Novel polystyrene/antibody nanoparticle-coated capillary for immunoaffinity in-tube solid-phase microextraction
Bei Xu1, Shuai Cheng, Xianhua Wang
1Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin, 300070, China.
Analytical and Bioanalytical Chemistry
|February 22, 2015
Summary
Antibody-coated nanoparticles immobilized on a capillary enhance immunoaffinity solid-phase microextraction (SPME) for detecting β2-microglobin and cystatin C. This novel method significantly improves extraction capacity and sensitivity compared to traditional techniques.
Area of Science:
- Analytical Chemistry
- Biomaterials Science
- Nanotechnology
Background:
- Immunoaffinity solid-phase microextraction (SPME) is crucial for detecting biomarkers.
- Current methods using monolayer antibody immobilization have limitations in extraction capacity and sensitivity.
- Developing advanced materials for enhanced SPME performance is an ongoing research area.
Purpose of the Study:
- To develop and evaluate antibody-coated polystyrene (PS) nanoparticles immobilized on a capillary inner wall for immunoaffinity in-tube SPME.
- To compare the performance of this nanoparticle-functionalized capillary with a monolayer antibody-immobilized capillary for the extraction of β2-microglobin (β2MG) and cystatin C (Cys-C).
Main Methods:
- Preparation and chemical immobilization of antibody-coated polystyrene (PS) nanoparticles (PS/IgG) onto a capillary inner wall.
- Characterization of the nanoparticle-coated surface using scanning electron microscopy (SEM).
- Immunoaffinity in-tube SPME of β2MG and Cys-C using the functionalized capillary.
Main Results:
- Nanoparticles were evenly coated on the capillary inner surface, creating an undulating topography.
- The nanoparticle-coated capillary exhibited nearly five times higher extraction capacity than a monolayer antibody-immobilized capillary.
- SPME recovery for β2MG (or Cys-C) exceeded 97.8% with the nanoparticle-coated capillary, compared to 30.5% for the monolayer.
- The method quantitation limit was ten times lower using the nanoparticle-coated capillary.
Conclusions:
- The PS/IgG nanoparticle-coated capillary offers significantly improved performance for immunoaffinity in-tube SPME.
- This novel approach is more suitable for the sensitive and efficient extraction of β2MG and Cys-C than conventional monolayer antibody immobilization.
- The findings highlight the potential of nanoparticle-based materials for advanced analytical applications.
