目的采用搅拌超声法制备蟾毒配基脂质-蛋白杂化纳米粒,延缓药物的体外释放。方法以单因素考察法优化处方及制备工艺,并应用透射电镜观察制剂形态,动态光散射法测定粒径和ζ-电位,差示扫描量热法和X-射线衍射法表征药物在制剂中的存在形...目的采用搅拌超声法制备蟾毒配基脂质-蛋白杂化纳米粒,延缓药物的体外释放。方法以单因素考察法优化处方及制备工艺,并应用透射电镜观察制剂形态,动态光散射法测定粒径和ζ-电位,差示扫描量热法和X-射线衍射法表征药物在制剂中的存在形式,透析法考察纳米粒及溶液剂中药物的释放行为。结果纳米粒外观圆整均匀,平均粒径为(82.4±28.5)nm,ζ-电位为-19.44 m V,药物在制剂中以无定形态存在,与溶液剂相比,纳米粒可显著延缓药物释放,其释放行为符合Weibull模型,释放机制以扩散为主。结论利用搅拌超声法,以白蛋白和卵磷脂作为载体和稳定剂制备的脂质-蛋白杂化纳米粒可显著延缓蟾毒配基的体外释放。展开更多
This study presents an effective numerical model for the dynamic response of poroelastic seabed under wave action with enhanced performance. The spatial discretization is based on the Element-Free Galerkin （EFG） met...This study presents an effective numerical model for the dynamic response of poroelastic seabed under wave action with enhanced performance. The spatial discretization is based on the Element-Free Galerkin （EFG） method and the time integration based on the GN11 scheme. A stability strategy that adopts a smaller number of nodes for the pore water pressure compared with those for the displacements of the soil skeleton is suggested to resolve the similar difficulty as encountered in the finite element method for a problem with mixed formulation when the pore water is incompressible and the soil skeleton impervious. The accuracy of the numerical model is verified through applying it to a typical case with critical permeability. Good agreement between computational and analytical solutions is obtained.展开更多
文摘目的采用搅拌超声法制备蟾毒配基脂质-蛋白杂化纳米粒,延缓药物的体外释放。方法以单因素考察法优化处方及制备工艺,并应用透射电镜观察制剂形态,动态光散射法测定粒径和ζ-电位,差示扫描量热法和X-射线衍射法表征药物在制剂中的存在形式,透析法考察纳米粒及溶液剂中药物的释放行为。结果纳米粒外观圆整均匀,平均粒径为(82.4±28.5)nm,ζ-电位为-19.44 m V,药物在制剂中以无定形态存在,与溶液剂相比,纳米粒可显著延缓药物释放,其释放行为符合Weibull模型,释放机制以扩散为主。结论利用搅拌超声法,以白蛋白和卵磷脂作为载体和稳定剂制备的脂质-蛋白杂化纳米粒可显著延缓蟾毒配基的体外释放。
基金supported by the National Natural Science Foundation of China (Grant No. 10772099)
文摘This study presents an effective numerical model for the dynamic response of poroelastic seabed under wave action with enhanced performance. The spatial discretization is based on the Element-Free Galerkin （EFG） method and the time integration based on the GN11 scheme. A stability strategy that adopts a smaller number of nodes for the pore water pressure compared with those for the displacements of the soil skeleton is suggested to resolve the similar difficulty as encountered in the finite element method for a problem with mixed formulation when the pore water is incompressible and the soil skeleton impervious. The accuracy of the numerical model is verified through applying it to a typical case with critical permeability. Good agreement between computational and analytical solutions is obtained.
