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Azobenzene-based Photo Controllable Drug Release LBL Multilayers

資料類型：

PDF文件

關(guān)鍵詞：

azobenzene cyclodextrin host-guest interaction lbl photo controllable
drug release

資料大小：

102K

所屬學(xué)科：

分子表征

來源：

第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）

簡(jiǎn)介：

Inthisstudy,host-guestinteractionisusedasthedrivingforcetofabricatetwooppositechargedAzobenzene(Azo)/a-CD-rhodamineB(a-CD-RhB)inclusioncomplexes.TheelectrostaticinteractionandhydrogenbondingbetweenthetwoAzopolyelectrolytesareusedtobuildLBLmultilayers,andtheloadingandreleaseprocessesdrivenbythephoto-switchablehost-guestinteractionhavebeenprovedbyUV-visibleabsorptionspectroscopy.Thetrans-cisphotoisomerizationisthebasisofphotoresponsivesystemsformanyAzofunctionalmaterials,anditisalsoappliedtoconstructphoto-switchinthiscase.TwoopticallyactiveAzopolyelectrolytesaredesigned,includingPoly{2-[4-(4‘-ethoxyphenylazo)phenoxy]hexylacrylate-co-acrylamide}(P(EAPHA-co-AAm》andPoly{2-[4-(4‘-ethoxyphenylazo)phenoxy]hexylacrylate-co-acrylicacid}(P(EAPHA-co-AA》,anda-CDmodifiedthodamineB(a-CD-RhB),andarechosenasfluorescenceindicatortoformtwooppositechargedAzo/a-CD-RhBinclusioncomplexes.ByalternatelydippingasubstrateintoaqueoussolutionsofP(EAPHA-co-AA)/a-CD-RhBandP(EAPHA-co-AAm)/a-CD-RhB,thedye-loadedLBLmultilayerscouldbeobtained.Generally,theapparentchangeofAzocompoundduringitstranscisphotoisomerizationisthelongitudinalandaxialmolecularsize.Duetospacematching,a-CDisveryeasytoidentifyandincludestransAzocompoundcl‘2].After20minutesofUVlightirradiation,accompanyingtheisomerizationofazobenzenechromophoresfromtranstocis,theabsorptionbandataround566nmcorrespondingtoa-CD-RhBalmostdisappears.Theresultsrevealtherapidreleaseofloadeda-CD-RhBmodeldrugfromthemultilayers.Possessingthegoodcontrolofboththefilmthicknessandinnerstructure,thisuniquefabricationmethodcouldbepromisingincontrollingthedrugloadingamountandreleaserate.

作者：

J. Wang,J. Li,Y. P Cao

上傳時(shí)間：

2013-07-03 14:24:41

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