New genre of sugar-coated 'quantum dots' for drug delivery

March 4, 2009

(PhysOrg.com) -- Scientists in Switzerland are reporting an advance that could help tap the much-heralded potential of “quantum dots”— nanocrystals that glow when exposed to ultraviolet light — in the treatment of cancer and other diseases. They are publishing the first study showing that giving quantum dots an icing-like cap of certain sugars makes these nanoparticles accumulate in the liver but not other parts of the body.

That selective targeting could be used to deliver anti-cancer drugs to one organ, without causing the body-wide side-effects that occur with existing cancer drugs, they suggest. Their study is in the Feb. 18 issue of the Journal of the American Chemical Society.

In the new report, Peter H. Seeberger and colleagues note that quantum dots, about 1/5,000th the width of a human hair, are used in solar cells, medical diagnostic imaging, and electronics. Scientists believe these particles also show promise for drug delivery for treating cancer and other diseases. However, researchers still have not found an ideal way to target these dots to specific tissues or organs in order to maximize their effectiveness and limit toxicity.

They describe development of a new type of quantum dot coated with certain sugar molecules that are attracted to receptors in specific tissues and organs. In a study with laboratory mice, the scientists coated quantum dots with either mannose or galactosamine, two sugars that accumulate selectively in the liver. The sugar-coated dots became three times more concentrated in the mice livers than the regular dots, demonstrating their higher specificity, the researchers say.

More information: Journal of the American Chemical Society, “In Vitro Imaging and in Vivo Liver targeting with Carbohydrate Capped Quantum Dots”

Provided by ACS

Explore further: Quantum dot solar windows go non-toxic, colorless, with record efficiency

Related Stories

'Quantum dot' technology may help light the future

August 19, 2015

Advances at Oregon State University in manufacturing technology for "quantum dots" may soon lead to a new generation of LED lighting that produces a more user-friendly white light, while using less toxic materials and low-cost ...

Recommended for you

Electrical circuit made of gel can repair itself

August 25, 2015

(Phys.org)—Scientists have fabricated a flexible electrical circuit that, when cut into two pieces, can repair itself and fully restore its original conductivity. The circuit is made of a new gel that possesses a combination ...

Biological tools create nerve-like polymer network

August 24, 2015

Using a succession of biological mechanisms, Sandia National Laboratories researchers have created linkages of polymer nanotubes that resemble the structure of a nerve, with many out-thrust filaments poised to gather or send ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.