Assembling of a functional cyclodextrin-decorated upconversion luminescence nanoplatform for cysteine-sensing

Area of Science:

• Nanotechnology
• Biochemistry
• Analytical Chemistry

Background:

• Upconversion nanoparticles (UCNPs) offer unique optical properties for sensing applications.
• Cysteine (Cys) is a crucial biomolecule involved in various biological processes.
• Developing selective and sensitive detection methods for Cys in aqueous environments is important.

Purpose of the Study:

• To develop a novel rhodamine-oxaldehyde (RHO) functionalized β-NaYF4:Yb(3+)/Er(3+) upconversion nanoparticle (UCNP) system.
• To achieve specific detection of cysteine (Cys) in aqueous solution using a Förster resonance energy transfer (FRET) process.
• To enhance the water dispersibility of hydrophobic UCNPs for practical applications.

Main Methods:

• Functionalization of β-NaYF4:Yb(3+)/Er(3+) UCNPs with rhodamine-oxaldehyde (RHO).
• Utilizing a Förster resonance energy transfer (FRET) mechanism for signal transduction upon Cys binding.
• Employing α-cyclodextrin to modify hydrophobic UCNPs for improved water dispersibility via self-assembly.

Main Results:

• The RHO-functionalized UCNPs demonstrated specific detection of cysteine.
• The FRET process enabled sensitive detection of cysteine in aqueous solutions.
• Modification with α-cyclodextrin successfully rendered the UCNPs water-dispersible.

Conclusions:

• A novel RHO-functionalized UCNP probe was successfully developed for cysteine detection.
• The FRET-based sensing strategy provides a sensitive and specific method for Cys quantification.
• The water dispersibility enhancement using α-cyclodextrin broadens the applicability of UCNPs in biological and environmental analyses.