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@ARTICLE{Schulz:185728,
author = {Schulz, Anita and Jaksch, Sebastian and Schubel, Rene and
Wegener, Erik and Di, Zhenyu and Han, Yingchao and Meister,
Annette and Kressler, Jörg and Kabanov, Alexander V. and
Luxenhofer, Robert and Papadakis, Christine M. and Jordan,
Rainer},
title = {{D}rug-{I}nduced {M}orphology {S}witch in {D}rug {D}elivery
{S}ystems {B}ased on {P}oly(2-oxazoline)s},
journal = {ACS nano},
volume = {8},
number = {3},
issn = {1936-086X},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2014-07153},
pages = {2686 - 2696},
year = {2014},
abstract = {Defined aggregates of polymers such as polymeric micelles
are of great importance in the development of pharmaceutical
formulations. The amount of drug that can be formulated by a
drug delivery system is an important issue, and most drug
delivery systems suffer from their relatively low
drug-loading capacity. However, as the loading capacities
increase, i.e., promoted by good drug–polymer
interactions, the drug may affect the morphology and
stability of the micellar system. We investigated this
effect in a prominent system with very high capacity for
hydrophobic drugs and found extraordinary stability as well
as a profound morphology change upon incorporation of
paclitaxel into micelles of amphiphilic ABA
poly(2-oxazoline) triblock copolymers. The hydrophilic
blocks A comprised poly(2-methyl-2-oxazoline), while the
middle blocks B were either just barely hydrophobic
poly(2-n-butyl-2-oxazoline) or highly hydrophobic
poly(2-n-nonyl-2-oxazoline). The aggregation behavior of
both polymers and their formulations with varying paclitaxel
contents were investigated by means of dynamic light
scattering, atomic force microscopy, (cryogenic)
transmission electron microscopy, and small-angle neutron
scattering. While without drug, wormlike micelles were
present, after incorporation of small amounts of drugs only
spherical morphologies remained. Furthermore, the much more
hydrophobic poly(2-n-nonyl-2-oxazoline)-containing triblock
copolymer exhibited only half the capacity for paclitaxel
than the poly(2-n-butyl-2-oxazoline)-containing copolymer
along with a lower stability. In the latter, contents of
paclitaxel of 8 wt $\%$ or higher resulted in a
raspberry-like micellar core.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
ICS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS1-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000333539400084},
pubmed = {pmid:24548260},
doi = {10.1021/nn406388t},
url = {https://juser.fz-juelich.de/record/185728},
}