Quantum dot incorporated Bacillus spore as nanosensor for viral infection

Area of Science:

• Biotechnology
• Materials Science
• Nanotechnology

Background:

• Developing efficient and eco-friendly platforms for high-throughput biological detection is crucial.
• Quantum dots (QDs) offer unique optical properties for biosensing applications.
• Spore-based materials present biocompatible and functionalizable platforms for nanotechnology.

Purpose of the Study:

• To develop a high-throughput biological method for preparing spore-based monodisperse microparticles (SMMs).
• To create nanocomposites of cadmium telluride (CdTe) quantum dot (QD)-loaded SMMs (QDSMs).
• To evaluate the potential of QDSMs in high-throughput immunoassays for disease detection.

Main Methods:

• Utilized Bacillus spores' endogenous functional groups to load CdTe QDs onto SMMs.
• Characterized SMMs and QDSMs using various microscopy and spectroscopy techniques (TEM, HRTEM, fluorescence, UV-Vis, FTIR, XPS).
• Investigated QD/SMM and antigen/QDSM interactions using isothermal titration microcalorimetry (ITC).

Main Results:

• Successfully prepared fluorescent QDSMs with single or multiple colors and controlled emission intensity ratios.
• Demonstrated the utility of green QDSMs for detecting porcine parvovirus antibody in swine sera using flow cytometry.
• Established the thermodynamic principles governing QD/SMM and antigen/QDSM interactions.

Conclusions:

• The developed QD-loaded SMM platform is simple, low-cost, high-throughput, and eco-friendly.
• QDSMs exhibit significant potential for applications in high-throughput immunoassays.
• This platform can be widely applied in disease detection, food safety evaluation, and environmental assessment.