雙水磷酸氫鈣 ( CaHPO4•2H2O ) 為無毒性、可生物降解,且具良好生物相容性之材料。本研究在製備的過程中,藉由摻雜二價鐵離子 ( Fe2+ ),取代雙水磷酸氫鈣中鈣離子 ( Ca2+ ) 的晶格點位置,可使材料具有磁性。若將材料置於癌細胞內部或腫瘤表面,再施予外加交流磁場,即可利用磁滯損失產生熱,使溫度上升至43~46℃,進而便可殺死癌細胞。 然而為了延長材料在血液中停留的時間,和提高標靶的成功率,我們將進行材料的表面改質,在材料表面接枝上聚乙二醇 ( PEG ) 和葉酸 ( FA )。在本研究中,我們先利用共沉法製備出含鐵之磁性雙水磷酸氫鈣,過程中將導入具有多種官能基之天然高分子明膠 ( gelatin ) 當作連結分子,使PEG-FA可以改質於磁性的雙水磷酸氫鈣上,期望將來有機會利用霧化吸入的方式應用於肺癌熱療上。
Dicalcium phosphate dehydrate ( DCPD ) is the major component of hard tissues like bone and teeth, which is non-toxic, biocompatibility and biodegradable. In this study, the Fe-DCPD particles was formed by co-precipitation method. The iron ions can substitute calcium ions of DCPD and form a magnetic DCPD;by doing this it can release heat in alternating magnetic field because it has magnetism. As temperature rise up to 43~46℃, the heat treatment will cause cancer cells dead. However, in order to extend the blood circulation time and improve the targeting rate, the surface modification is necessary. Therefore, gelatin was used as a mediator to immobilize polyethylene glycol (PEG) and folic acid (FA) on the magnetic particle surface. It is believed that magnetic Fe-DCPD/Gelatin-PEG-FA is one of the most potential materials in lung cancer hyperthermia by using in halation in the future.