Unconjugated gold colloids

Nanometre sized gold particles of uniform shape and size are invaluable tools in nanotechnology, eg. assembled arrays, light scattering and single molecule detection.

The colloids can be conjugated to antibodies, proteins or many types of macromolecules for binding and reaction labelling studies.The colloids are manufactured with a very narrow size distribution. The pH ranges are approximately 6 for 5nm gold and less than 9 for the larger sized particles.

Colloidal gold is available in sizes ranging from 2 - 250nm: 2 - 20nm optimised for electron microscopy; 30 - 80nm optimised for lateral flow in vitro diagnostics and 100 - 250nm for optical microscopy.

All gold colloids are supplied at optical density 1.0 measured at 520 nm. They contain 0.01 % concentration of HAuCl, except 2 nm size which has a concentration of 0.002 %.

Please note: These products require refrigeration storage between 2-8˚C. As a result, and to retain the integrity of the product, we will not ship on Fridays or where we cannot confirm a next day delivery. Additionally we can not accept customers returns for these products if ordered in error as the storage has been outside our control.