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Novel Electron Donor Encapsulation Assay Based on the Split-type Photoelectrochemical Interface.

Rui Xu¹, Lei Liu¹, Xuejing Liu¹

¹Collaborative Innovation Center for Green Chemical Manufacturing and Accurate Detection, Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , Shandong , China.

ACS Applied Materials & Interfaces

|January 22, 2020

Summary

A novel controlled-release photoelectrochemical (PEC) immunosensor uses semiconductor encapsulation for sensitive procalcitonin detection. This innovative system offers a new approach for detecting various biomarkers.

Keywords:

CdS@MSN-AA In2O3 controlled release photoelectrochemical sensor split-type

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Area of Science:

Materials Science
Analytical Chemistry
Biomedical Engineering

Background:

Photoelectrochemical (PEC) immunosensors offer sensitive detection but often face challenges with signal amplification and controlled release of signal molecules.
Existing methods for electron donor release in PEC sensors may involve enzymes or harsh chemical conditions, limiting their applicability.
Developing novel encapsulation strategies is crucial for enhancing the performance and stability of PEC immunosensors.

Purpose of the Study:

To propose a controlled-release photoelectrochemical (PEC) immunosensor based on a novel encapsulation strategy using all-inorganic semiconductor materials.
To develop a system for controlled release of a PEC electron donor without enzymes or harsh chemicals.
To demonstrate the sensor's capability for detecting procalcitonin (PCT) as a model analyte.

Main Methods:

Fabrication of a controlled-release system using group-functional mesoporous silica nanospheres (MSN) encapsulated with ascorbic acid (AA) and capped with cadmium sulfide (CdS) nanoparticles (CdS@MSN-AA).
Utilizing Bi2S3-sensitized porous In2O3 nanoparticles as the substrate matrix for enhanced PEC response.
Implementing a split-type framework in a 96-well plate to eliminate interference between biorecognition and PEC analysis.

Main Results:

The developed CdS@MSN-AA complex served as an effective signal amplifier labeled on the secondary antibody.
The sensor demonstrated a linear detection range for procalcitonin (PCT) from 0.001-200 ng/mL.
Achieved a low limit of detection of 0.31 pg/mL for PCT, indicating high sensitivity.

Conclusions:

The novel encapsulation strategy provides an effective method for controlled release of electron donors in PEC immunosensors.
The developed PEC immunosensor exhibits high sensitivity and selectivity, suitable for detecting biomarkers like PCT.
This strategy offers a promising and innovative approach for the development of advanced biosensors for various applications.