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Erdene-Ochir Ganbold,Jin-Ho Park,Kwang-Su Ock,주상우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
We studied the detection of the Hg(II) concentration in an aqueous solution using rhodamine dyes on citrate-reduced Au nanoparticles (NPs). The quenching effect from Au NPs was found to decrease as the Hg(II) concentration increased under our experimental conditions. As the fluorescence signals intensified, the surface-enhanced Raman scattering (SERS) intensities reduced on the contrary due to less rhodamine dyes on Au NPs as the Hg(II) concentration increased. The rhodamine 6G (Rh6G) and rhodamine 123 (Rh123) dyes were examined via fluorescence and SERS measurements depending on Hg(II) concentrations. Fast and easy fluorescence detection of an Hg (II) concentration as low as a few ppm could be achieved by naked eye using citrate-reduced Au NPs.
Ganbold, Erdene-Ochir,Park, Jin-Ho,Ock, Kwang-Su,Joo, Sang-Woo Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
We studied the detection of the Hg(II) concentration in an aqueous solution using rhodamine dyes on citrate-reduced Au nanoparticles (NPs). The quenching effect from Au NPs was found to decrease as the Hg(II) concentration increased under our experimental conditions. As the fluorescence signals intensified, the surface-enhanced Raman scattering (SERS) intensities reduced on the contrary due to less rhodamine dyes on Au NPs as the Hg(II) concentration increased. The rhodamine 6G (Rh6G) and rhodamine 123 (Rh123) dyes were examined via fluorescence and SERS measurements depending on Hg(II) concentrations. Fast and easy fluorescence detection of an Hg (II) concentration as low as a few ppm could be achieved by naked eye using citrate-reduced Au NPs.
Raman Spectroscopy of Biphenyl-4,4'-dithiol and p-Terphenyl-4,4″-dithiol on Gold Surfaces#
Erdene Ochir Ganbold,주상우 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3
We compared the adsorption behaviors of 1,4-benzenedithiol (BDT), biphenyl-4,4′-dithiol (BPDT), and p-terphenyl-4,4″-dithiol (TPDT) on gold (Au) surfaces. To check the surface orientations and possibility of multilayer formation, surface-enhanced Raman scattering was employed for the three aromatic dithiols on gold nanoparticles (AuNPs). The Raman spectra of BDT and BPDT on AuNPs were examined, whereas those of TPDT could be obtained on an Au-coated nanostructured silicon plate. Unlike BDT, BPDT and TPDT did not exhibit a ν(S–H) band at 2560 cm−1. Because of the additional benzene rings, multilayer formation is improbable for BPDT and TPDT under colloidal conditions.
PEGylation density-modulated anticancer drug release on gold nanoparticles in live cells
윤진하,Erdene Ochir Ganbold,주상우 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Glutathione (GSH)-triggered drug releases of the anticancer drug mitoxantrone from a polyethyleneglycol (PEG) (molecular weight: 5000) density-modulated drug delivery system up to 0.57 nm 2 of goldnanoparticles (AuNPs) were examined using bimodal spectroscopic imaging techniques of live-cellfluorescence imaging and surface-enhanced resonance Raman scattering (SERRS). Prolonged deliveryamounts and sustained drug releases after introducing a high PEG density on AuNPs was supported by acell viability test in HeLa cells. A subcutaneous in vivo test also indicated that the SERRS spectra could beobserved only for the PEGylated AuNPs after external GSH treatment in consistent with the fluorescencemeasurements.
Ock, Kwang-Su,Ganbold, Erdene-Ochir,Jeong, Sae-Ro-Mi,Seo, Ji-Hye,Joo, Sang-Woo Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.10
CdS nanoparticles (NPs) were synthesized in an aqueous phase in order to investigate their spectral behaviors as efficient fluorescence resonance energy transfer (FRET) donors for various organic dye acceptors. Our prepared CdS NPs exhibiting strong and broad emission spectra between 480-520 nm were able to transfer energy in a wide wavelength region from green to red fluorescence dyes. Rhodamine 6G (Rh6G), rhodamine B (RhB), and sulforhodamine 101 acid (Texas red) were tested as acceptors of the energy transfer from the CdS NPs. The three dyes and synthesized CdS NPs exhibited good FRET behaviors as acceptors and donors, respectively. Energy transfers from the CdS NPs and organic Cy3 dye were compared to the same acceptor Texas red dye at different concentrations. Our prepared CdS NPs appeared to exhibit better FRET behaviors comparable to those of the Cy3 dye. These CdS NPs in an aqueous solution may be efficient FRET donors for various organic dyes in a wide wavelength range between green and red colors.
Ock, Kwang-Su,Ganbold, Erdene Ochir,Park, Jin,Cho, Keunchang,Joo, Sang-Woo,Lee, So Yeong The Royal Society of Chemistry 2012 The Analyst Vol.137 No.12
<P>We investigated glutathione (GSH)-induced purine or pyrimidine anticancer drug release on gold nanoparticle (AuNP) surfaces by means of label-free Raman spectroscopy. GSH-triggered releases of 6-thioguanine (6TG), gemcitabine (GEM), acycloguanosine (ACY), and fadrozole (FAD) were examined in a comparative way by means of surface-enhanced Raman scattering (SERS). The GSH-induced dissociation constant of GEM (or ACY/FAD) from AuNPs was estimated to be larger by more than 38 times than that of 6TG from the kinetic relationship. Tripeptide control experiments were presented to check the turn-off Raman signalling mechanism. Dark-field microscopy (DFM) and transmission electron microscopy (TEM) indicated the intracellular AuNP loads. After their cellular uptake, GEM, ACY, and FAD would not show SERS intensities as strong as 6TG. This may be due to easier release of GEM, ACY, and FAD than 6TG by intracellular reducing species including GSH. We observed fairly strong SERS signals of GEM and 6TG in cell culture media solution. Our CCK-8 cytotoxicity assay data support that 6TG–AuNPs did not exhibit a substantial decrease in cell viability presumably due to strong binding. Label-free confocal Raman spectroscopy can be utilized as an effective tool to access intracellular anticancer drug release.</P> <P>Graphic Abstract</P><P>We investigated glutathione (GSH)-induced purine or pyrimidine anticancer drug release on gold nanoparticle (AuNP) surfaces by means of label-free Raman spectroscopy. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an35170f'> </P>