Linked Life Data

11018557

Source:http://linkedlifedata.com/resource/pubmed/id/11018557

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2000-12-13
pubmed:abstractText
The objective of this study was to encapsulate an oligonucleotide drug within poly(lactide) microparticles with high encapsulation efficiencies at high theoretical drug loadings by the solvent evaporation method. With the conventional W/O/W method, the encapsulation efficiency decreased with increasing internal water content, increasing stirring time prior to filtration of the microparticles and increasing drug loading. The encapsulation was improved by replacing methylene chloride with ethyl acetate, by using micronized drug powder instead of an internal aqueous phase or by adding electrolytes or nonelectrolytes to the external phase. With ethyl acetate, a pre-emulsification step into a smaller volume of external aqueous phase was necessary in order to avoid premature polymer precipitation and to obtain microparticles. The addition of salts (NaCl or MgCl(2)) or sorbitol to the external aqueous phase significantly improved the encapsulation efficiency, even at high theoretical drug loadings. The microparticles had a denser structure with a smooth, pore-free surface.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0168-3659
pubmed:author
pubmed:issnType
Print
pubmed:day
3
pubmed:volume
69
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
197-207
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Improvement of the encapsulation efficiency of oligonucleotide-containing biodegradable microspheres.
pubmed:affiliation
College of Pharmacy, Freie Universität Berlin, Kelchstrasse 31, 12169 Berlin, Germany.
pubmed:publicationType
Journal Article