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π-Conjugated Chromophore Incorporated Polystyrene Nanobeads as Single Optical Agent for Three-Channel Fluorescent
Sarabjot Kaur Makkad1,2, S K Asha1,2
1Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.
ACS Biomaterials Science & Engineering
|January 12, 2021
Summary
Researchers developed fluorescent polystyrene nanobeads for multicolor bioimaging. These biocompatible nanobeads show high fluorescence and can be tracked within cells, offering a versatile tool for advanced imaging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Biotechnology
Background:
- Developing advanced fluorescent probes is crucial for high-resolution bioimaging.
- Existing probes often lack multicolor capabilities or sufficient biocompatibility.
Purpose of the Study:
- To synthesize and characterize novel fluorescent polystyrene (PS) nanobeads for multicolor bioimaging.
- To evaluate the biocompatibility and cellular uptake of these nanobeads for potential applications in cell tracking and subcellular localization.
Main Methods:
- Miniemulsion polymerization technique to incorporate perylene bisimide (PBI) and oligo(p-phenylenevinylene) (OPV) dyes into PS nanobeads.
- Characterization using FESEM, TEM, and DLS for size, morphology, and surface charge.
- In vitro studies with HeLa cells, including cell viability assays, flow cytometry, and confocal laser scanning microscopy (CLSM).
Main Results:
- Successfully synthesized PS nanobeads (70-120 nm) with high fluorescence emission (OPV-PS: 400-550 nm; PBI-PS: 520-650 nm).
- OPV(PBI)-PS nanobeads demonstrated multicolor emission capabilities (350-490 nm excitation).
- Nanobeads showed excellent biocompatibility (>90% cell viability) and efficient cellular uptake, confirmed by CLSM and flow cytometry.
- Precise subcellular localization in the cytoplasm was achieved due to multicolor emission.
Conclusions:
- The developed PS nanobeads serve as a single optical agent with three-channel fluorescent probe capabilities.
- These nanobeads are advantageous for multicolor bioimaging, offering enhanced cellular tracking and subcellular localization.
- The study highlights the potential of these biocompatible nanobeads in advanced biomedical imaging.
