Hydrogen tetra chloroauric hydrate

Hydrogen tetra-chloroauric hydrate (HAuCl₄ xH₂O, 99.9%), sodium borohydride (NaBH₄, 99%), silver nitrate (AgNO₃, 99%), cetyltrimethylammonium bromide (CTAB, ≥99%), Hydroquinone (HQ, 99%), sodium oleate, (NaOL, ≥99%), hydrochloric acid (HCl, (12.1 M)), Dulbecco’s Modified Eagle Medium (DMEM), Dulbecco’s phosphate-buffered saline (PBS), Roswell Park Memorial Institute (RPMI) medium, graphite powder, sulfuric acid (H₂SO₄, 95.0–98.0%), sodium nitrate (NaNO₃, 99%), potassium permanganate (KMnO₄, 99%), peroxide (H₂O₂, 30%), and sodium hydroxide (NaOH, ≥98%) were purchased from Sigma-Aldrich, (Kempton Park, South Africa). All glassware used in the experiments was cleaned, washed thoroughly with MilliQ water (15.0 MΩ cm @ 25 °C), and dried before use.

Hydrogen tetra-chloroauric hydrate (HAuCl₄·H₂O, 99.9%), sodium borohydride (NaBH₄, 99%), silver nitrate (AgNO₃, 99%), cetyltrimethylammonium bromide (CTAB, ≥99%), ascorbic acid (AA, 99%), sodium oleate, (NaOL, ≥99%), phosphate-buffered saline (PBS), Roswell Park Memorial Institute (RPMI) medium, hydrochloric acid (HCl, (12.1 M)), graphite powder, sulfuric acid (H₂SO₄), sodium nitrate (NaNO₃), potassium permanganate (KMnO₄), peroxide (H₂O₂), sodium hydroxide (NaOH), 3-pyridylcarboxaldehyde, propionic acid, pyrrole, sodium bicarbonate, ethanol, dichloromethane, methanol, ethyl acetate, n-hexane, chloroform, acetone, disodium hydrogen phosphate buffer, petroleum ether, calcium chloride, methylene blue, diethyl ether, a 1,3-diphenyl benzofuran and methyl iodide were purchased from Sigma-Aldrich, Kempton Park, South Africa. All solutions of gold salt, AgNO₃ and NaBH₄ were freshly prepared. All glassware used in the experiments were cleaned and washed thoroughly with MilliQ water (15.0 MΩ cm @ 25 °C) and dried before use.