1 nm = ? m
Atom Molecular
Nanoparticle
Macroscopic objects
0.1-1.0 nm
1-100 nm
>1 mm
Properties surface effect
of Nanoparticles：
small size effect quantum effect
ζ电位是双电层切平面处的电位，是衡量纳 米药物稳定性的标准之一，绝对值越高，纳 米药物越稳定，用激光多普勒电泳法测定。 electrostatic stabilization and steric stabilization :ζ ≥ 20 mV； electrostatic stabilization :ζ ≥ 30 mV
2.The physical stability of nano-drug
Stability of Nano-drug ：physical, chemical and biological stability
物理化学 的角度
sedimentation aggregation crystal growth crystalline state change
1.Formulations affect the stability
Nano-drug are widely used in oral, eye, lung and skin delivery systems. They have same phenomenon of instability for different forms, such as precipitation, agglomeration and crystal growth, but these phenomenon have different effect on clinical. Moreover, the choice of stabilizer are also closely related to formulations.
