PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 7931936

Study on polyamide microcapsules containing oily liquids.

N Yan·M Zhang·P Ni
View original source ↗Export metadata ↓

Abstract

Oily liquids were microencapsulated within polyphthalamide membranes with dodecyl sulphonate sodium (DSS) as an emulsifier. The mean diameter and the distribution, as well as the zeta-potential, of the microcapsules were analysed. It was found that the mean diameter decreases with an increase in stirring speed and emulsifier concentration during the emulsification step. The addition of DSS to aqueous phase resulted in a decrease in zeta-potential of the microcapsules.

Explore related subjects

CapsulesDrug CompoundingElectrophoresisExcipientsMembranes, ArtificialNylonsOilsParticle SizeSodium Dodecyl SulfateSurface PropertiesSurface-Active AgentsTemperatureJournal ArticleResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

N Yan, M Zhang, P Ni. Study on polyamide microcapsules containing oily liquids.. https://doi.org/10.3109/02652049409034254

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Successful transfection of hepatoma cells after encapsulation of plasmid DNA into negatively charged liposomes.

The application of conventional cationic liposomes/DNA complexes in gene transfer was hampered due to their large size, instability, and limited transfection site in vivo. In this report, we described a dialysis-based method and produced small, stable, and negatively charged DNA-containing liposomes composed of low content of cationic lipid and high content of fusogenic lipid. The liposomes were relatively spherical with a condensed core inside, and exhibited small size with narrow particle size distribution. The encapsulation efficiency of the liposomes was 42.53 +/- 2.29%. They were stable and showed enough protective ability to plasmid DNA from degradation after incubation with different amounts of DNase. Twenty-fold higher transfection efficiency for the liposomes was achieved when compared with that of naked plasmid DNA and no toxicities to hepatocellular carcinoma cells were observed. Our results indicate that the negatively charged DNA-containing liposomes can facilitate gene transfer in cultured cells, and may alleviate the drawbacks of the conventional cationic liposomes/DNA complexes for gene delivery in vivo.

Capsules↗
PubMed2007

Analysis of coating structures and interfaces in solid oral dosage forms by three dimensional terahertz pulsed imaging.

Three dimensional terahertz pulsed imaging (TPI) was evaluated as a novel tool for the nondestructive characterization of different solid oral dosage forms. The time-domain reflection signal of coherent pulsed light in the far infrared was used to investigate film-coated tablets, sugar-coated tablets, multilayered controlled release tablets, and soft gelatin capsules. It is possible to determine the spatial and statistical distribution of coating thickness in single and multiple coated products using 3D TPI. The measurements are nondestructive even for layers buried underneath other coating structures. The internal structure of coating materials can be analyzed. As the terahertz signal penetrates up to 3 mm into the dosage form interfaces between layers in multilayered tablets can be investigated. In soft gelatin capsules it is possible to measure the thickness of the gelatin layer and to characterize the seal between the gelatin layers for quality control. TPI is a unique approach for the nondestructive characterization and quality control of solid dosage forms. The measurements are fast and fully automated with the potential for much wider application of the technique in the process analytical technology scheme.

Capsules↗