Quantum Dot Biosensing for Enzyme Detection
Summary
Quantum dots (QDs) are semiconductor nanocrystals distinguished by size‐tunable emission, high photostability and broad absorption spectra. In enzyme detection, QD‐based biosensors harness these optical properties to transduce enzymatic activity into quantifiable fluorescence signals. Surface functionalisation with enzyme‐specific substrates or recognition motifs enables selective interaction, while Förster resonance energy transfer (FRET) and fluorescence quenching strategies deliver real‐time monitoring of catalytic events. The high quantum yield and narrow emission bandwidth of QDs facilitate low limits of detection and multiplexed assays, allowing simultaneous profiling of diverse enzyme classes such as proteases, kinases and hydrolases. Integration with microfluidic platforms and portable optics has extended applications to clinical diagnostics, environmental monitoring and point‐of‐care testing. Ongoing advances in non‐toxic QD materials and biocompatible coatings address concerns over cytotoxicity, broadening in vivo imaging and intracellular enzyme assays. Collectively, quantum dot biosensing represents a versatile and sensitive approach for probing enzyme kinetics, profiling disease biomarkers and developing next‐generation diagnostic tools.
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Quantum Dot Biosensing for Enzyme Detection publication trend
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Technical terms
Quantum dot: Semiconductor nanocrystal with size‐dependent optical emission properties.
Förster resonance energy transfer (FRET): Non‐radiative energy transfer between donor and acceptor fluorophores sensitive to intermolecular distance.
Limit of detection: Lowest concentration of analyte that produces a statistically significant signal above background.
Surface functionalisation: Chemical modification of QD surfaces to attach biomolecules or recognition elements.
Quantum yield: Ratio of emitted to absorbed photons, indicating fluorescence efficiency.
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