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Novel methods to view how a drug attaches to a cell

Researchers John Shelnutt and Yujiang Song from Sandia National Laboratories have discovered an innovative method to see how a drug attaches //to a cell which involves a new process that creates hollow platinum nanostructures. Sandia is a National Nuclear Security Administration laboratory.

An upcoming issue of the German chemical journal will publish the research as a paper in Angewandte Chemie Int. Ed which has currently published the same as an advance publication featured as a short article on its website. Shelnutt and Song in their paper explain a new way of producing porous, nanoscopic, hollow platinum spheres by using liposomes as blueprints. (Liposomes are microscopic, fluid-filled pouches that delivers vaccines, enzymes, or drugs to the body.) In earlier work, Shelnutt's group grew large continuous nanosheets of platinum on liposome templates, forming foam-like platinum nanostructures. This method provided no way to control shape and size.

The innovative method reported in the paper uses a different technique to produce porous platinum nanocages with diameters up to 200 nm. Instead of large sheets, they consist of many small flat-branched platinum structures - called dendrites - which join together in a network or cage in the shape of the spherical liposome.

The liposome that Shelnutt and his team used as a blueprint consists of a double layer of lipid (detergent) molecules. The liposomes are placed in a solution containing a platinum salt. When these liposomes are irradiated with light, photocatalysts located in the narrow space between the two layers of the lipid transfer electrons to the platinum ions. The uncharged platinum atoms gather into tiny metal clumps. Once they reach a certain size, they also become active and catalyze the dendrite growth by adding more platinum atoms from the platinum salt.

Little by little, small, flat, platinum dendrites form within the double lipid layer.

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