It's not a magic trick and it's not sleight of hand scientists really are using levitation to improve the drug development process, eventually yielding more effective pharmaceuticals with fewer side effects.
Scientists at the U.S. Department of Energy's (DOE) Argonne National Laboratory have discovered a way to use sound waves to levitate individual droplets of solutions containing different pharmaceuticals. While the connection between levitation and drug development may not be immediately apparent, a special relationship emerges at the molecular level.
At the molecular level, pharmaceutical structures fall into one of two categories: amorphous or crystalline. Amorphous drugs typically are more efficiently taken up by the body than their crystalline cousins; this is because amorphous drugs are both more highly soluble and have a higher bioavailability, suggesting that a lower dose can produce the desired effect.
"One of the biggest challenges when it comes to drug development is in reducing the amount of the drug needed to attain the therapeutic benefit, whatever it is," said Argonne X-ray physicist Chris Benmore, who led the study.
"Most drugs on the market are crystalline they don't get fully absorbed by the body and thus we aren't getting the most efficient use out of them," added Yash Vaishnav, Argonne Senior Manager for Intellectual Property Development and Commercialization.
Getting pharmaceuticals from solution into an amorphous state, however, is no easy task. If the solution evaporates while it is in contact with part of a vessel, it is far more likely to solidify in its crystalline form. "It's almost as if these substances want to find a way to become crystalline," Benmore said.
In order to avoid this problem, Benmore needed to find a way to evaporate a solution without it touching anything. Because liquids conform to the shape of their containers, this was a nearly impossible requirement -
|Contact: Jared Sagoff|
DOE/Argonne National Laboratory