Versatile Prepolymer Platform for Controlled Tailoring of Quantum Dot Surface Properties.

JuYeon Lee, Giselle Soares, Calvin Doty, Joonhyuck Park, Jack Hovey, Alex Schrader, Hee-Sun Han

ACS applied materials & interfaces 2024 Mar 27

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Quantum dots (QDs) hold immense promise for bioimaging, yet technical challenges in surface engineering limit their wider scientific use. We introduce poly(pentafluorophenyl acrylate) (PPFPA) as a user-friendly prepolymer platform for creating precisely controlled multidentate polymeric ligands for QD surface engineering, accessible to researchers without extensive synthetic expertise. PPFPA combines the benefits of both bottom-up and prepolymer approaches, offering minimal susceptibility to hydrolysis and side reactions for controlled chemical composition, along with simple synthetic procedures using commercially available reagents. Live cell imaging experiments highlighted a significant reduction in nonspecific binding when employing PPFPA, owing to its minimal hydrolysis, in contrast to ligands synthesized by using a conventional prepolymer prone to uncontrolled hydrolysis. This observation underscores the distinct advantage of our prepolymer system. Leveraging PPFPA, we synthesized biomolecule-conjugated QDs and performed QD-based immunofluorescence to detect a cytosolic protein. To effectively label cytosolic targets in such a dense and complex environment, probes must exhibit minimal nonspecific binding and be compact. As a result, QD-immunofluorescence has focused primarily on cell surface targets. By creating compact QD-F(ab')2, we sensitively detected alpha-tubulin with a ∼50-fold higher signal-to-noise ratio compared to organic dye-based labeling. PPFPA represents a versatile and accessible platform for tailoring QD surfaces, offering a pathway to realize the full potential of colloidal QDs in various scientific applications.

Citation

JuYeon Lee, Giselle Soares, Calvin Doty, Joonhyuck Park, Jack Hovey, Alex Schrader, Hee-Sun Han. Versatile Prepolymer Platform for Controlled Tailoring of Quantum Dot Surface Properties. ACS applied materials & interfaces. 2024 Mar 27;16(12):15202-15214