The production of bone substitute biomimetic materials which could also act as antitumoral drug release agents is of enormous interest. We report in this paper the synthesis and characterization of a novel platinum dinuclear complex containing a geminal bisphosphonate and its embodiment into xerogels prepared by the sol–gel method. Our goal was to obtain a hybrid inorganic matrix that could release a platinum species active against bone tumors or metastases, upon local implant. Two silica xerogels were considered: one was composed of pure silica, while the other contained also some calcium as potential release-modulating agent thanks to its high affinity for bisphophonates. The platinum-complex loading capacity of the inorganic matrices, the release kinetics in buffer simulating physiological conditions, and the stability upon storage were investigated as a function of Pt-complex concentration and calcium addition. We found that the presence of calcium in the composites deeply influences not only the stability of the formulations but also the nature of the platinum complex liberated in solution.
制造可以作为
抗肿瘤药物释放剂的骨替代
生物仿制材料引起了极大的兴趣。我们在本文中报告了一种新型
铂双核复合物的合成和表征,该复合物含有双烯基双
磷酸盐,并将其嵌入通过溶胶-凝胶法制备的干凝胶中。我们的目标是获得一种混合无机基体,能够在局部植入后释放对骨肿瘤或转移有效的
铂物种。我们考虑了两种
硅干凝胶:一种由纯
硅组成,另一种则还含有一些
钙,作为潜在的释放调节剂,因为其对双
磷酸盐具有高度亲和力。我们研究了无机基体的
铂复合物负载能力、在模拟生理条件下的缓冲释放动力学以及储存时的稳定性,作为
铂复合物浓度和
钙添加的函数。我们发现,
钙的存在对复合材料的稳定性深刻影响,不仅如此,还影响了在溶液中释放的
铂复合物的性质。