Dong-Hyun Paik

Entrapment of protein using electrosprayed poly(D,L-lactide-co-glycolide) microspheres with a porous structure for sustained release.

The entrapment of a protein in porous poly(D,L-lactide-co-glycolide) (PLGA) microspheres is demonstrated through the closure of their outer surface pores for sustained delivery of the protein. The porous PLGA microspheres with less than 10 μm in size are prepared by electrospraying. Aqueous solutions containing fluorescein isothiocyanate-dextran or bovine serum albumin (BSA) are penetrated into the inner pores as a result of vacuum treatment, and the outer surface pores of the porous PLGA microspheres are then closed using a solvent (dimethyl sulfoxide) to ensure entrapment of the macromolecules. Confocal microscopy images confirm the presence of a large amount of the macromolecules inside the porous structure. Circular dichroism spectroscopy and release analysis reveal that BSA is entrapped without denaturation and released in a sustained manner for a period of over 2 months, respectively.

Fabrication of aligned fibrous tubular scaffolds reinforced by suture wire for tracheal regeneration

Abstract

Edible HPMC films with indomethacin/HPMCP microparticles in oral delivery for taste-masking

Abstract

Electrosprayed Folic Acid-Conjugated Ursolic Acid Nanoparticles for Tumor Therapy

We describe a simple method for the fabrication of folic acid-conjugated ursolic acid (FA-UA) nanoparticles using electrospraying. The FA-UA nanoparticles had an average size of 90.6 nm and exhibited greater cellular uptake compared with pristine UA and electrosprayed UA nanoparticles. We also evaluated the cytotoxicity of pristine UA, electrosprayed UA nanoparticles, and FA-UA nanoparticles over time and under different UA concentrations. In vitro, the FA-UA nanoparticles showed significantly higher cytotoxicity in KB cells compared with pristine UA and electrosprayed UA nanoparticles. These results were corroborated by LIVE/DEAD staining and fluorescence imaging of cancer cells. Thus, FA-UA nanoparticles can potentially be used for targeting drugs in cancer therapies.