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Dembereldorj, Uuriintuya,Kim, Mira,Kim, Semi,Ganbold, Erdene-Ochir,Lee, So Yeong,Joo, Sang-Woo The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.45
<P>Both <I>in vitro</I> and <I>in vivo</I> glutathione (GSH)-triggered anticancer drug releases were monitored in real time from the PEGylated graphene oxide (PEG-GO) platform. The assembly of the anticancer drug doxorubicin (DOX) on PEG-GO was verified by UV-Vis absorption and infrared spectroscopic tools. The fluorescence of DOX appeared to be quenched significantly by PEG-GO. A part of the initial DOX (10<SUP>−4</SUP> M) in PEG-GO was found to be released by ∼23.5% after treatment with 2 mM glutathione (GSH) within 15 min. Our fluorescence colocalization experiments indicated that PEG-GO–DOX was endocytosed and localized in either lysosomes or endosomes of intracellular compartments. Using fluorescence imaging techniques in real time, we were able to observe an approximately 2.5 times higher <I>in vitro</I> drug release in the live cells by externally triggering glutathione ethyl ester (GSH-OEt) rather than endogeneous GSH. <I>In vivo</I> fluorescence images of DOX were obtained with an order of magnitude larger intensity from the subcutaneous site in living mice after treatment with 0.3 mg of GSH. A real-time release of DOX on PEG-GO at the intended locus can be achieved <I>in vivo</I> after an external triggering of GSH.</P> <P>Graphic Abstract</P><P>Real-time monitoring of glutathione (GSH)-induced anticancer drug release was achieved using the PEGylated graphene oxide (PEG-GO) platform both <I>in vitro</I> and <I>in vivo</I>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm34853e'> </P>
Uuriintuya Dembereldorj,주상우 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
Adsorption structures of the self-assembled thin films of α-cyano-4-hydroxycinnamic acid (CHCA) anchoring on TiO2surfaces have been studied by using temperature-dependent diffuse reflectance infrared Fourier-transform (DRIFT)spectroscopy. From the presence of the strong ν(COO−) band at ~1390 cm-1 along with the disappearance of the OH bands in the carboxylic acid group in the DRIFT spectra at room temperature, CHCA appeared to adsorb onto TiO2 surfaces as a carboxylate form. The absence of the out-of-plane benzene ring modes of CHCA in the DRIFT spectra suggests a rather vertical orientation of CHCA on TiO2. Above ~220 oC, CHCA seemed to start to thermally degrade on TiO2 surfaces referring from the disappearance of most vibrational modes in the DRIFT spectra, whereas the ν(C ≡ N) bands were found to remain relatively conspicuous as the temperature increased even up to ~460 C.
Dembereldorj, Uuriintuya,Joo, Sang-Woo Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
Adsorption structures of the self-assembled thin films of $\alpha$-cyano-4-hydroxycinnamic acid (CHCA) anchoring on $TiO_2$ surfaces have been studied by using temperature-dependent diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy. From the presence of the strong $\nu(COO^-)$ band at ~1390 $cm^{-1}$ along with the disappearance of the OH bands in the carboxylic acid group in the DRIFT spectra at room temperature, CHCA appeared to adsorb onto $TiO_2$ surfaces as a carboxylate form. The absence of the out-of-plane benzene ring modes of CHCA in the DRIFT spectra suggests a rather vertical orientation of CHCA on $TiO_2$. Above ~220$ ^{\circ}C$, CHCA seemed to start to thermally degrade on $TiO_2$ surfaces referring from the disappearance of most vibrational modes in the DRIFT spectra, whereas the $\nu$(C ≡ N) bands were found to remain relatively conspicuous as the temperature increased even up to ~460$^{\circ}C$.
Hydrogen bonding-induced color recovery of gold nanoparticles upon conjugation of amino acids
Park, Jin-Ho,Ganbold, Erdene Ochir,Uuriintuya, Dembereldorj,Lee, Kangtaek,Joo, Sang-Woo The Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.47
<p>Hydrogen bonding-induced redispersion of the aggregated Au nanoparticles upon <I>N</I>-hydroxysuccinimide ester bioconjugations may provide a simple and colorimetric tool as an optical sensor to detect a trace amount of amino acids as low as ∼10<SUP>−6</SUP> M in an aqueous solution.</p> <P>Graphic Abstract</P><P>Redispersion of the aggregated Au nanoparticles induced by hydrogen bonding between the amide linkages may provide a useful optical sensor of the amino acid bioconjugations. <img src='http://pubs.rsc.org/ej/CC/2009/b918687e/b918687e-ga.gif'> </P>