Abstract:
:The availability of a real-time assay to experimentally investigate the release of encapsulated proteins would be beneficial given the interest in the use of liposomes as a drug delivery vehicle. Although simple assays for small molecular weight substances exist, assays to evaluate macromolecules do not. Here we describe a method that detects the release of model macromolecules from liposomes in real time. The assay employs the intermolecular distance-dependent phenomenon of fluorescence resonance energy transfer (FRET) between the fluorophore donor, fluorescein (FITC), and fluorescent quencher, QSY® 9. The macromolecular species were conjugated to the markers fluorescein (44kDa dextran) and QSY® 9 (67 kDa bovine serum albumin, BSA). Following confirmation of quenching between FITC-Dex and QSY® 9-BSA, liposomes were loaded with the macromolecular markers and subjected to various treatments (high-pressure extrusion and Triton X solubilisation) to cause release from liposomes. An increase in FITC fluorescence was observed when liposomes were subjected to extrusion cycles. Surprisingly, the addition of Triton X did not cause an increase in fluorescence probably because the FRET pair became associated with mixed micelles. This assay method should be useful in studies to investigate the mechanisms by which macromolecules are released from liposomes, particularly when liposomes are exposed to release-triggers (eg, temperature change, pH change, ultrasound). Such understanding will underpin the formulation of triggered liposomal delivery systems for macromolecules.
journal_name
Drug Test Analjournal_title
Drug testing and analysisauthors
Mujoo H,Reynolds JNJ,Tucker IGdoi
10.1002/dta.2332subject
Has Abstractpub_date
2018-06-01 00:00:00pages
1025-1032issue
6eissn
1942-7603issn
1942-7611journal_volume
10pub_type
杂志文章abstract::The accuracy in predicting different chemometric methods was compared when applied on ordinary UV spectra and first order derivative spectra. Principal component regression (PCR) and partial least squares with one dependent variable (PLS1) and two dependent variables (PLS2) were applied on spectral data of pharmaceuti...
journal_title:Drug testing and analysis
pub_type: 杂志文章
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abstract::Workplace drug testing in Europe is governed by a patchwork of legislation--or lack of it. Other difficulties are caused by language, currency and a host of other factors, including the difficulty in defining 'safety critical'. The European Workplace Drug Testing Society's (EWDTS) history and objectives are briefly ou...
journal_title:Drug testing and analysis
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pub_type: 杂志文章,评审
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2668
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journal_title:Drug testing and analysis
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journal_title:Drug testing and analysis
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2101
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2111
更新日期:2017-07-01 00:00:00
abstract::Standard treatment of poisoning by organophosphorus (OP) nerve agents with atropine and oximes lacks efficacy with some nerve agents. Promising in vitro and in vivo results were obtained with the bispyridinium compound SAD-128 which was partly attributed to its interaction with nicotinic acetylcholine receptors. Previ...
journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.410
更新日期:2012-03-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
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更新日期:2019-09-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2656
更新日期:2019-09-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.20
更新日期:2009-02-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.1453
更新日期:2013-05-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2352
更新日期:2018-05-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2191
更新日期:2017-09-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.2219
更新日期:2018-02-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.1753
更新日期:2015-08-01 00:00:00
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journal_title:Drug testing and analysis
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doi:10.1002/dta.2726
更新日期:2020-03-01 00:00:00
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journal_title:Drug testing and analysis
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doi:10.1002/dta.270
更新日期:2011-05-01 00:00:00
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pub_type: 杂志文章
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更新日期:2017-03-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.1468
更新日期:2014-07-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.1748
更新日期:2015-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:2021-01-04 00:00:00
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更新日期:2017-06-01 00:00:00
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journal_title:Drug testing and analysis
pub_type: 杂志文章
doi:10.1002/dta.1608
更新日期:2014-10-01 00:00:00
abstract::The tiletamine-zolazepam (TZ) combination is an anaesthetic drug commonly used in veterinary medicine. It is an equal amount combination of tiletamine, a dissociative anaesthetic pharmacologically classified as an N-methyl-D-aspartate (NMDA) receptor antagonist, and zolazepam, a benzodiazepine tranquilizer. There are ...
journal_title:Drug testing and analysis
pub_type: 杂志文章,评审
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更新日期:2016-08-01 00:00:00