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AssigneeAndcare, Inc.
InventorsSteven Wegner, Michael A. Harpold, Terence M. McCaffrey, Susan E. Morris, Marek Wojciechowski, Junguo Zhao, Robert W. Henkens, Najih Naser, John P. O'Daly
Estimating the term…
The present invention provides a new device for use in measuring lead levels in biological and environmental samples. Using square wave coulometry and colloidal gold particles impregnated on carbon electrodes, the present invention provides a rapid, reliable, portable and inexpensive means of detecting low lead levels. The colloidal gold modified electrodes have microelectrode array characteristics and produce significantly higher stripping detection signals for lead than are produced at bulk gold electrode surfaces. The method is effective in determining levels of lead down to at least 5 .mu.g/dL in blood samples as small as 10 .mu.L.
An electrode comprising a conducting substrate onto which is deposited 10-30 .mu.g/cm.sup.2 of colloidal gold admixed with a cationic polymer.
An electrode comprising colloidal gold dispersed in a cationic polymer matrix that is deposited onto an electrode surface to form a microelectrode array.
An electrode comprising a carbon ink substrate onto which is deposited a film consisting essentially of colloidal gold particles having a size of about 200-500 .ANG. admixed with a poly(ester-sulfonic acid) polymer.
Dependencies are inferred from the claim text.