EXAMPLE 1
Chemicals
Hydrogen tetrachloroaurate trihydrate (HAuCl4.3H2O), pamoic acid (PA), sodium hydroxide and sodium citrate (Na3-citrate) dihydrate were all purchased from Sigma-Aldrich Company and utilized directly without further purification. All solutions were prepared with ultrapure deionized water obtained from a water purification system (Millipore WR600A, Yamato Co., Japan and/or Barnstead Nanopure, Thermoscientific 7148, USA).