Perfluorooctyl bromide pfob

Barium sulphate (98%), eicosane (99%), octacosane (99%) were purchased from Acros Organics. Oleic acid (technical grade, 90%), calcium carbonate (99%), agar (powder, for microbiology), iron (II, III) oxide (nanopowder, 50–100 nm particle size (SEM), 97% trace metals basis, used as a magnetite XRD standard) and Crystal Violet (hexamethylpararosaniline chloride, >90%) were purchased from Sigma-Aldrich. Iron(III) chloride hexahydrate (98%) was purchased from Alfa Aesar reagents. Iron(II) sulphate heptahydrate (98%), sodium hydroxide pellets (Analytical reagent grade) and ammonium hydroxide solution (28% in water) were purchased from Fisher Scientific, and perfluorooctyl bromide (PFOB, 97%) from Fluorochem Ltd. Iohexol (Omnipaque 300) was obtained from GE healthcare. Aspirin tablets were bought commercially from Boots Ltd. Laboratory solvents were purchased from Sigma Aldrich Limited and were of analytical grade. Aqueous solutions were prepared using UHQ deionised water with a resistivity of not less than 18.2 MΩ cm⁻¹. N₂ (oxygen free) gas was purchased from BOC Ltd. and used as received. Gelatin capsules were purchased from CapsulCN, China.