dc.contributor.author |
Zhang, Wenli |
en |
dc.contributor.author |
Falconer, James R |
en |
dc.contributor.author |
Baguley, Bruce |
en |
dc.contributor.author |
Shaw, John |
en |
dc.contributor.author |
Kanamala, Manju |
en |
dc.contributor.author |
Xu, Hongtao |
en |
dc.contributor.author |
Wang, Guangji |
en |
dc.contributor.author |
Liu, Jianping |
en |
dc.contributor.author |
Wu, Zimei |
en |
dc.date.accessioned |
2018-11-13T03:06:33Z |
en |
dc.date.issued |
2016-05 |
en |
dc.identifier.issn |
0378-5173 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/44173 |
en |
dc.description.abstract |
This paper describes a novel method to improve drug retention in liposomes for the poorly water-soluble (lipophilic) model drug asulacrine (ASL). ASL was loaded in the aqueous phase of liposomes and the effects of aging conditions and drug loading levels on drug retention were investigated using an in vitro bio-relevant drug release test established in this study. The status of intra-liposomal drug was investigated using differential scanning calorimetry (DSC) and cryo-transmission electron microscopy (cryo-TEM). Pharmacokinetics and venous tolerance of the formulations were simultaneously studied in rabbits following one-hour intravenous infusion via the ear vein. The presence of glucose during aging was found to be crucial to accelerate drug precipitation and to stabilize the liposomal membrane with high drug loading (8.9% over 4.5% w/w) as a prerequisite. Although no drug crystals were detected, DSC showed a lower phase-transition peak in the glucose-assisted aged ASL-liposomes, indicating interaction of phospholipids with the sugar. Cryo-TEM revealed more 'coffee bean' like drug precipitate in the ASL-liposomes aged in the glucose solution. In rabbits, these liposomes gave rise to a 1.9 times longer half-life than the fresh liposomes, with no venous irritation observed. Inducing and stabilizing drug precipitation in the liposome cores by aging in the presence of sugar provided an easy approach to improve drug retention in liposomes. The study also highlighted the importance of bio-relevance of in vitro release methods to predict in vivo drug release. |
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dc.format.medium |
Print-Electronic |
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dc.language |
eng |
en |
dc.relation.ispartofseries |
International journal of pharmaceutics |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.subject |
Animals |
en |
dc.subject |
Rabbits |
en |
dc.subject |
Amsacrine |
en |
dc.subject |
Glucose |
en |
dc.subject |
Antineoplastic Agents |
en |
dc.subject |
Liposomes |
en |
dc.subject |
Microscopy, Electron, Transmission |
en |
dc.subject |
Calorimetry, Differential Scanning |
en |
dc.subject |
Infusions, Intravenous |
en |
dc.subject |
Chemistry, Pharmaceutical |
en |
dc.subject |
Phase Transition |
en |
dc.subject |
Solubility |
en |
dc.subject |
Half-Life |
en |
dc.subject |
Chemical Precipitation |
en |
dc.subject |
Drug Liberation |
en |
dc.title |
Improving drug retention in liposomes by aging with the aid of glucose. |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1016/j.ijpharm.2016.03.044 |
en |
pubs.issue |
1-2 |
en |
pubs.begin-page |
194 |
en |
pubs.volume |
505 |
en |
dc.rights.holder |
Copyright: The author |
en |
dc.identifier.pmid |
27021465 |
en |
pubs.end-page |
203 |
en |
pubs.publication-status |
Published |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Comparative Study |
en |
pubs.subtype |
Journal Article |
en |
pubs.elements-id |
525637 |
en |
pubs.org-id |
Medical and Health Sciences |
en |
pubs.org-id |
Pharmacy |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
Science Research |
en |
pubs.org-id |
Maurice Wilkins Centre (2010-2014) |
en |
dc.identifier.eissn |
1873-3476 |
en |
pubs.record-created-at-source-date |
2016-05-09 |
en |
pubs.dimensions-id |
27021465 |
en |