Tuesday, May 20, 2008
Student Union Building, Upper (Queensborough Community College)
543

Novel DNA Staining Technique Employing Gold Phosphine Salts: Application for Nanowire Synthesis

Jacopo Samson1, Charles Michael Drain1, and Patrick Nahirney2. (1) Hunter College of City University of New York, New York, NY, (2) Rockefeller University, New York, NY

Attempts to image DNA via transmission electron microscopy (TEM) have been made since its discovery. Although numerous staining (positive as well as negative) techniques have been adopted to resolve the DNA strands, they do not show significant detail about its helical and periodical structure. A very common challenge has been to avoid the re-aggregation of DNA in aqueous solution caused by the drastic change of pH upon treatment with uranyl acetate or other compounds. Here we report a novel technique that exploits the electrostatic interaction between the negatively charged DNA phosphate backbone and the positively charged trimethyl phosphine gold (I) ion. This simple technique employs deionized water, plasmid DNA (3ug/mL) and a saturated aqueous solution of the gold phosphine salt. These characteristics make this technique very environmentally friendly and inexpensive. Potential applications of this technique may involve formation of nanowires used in creating microcircuits and other nanoscale conductive networks.