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Related Experiment Video

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Realization of high-performance biosensor through sandwich analysis utilizing weak value amplification.

Bei Wang1, Lizhong Zhang1, Gengyu Liang1

  • 1Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.

Talanta
|June 3, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a novel label-free optical biosensor using weak value amplification for sensitive detection of alpha-fetoprotein (AFP). The enhanced sensor offers a promising tool for early disease diagnosis and biomarker monitoring.

Keywords:
3D printed channelsBinding sequenceLabel-free sensorSandwich immunoassayWeak value amplification

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Optoelectronics

Background:

  • Sensitive detection of biomarkers like alpha-fetoprotein (AFP) is crucial for early disease diagnosis.
  • Existing biosensing methods often face limitations in sensitivity, selectivity, or require complex labeling procedures.
  • Label-free optical detection offers advantages in simplifying assay procedures and enabling real-time monitoring.

Purpose of the Study:

  • To develop a label-free optical sandwich immunoassay sensor with enhanced sensitivity and reliability.
  • To utilize weak value amplification (WVA) and total internal reflection (TIR) for high-performance biosensing.
  • To demonstrate the sensor's capability for detecting low-concentration biomarkers in complex biological samples.

Main Methods:

  • Fabrication of a label-free optical sandwich immunoassay sensor incorporating WVA and TIR principles.
  • Optimization of the sandwich assay structure, including antibody binding sequences, for enhanced responsiveness.
  • Utilizing 3D printed channels and sodium chloride solutions for reproducible and stable measurements.
  • Comparative analysis of direct and sandwich assay formats for alpha-fetoprotein (AFP) detection.

Main Results:

  • Achieved a low limit of detection (LOD) of 6.29 ng/mL (pM level) for AFP in PBS solution.
  • Demonstrated high sensitivity and enhanced responsiveness of the sandwich assay compared to the direct assay.
  • Successfully detected AFP in human serum, proving feasibility in complex samples and chip reusability.
  • Exhibited excellent selectivity for unpaired antigens and simultaneous detection of multiple biomarkers (AFP, CEA, CA15-3).

Conclusions:

  • The developed label-free optical sandwich immunoassay based on WVA is a highly sensitive and reliable biosensing platform.
  • This method shows significant potential for early disease diagnosis and prevention applications.
  • The sensor's simplicity, reusability, and ability to detect multiple biomarkers suggest easier promotion in practical applications compared to existing methods.