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A silk coat for diamonds makes sleek new imaging and drug delivery tool
Date:1/27/2014

WASHINGTON, Jan. 27Silk and diamonds aren't just for ties and jewelry anymore. They're ingredients for a new kind of tiny glowing particle that could provide doctors and researchers with a novel technique for biological imaging and drug delivery.

The new particles, just tens of nanometers across, are made of diamond and covered in silk. They can be injected into living cells, and because they glow when illuminated with certain kinds of light, biologists can use them to peer inside cells and untangle the molecular circuitry that governs cellular behavior, or to study how cells react to a new drug. The silk-coated diamond particles could also potentially be used someday in the clinic, by allowing doctors to send infection-fighting antibiotics to a targeted area of the body.

A team of researchers from Australia and the United States describes this new hybrid diamond-silk material in a paper published today in The Optical Society's (OSA) journal Biomedical Optics Express.

Nanodiamonds similar to those in this study have been explored previously for their potential medical uses, but this is the first time silk has been incorporated with nanodiamonds, said Asma Khalid of the University of Melbourne, who is the first author of the Biomedical Optics Express paper. "This nanodiamond-silk hybrid material is important due to the potential it offers to the fields of bioimaging, biosensing and drug delivery," she explained.

Diamonds are crystals of carbon. But they can be made with defectsother atoms inserted in the crystal structureand these defects allow them to do tricks that flawless diamonds can't, such as absorbing and reemitting light of certain wavelengths, a process called fluorescence. Because these fluorescent nanodiamonds are bright, stable, and harmless to living tissue and can work at room temperature researchers have been exploring their use in
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Contact: Angela Stark
astark@osa.org
202-416-1443
The Optical Society
Source:Eurekalert  

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