Biofunctional Quantum Dots: Controlled Conjugation for Multiplexed Biosensors

Semiconductor quantum dots possess unique photophysical properties such as bright emission with narrow wavelength bandwidth and extremely broad and strong absorption. In combination with their size-dependent color tunability, quantum dots have been proposed as ideal candidates for multiplexed optical bioanalysis for more than a decade. However, the unavailability of stable, reproducible, biocompatible quantum dots with controlled and functional multiple biolabeling has restricted these nanocrystals to research applications. In this issue of ACS Nano, Jennings et al. demonstrate the versatile use of quantum dot antibody conjugates produced by commercially available kits that allow an easy and fast labeling. This Perspective highlights the potential of novel quantum dot bioconjugation approaches in combination with state-of-the-art detection methods and technologies for successful and widely applicable multiplexed biosensing.