Researchers Use Fluorescent Carbon Nanotubes for Drug Delivery and Imaging
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By Cameron Chai

Single-walled carbon nanotubes were injected into a mouse by the team to watch the delivery of tubes through the bloodstream to internal organs. When the mouse was subjected to laser light, the nanotubes shone brightly responding to the laser. This image was recorded using a camera adjusted to near-infrared wavelengths of nanotubes. An anticancer drug can be attached to the nanotubes that enable the researchers to view the progression of the drug within the body of the mouse. The major advantage of nanotubes is that they fluoresce in a different range of near-infrared spectrum as compared to most dyes.

Any biological tissue naturally shines at wavelengths less than 900 nm, similar to existing biocompatible organic fluorescent dyes. This leads to unwanted background lighting which causes image smearing when dyes are injected. But, the nanotubes shine at wavelengths ranging between 1,000 and 1,400 nm Â. At these wavelengths there is negligible natural tis…………… continues on
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