In this paper,the preparation and properties of mitomycin C dextran-microspheres(MMC-DMS)were reported.The characteristics of pharmacokinetics and embolization effects of MMC-DMS in vivo were studied in dogs.The avera...In this paper,the preparation and properties of mitomycin C dextran-microspheres(MMC-DMS)were reported.The characteristics of pharmacokinetics and embolization effects of MMC-DMS in vivo were studied in dogs.The average diameter of the microspheres was 75±19μm and the content was 5% of MMC.In in vitro experiment, the release rate of drug demonstrated that the microspheres had sustained-release properties. The microspheres and conventional MMC were infused into the hepatic artery of dogs through a catheter for embolization,respectively.The plasma concentration of MMC was de- termined by HPLC.Results showed that the peak concentration of conventional MMC was 2.6 times as much as MMC-DMS.Angiograms revealed that peripheral blood vessels de- creased obviously in liver.The histopathologic examination showed that the microspheres lodged in the hepatic artery and displayed nodular necrosis in the embolized segment.The MMC-DMS were used in clinical trial in 100 patients with hepatic cancer.The tumor reduc- tion and improvement of symptoms in patients were observed after hepatic arterial embolization.The survival duration was prolonged.Results showed that the MMC-DMS is a promising embolic agent for treatment of hepatic cancer.It could aid in the use of intensive chemotherapy with minimum systemic side effect.展开更多
Herein,the orthogonal test was used to optimize the preparation conditions and technique of mitoxantrone ethylcellulose microsphere fDHAQ-EC-MS)for liver arterial embolization.The dynamic dialysis method was used to s...Herein,the orthogonal test was used to optimize the preparation conditions and technique of mitoxantrone ethylcellulose microsphere fDHAQ-EC-MS)for liver arterial embolization.The dynamic dialysis method was used to study the drug release characteristics ofthe DRAQ-EC-MS.The suspension of DHAQ-EC-MS for clinical liver arterial embolization was prepared.The results show that the DHAQ-EC-MS is regular in morphology with a mean diameter of 110.24 ± 38.19μm and 86.5% of them within the range of 40-150μm,The drug loading is 12.5% and the embedding ratio is 55.6%. The release characteristics were in accordance with the single exponential model.The drug release equation is log(Y∞-Y)=-0.116t-1.198 × 10￣(-3)(r=0.9992,t(50)=2.6h).The suspension is ofstable physical and chemical properties and is suitable for clinical use.展开更多
The preparation and properties of adriamycin magnetic gelatin microspheres(Adr- MG-ms)were reported.The synthesis of magnetic iron oxide ultrafine particle and embolization effects of magnetic gelatin microspheres(MG-...The preparation and properties of adriamycin magnetic gelatin microspheres(Adr- MG-ms)were reported.The synthesis of magnetic iron oxide ultrafine particle and embolization effects of magnetic gelatin microspheres(MG-ms)in dog were studied.Adr- MG-ms consist of 2%(w/w)of adriamycin(Adr)as the core,and 68% of gelatin and 30% of magnetite as the shell with a mean particle size of 22 μm. In vitro experiment,the release rate of drug demonstrated that the microspheres have sustained-release properties.The average diameter of magnetic iron oxide was approximately l0 nm. Transcatheter embolization with MG-ms and ￣(99m)Tc-labelled MG-ms was performed under external magenet control in dog liver,respectively.Gamma photography and angiogram revealed that MG-ms level was almost equal both in left and right hepatic arteries without magnet,while with magnet(1200 Gs),MG-ms level in left hepatic artery(target site)was about 2.25 fold higher than in right hepatic artery,and few MG-ms in thyroid gland,brain and heart was observed.Results showed that the MG-ms is a promising embolic agent for treatment of hepatic cancer under external magnet control.展开更多
文摘In this paper,the preparation and properties of mitomycin C dextran-microspheres(MMC-DMS)were reported.The characteristics of pharmacokinetics and embolization effects of MMC-DMS in vivo were studied in dogs.The average diameter of the microspheres was 75±19μm and the content was 5% of MMC.In in vitro experiment, the release rate of drug demonstrated that the microspheres had sustained-release properties. The microspheres and conventional MMC were infused into the hepatic artery of dogs through a catheter for embolization,respectively.The plasma concentration of MMC was de- termined by HPLC.Results showed that the peak concentration of conventional MMC was 2.6 times as much as MMC-DMS.Angiograms revealed that peripheral blood vessels de- creased obviously in liver.The histopathologic examination showed that the microspheres lodged in the hepatic artery and displayed nodular necrosis in the embolized segment.The MMC-DMS were used in clinical trial in 100 patients with hepatic cancer.The tumor reduc- tion and improvement of symptoms in patients were observed after hepatic arterial embolization.The survival duration was prolonged.Results showed that the MMC-DMS is a promising embolic agent for treatment of hepatic cancer.It could aid in the use of intensive chemotherapy with minimum systemic side effect.
文摘Herein,the orthogonal test was used to optimize the preparation conditions and technique of mitoxantrone ethylcellulose microsphere fDHAQ-EC-MS)for liver arterial embolization.The dynamic dialysis method was used to study the drug release characteristics ofthe DRAQ-EC-MS.The suspension of DHAQ-EC-MS for clinical liver arterial embolization was prepared.The results show that the DHAQ-EC-MS is regular in morphology with a mean diameter of 110.24 ± 38.19μm and 86.5% of them within the range of 40-150μm,The drug loading is 12.5% and the embedding ratio is 55.6%. The release characteristics were in accordance with the single exponential model.The drug release equation is log(Y∞-Y)=-0.116t-1.198 × 10￣(-3)(r=0.9992,t(50)=2.6h).The suspension is ofstable physical and chemical properties and is suitable for clinical use.
文摘The preparation and properties of adriamycin magnetic gelatin microspheres(Adr- MG-ms)were reported.The synthesis of magnetic iron oxide ultrafine particle and embolization effects of magnetic gelatin microspheres(MG-ms)in dog were studied.Adr- MG-ms consist of 2%(w/w)of adriamycin(Adr)as the core,and 68% of gelatin and 30% of magnetite as the shell with a mean particle size of 22 μm. In vitro experiment,the release rate of drug demonstrated that the microspheres have sustained-release properties.The average diameter of magnetic iron oxide was approximately l0 nm. Transcatheter embolization with MG-ms and ￣(99m)Tc-labelled MG-ms was performed under external magenet control in dog liver,respectively.Gamma photography and angiogram revealed that MG-ms level was almost equal both in left and right hepatic arteries without magnet,while with magnet(1200 Gs),MG-ms level in left hepatic artery(target site)was about 2.25 fold higher than in right hepatic artery,and few MG-ms in thyroid gland,brain and heart was observed.Results showed that the MG-ms is a promising embolic agent for treatment of hepatic cancer under external magnet control.
