During the experiment, it would be beneficial to have the transporter dissolved in DMSO at a sufficiently high concentration to make serial dilutions from this stock solution. Note: while HPTS is stable in ambient light, solutions containing iodide or very light-sensitive compounds should be protected by wrapping the storage container in aluminium foil. Under ambient conditions, iodide can be oxidised to iodine, which can function as an anion transporter causing undesirable non-transporter related anion transport to occur, skewing results.