Example 17
50 μmol (Gd3+) of AGuIX® were redispersed in 125 μl of ultrapure water in order to obtain a solution at 400 mM [Gd3+]. 2.8 mg of cisplatin are placed in a 2.5 ml flask. 1.1 ml of ultrapure water are added to the flask, which is stirred. Since cisplatin is not very soluble at ambient temperature, it is necessary to heat to 40° C. until it is completely dissolved. A solution containing 2.5 g/l of cisplatin is then obtained, and is protected from the light with aluminium. 229 μl of this solution are then added to the solution of AGuIX®, as are 146 μl of ultrapure water. The flask is stirred for 30 minutes in the dark. A solution containing 100 mM of gadolinium and 1160 mg/l of cisplatin is thus obtained.
This solution is placed in a 3 kDa Vivaspin®, and a tangential filtration cycle is carried out so as to obtain a supernatant of 160 μl. The subnatant is analysed by UV-visible analysis. The cisplatin is detectable by UV/VIS absorption at a wavelength of 706 nm after reaction with ODPA. For the reaction with cisplatin, a solution of ODPA at 1.4 mg/ml and a phosphate buffer (pH 6.8) are prepared. The subnatant is diluted 5-fold. 140 μl of this solution are added to 200 μl of buffer and 100 μl of ODPA. The resulting solution is heated at 100° C. for 15 min.
Once the reaction is finished and the temperature has returned to ambient temperature, 560 μl of DMF are added. The final solution is filtered and then analysed by UV-visible analysis.
