nanomotors as labels for primary antibodies (IgG).
- Utilized core-shell Au@Ag nanocubes as labels for secondary antibodies to amplify signals.
- Employed differential pulse voltammetry for electrochemical detection of the self-assembled sandwich immune-complex.
- Leveraged the autonomous movement of nanomotors for 'on-the-fly' binding and self-assembly.
Main Results:
- Successful development of a nanomotor-assisted immunoassay for IgG detection.
- Demonstrated automated self-assembly of sandwich immune-complexes via nanomotor propulsion.
- Achieved sensitive detection of IgG through electrochemical measurements.
- The nanomotor-label strategy obviated complex manual self-assembly procedures.
Conclusions:
- The developed strategy offers a simple, automated, and sensitive method for IgG detection.
- Self-propelled nanomotor-labels provide an effective approach for constructing immunosensors.
- This method holds promise for miniaturized and efficient immune-protein biosensing.
Abstract:
An immunoassay strategy has been developed based on nanomotor-assisted electrochemical measurements for simple and sensitive detection of immunoglobulin (IgG). The self-propelled Fe3O4@SiO2/Pt nanomotors were designed to label primary antibodies IgG (nanomotor-label) for the "on-the-fly" binding of the immune-protein. The core shell Au@Ag nanocubes (Au@Ag NCs) were used as labels of secondary antibodies (Au@Ag NCs-Ab2) to amplify electrochemical signal related to antigen concentration derived from the oxidation of Ag. The self-propelled nanomotors autonomously move in the solution to cruise and capture IgG and Au@Ag NCs-Ab2, resulting in the self-assembly of sandwich immune-complex. Finally, the immune-complex with magnetism can be transferred and modified on the electrode for the detection of IgG via differential pulse voltammetry. The self-propelled motion of the nanomotor-label obviates common procedures for the self-assembly of sandwich immunosensors to achieve satisfactory analysis results. With advantages of automation and miniaturization, the strategy based on self-propelled nanomotor-labels explores an effective method for the simple and sensitive detection of immune-protein in biosensing.
