ARE quantum dots safe to inject into humans? These fluorescent nanoparticles are being touted as a non-invasive way to make images of internal body tissues and diagnose disease. But a study has shown they could do more harm than good, by breaking down in the body and releasing cadmium, a toxic heavy metal.
Quantum dots consist of a core of fluorescent cadmium selenide or cadmium sulphide within an inert layer of zinc sulphide. They can be coated with a layer containing proteins or other molecules designed to latch onto specific biomolecules within the body. The hope is that when injected…
