Linked Life Data

16413761

Source:http://linkedlifedata.com/resource/pubmed/id/16413761

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2006-1-30
pubmed:abstractText
Detailed knowledge based on new developments, especially in analytical techniques, is needed for characterizing polymer excipients. Inverse gas chromatography (IGC) is a useful method for investigating polymer surfaces in terms of thermodynamic parameters. The aim of our work was to study the correlation between polymer surface properties determined with IGC and the mechanisms of release of water-soluble pentoxifylline and vancomycin hydrochloride from cellulose ether matrices. Tablets were made of hydroxypropyl (HPC), hydroxyethyl (HEC) or hydroxypropylmethyl (HPMC) cellulose and contained 25% of drug. Differences in dispersive component of the surface free energy for these polymers were relatively small and ranged from 26 to 33mN/m. However, polar properties, expressed as specific component of the enthalpy of adsorption and as acid-base properties show larger differences between the polymers and demonstrate their relative polarity in the order HEC>HPMC>HPC, which correlates well with water sorption on bulky polymers and with the swelling degree of polymer matrices. The release of pentoxifylline and vancomycin from HPC is governed mainly by Fickian diffusion, whereas from HEC the relaxation of polymer chains is important too. The analysis of the release profiles in the light of Peppas-Sahlin model lead to the conclusion that the surface properties of the cellulose ethers influence the interactions with water and the release mechanisms of the drug. It was found out, that data obtained by IGC enable rapid inference about the behaviour of polymers in water and the release of water-soluble drugs.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0928-0987
pubmed:author
pubmed:issnType
Print
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
375-83
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Analysis of surface properties of cellulose ethers and drug release from their matrix tablets.
pubmed:affiliation
University of Ljubljana, Faculty of Pharmacy, Askerceva 7, SI-1000 Ljubljana, Slovenia.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't