Characterization and stability of liposome-enveloped trypsin/Fe3O4 for drug delivery and drug release behavior.

Liposome encapsulating Fe3O4 (liposome complexes) has been prepared for targeting a drug to a specific organ, as well as for MRI (magnetic resonance imaging) contrast agents. The objective of the present work was to investigate the Fe3O4 properties and the effects of chitosan concentration on the characteristics of chitosan-coated liposome complexes. They were characterized by DLS, FT-IR, XRD, VSM, UV-Vis spectrometer, TEM and phase-contrast microscopy.

Preparation of nano-sized Sn powders by phase transformation and their oxidation behavior.

Synthesis behavior and microstructural characteristics of nano-sized SnO2 powders were investigated. SnO2 powders were synthesized by controlled heat treatment of nano-sized Sn powders in air. Microstructural observation revealed that the nano-sized SnO2 powders could be successfully prepared by controlled oxidation treatment with a low heating rate and further ball milling.