In vitro release of gadolinium-DTPA from liposomal formulations. Percent release of Magnevist from DOTAP- and DOPC-DOPE-liposomes. Magnevist solution alone was used as a control. Dissolution was performed for three hours at 37°C in a flow-through cell equipped with liposome adapters and in closed circulation. Results are arithmetic means, error bars represent SD, n = 3.