Methoxy polyethylene glycol epoetin beta which has a long half-life is developed to provide stable control of hemoglobin levels at extended administration intervals compared to darbepoetin alfa. The purpose of this st...Methoxy polyethylene glycol epoetin beta which has a long half-life is developed to provide stable control of hemoglobin levels at extended administration intervals compared to darbepoetin alfa. The purpose of this study was to compare the patterns of use, efficiency of therapy and cost with undergoing hemodialysis patients. Electronic medical record system was used to examine administration frequency, hemoglobin response rate, achievement of target hemoglobin, drug costs. Administration frequency was once in 4 weeks with methoxy polyethylene glycol epoetin beta group and 3 times in 4 weeks with darbepoetin alfa group. Hemoglobin response rate was 61.5% in methoxy polyethylene glycol epoetin beta at the time of 16 weeks. It was not significantly different from 66.7% in darbepoetin alfa （P = 1.000）. The drug cost for methoxy polyethylene glycol epoetin beta group was little higher than darbepoetin alfa group. However, there was no statistically significant difference （P = 0.164）. Use of methoxy polyethylene glycol epoetin beta is as effective and safe as darbepoetin alfa managing renal anemia in hemodialysis patients. Methoxy polyethylene glycol epoetin beta＇s extended administration interval improve patient＇s compliance and enable effective anemia treatment.展开更多
Amphiphilic diblock copolymers composed of methoxy polyethylene glycol （MePEG） and poly（D,L-lactide） （PDLLA） were prepared for the preparation of polymeric micelles, The use of MePEG-PDLLA as drug carriers has b...Amphiphilic diblock copolymers composed of methoxy polyethylene glycol （MePEG） and poly（D,L-lactide） （PDLLA） were prepared for the preparation of polymeric micelles, The use of MePEG-PDLLA as drug carriers has been reported in the open literature, but there are only few data on the application of a series of MePEG-PDLLA copolymers with different lengths in the medical field, The shape of the polymeric micelles is also important in drug delivery, Studies on in vitro drug release profiles require a good sink condition. The critical micelle concentration of a series of MePEG-PDLLA has a significant role in drug release. To estimate their feasibility as a drug carrier, polymeric micelles made of MePEG-PDLLA block copolymer were prepared by the oil in water （O/VV） emulsion method. From dynamic light scattering （DLS） measurements, the size of the micelle formed was less than 200 nm, The critical micelle concentration of polymeric micelles with various compositions was determined using pyrene as a fluorescence probe. The critical micelle concentration decreased with increasing number of hydrophobic segments. MePEG-PDLLA micelles have a considerably low critical micelle concentration （0.4～0.5 μg/mL）, which is apparently an advantage in utilizing these micelles as drug carriers. The morphology of the polymeric micelles was observed using scanning electron microscopy （SEM） and transmission electron microscopy （TEM）, The micelles were found to be nearly spherical. The yield of the polymeric micelles obtained from the O/W method is as high as 85%.展开更多
文摘Methoxy polyethylene glycol epoetin beta which has a long half-life is developed to provide stable control of hemoglobin levels at extended administration intervals compared to darbepoetin alfa. The purpose of this study was to compare the patterns of use, efficiency of therapy and cost with undergoing hemodialysis patients. Electronic medical record system was used to examine administration frequency, hemoglobin response rate, achievement of target hemoglobin, drug costs. Administration frequency was once in 4 weeks with methoxy polyethylene glycol epoetin beta group and 3 times in 4 weeks with darbepoetin alfa group. Hemoglobin response rate was 61.5% in methoxy polyethylene glycol epoetin beta at the time of 16 weeks. It was not significantly different from 66.7% in darbepoetin alfa （P = 1.000）. The drug cost for methoxy polyethylene glycol epoetin beta group was little higher than darbepoetin alfa group. However, there was no statistically significant difference （P = 0.164）. Use of methoxy polyethylene glycol epoetin beta is as effective and safe as darbepoetin alfa managing renal anemia in hemodialysis patients. Methoxy polyethylene glycol epoetin beta＇s extended administration interval improve patient＇s compliance and enable effective anemia treatment.
基金Supported by the National Natural Science Foundation of China (No. 29836130)
文摘Amphiphilic diblock copolymers composed of methoxy polyethylene glycol （MePEG） and poly（D,L-lactide） （PDLLA） were prepared for the preparation of polymeric micelles, The use of MePEG-PDLLA as drug carriers has been reported in the open literature, but there are only few data on the application of a series of MePEG-PDLLA copolymers with different lengths in the medical field, The shape of the polymeric micelles is also important in drug delivery, Studies on in vitro drug release profiles require a good sink condition. The critical micelle concentration of a series of MePEG-PDLLA has a significant role in drug release. To estimate their feasibility as a drug carrier, polymeric micelles made of MePEG-PDLLA block copolymer were prepared by the oil in water （O/VV） emulsion method. From dynamic light scattering （DLS） measurements, the size of the micelle formed was less than 200 nm, The critical micelle concentration of polymeric micelles with various compositions was determined using pyrene as a fluorescence probe. The critical micelle concentration decreased with increasing number of hydrophobic segments. MePEG-PDLLA micelles have a considerably low critical micelle concentration （0.4～0.5 μg/mL）, which is apparently an advantage in utilizing these micelles as drug carriers. The morphology of the polymeric micelles was observed using scanning electron microscopy （SEM） and transmission electron microscopy （TEM）, The micelles were found to be nearly spherical. The yield of the polymeric micelles obtained from the O/W method is as high as 85%.
文摘以聚乙二醇单甲醚(MPEG)和甲基丙烯酸(MAA)为主要原料,通过酯化反应制备聚羧酸系减水剂大单体聚乙二醇单甲醚甲基丙烯酸酯(MPEGMA).以酯化率作为衡量指标,研究了酸醇摩尔比(n(MAA)/n(MPEG))、催化剂用量、阻聚剂用量、酯化温度及酯化时间对酯化反应的影响.结果表明:最佳酯化条件包括:n(MAA)/n(MPEG)为2.5,催化剂用量为MPEG与MAA质量和的2%,阻聚剂用量为MAA质量的2%,酯化温度为120℃,酯化时间为7 h.以最佳酯化工艺制得的大单体为原料制备的聚羧酸系减水剂,具有良好的分散性和保塑性,掺该减水剂0.15%(质量分数)的水泥净浆的初始流动度达303 mm,1 h后其流动度为297 mm.
