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Cui, Chunzhi,Kim, Seokho,Ahn, Dong June,Joo, Jinsoo,Lee, Gil Sun,Park, Dong Hyuk,Kim, Bo-Hyun Elsevier 2018 Synthetic metals Vol.236 No.-
<P><B>Abstract</B></P> <P>The colorimetric and fluorescent properties of polydiacetylene (PDA) have been assessed for chemosensors and ultrafast biosensor applications. The low quantum efficiency, however, has delayed the further development of PDA based practical devices. Here, we synthesized a hybrid nanostructure of PDA with Ag nanoparticles of core. A core-shell type Ag@PDA blue phase nanoparticles showed significantly enhanced Raman scattering, whereas it dramatically decreased after the thermal treatment inducing phase transition of PDA to red. On the other hand the Ag@PDA red phase nanoparticles showed an evidently increasing fluorescence accompanying with the shortened lifetime. These unusual reinforced optical properties is attributed to the core Ag nanoparticles providing the surface selection rule and the surface enhancement effects by the localized surface plasmon. Consequently, our result demonstrates the hybrid structure of PDA with metal nanoparticles to be an alternative to overcome the limit of PDA for high performance devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A significantly enhanced Raman scattering was observed in a core-shell type Ag@ polydiacetylene (PDA) blue-phase nanoparticle (NP). </LI> <LI> The Raman scattering was decreased dramatically while the PDA shell of Ag@PDA NP undertook a phase transition to a fluorescent red phase. </LI> <LI> The fluorescence of PDA shell of the Ag@PDA red-phase NP was enhanced 7-fold in the intensity compared with the PDA red-phase NP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Oligonucleotide assisted light-emitting Alq3 microrods: energy transfer effect with fluorescent dyes
Cui, Chunzhi,Park, Dong Hyuk,Kim, Jeongyong,Joo, Jinsoo,Ahn, Dong June The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.47
<P>Oligonucleotide assisted tri(8-hydroxyquinoline) aluminium (Alq3) microrods were prepared for the first time. When hybridized with oligonucleotide labeled by Cy3 fluorescent dye, a significant photoluminescence variation of the Alq3 microrods was observed due to Förster resonance energy transfer, unlike when Cy5-oligonucleotide was used. Versatile nucleotide manipulation would open up wider applications of Alq3-based materials, based on this fundamental observation.</P> <P>Graphic Abstract</P><P>Oligonucleotide assisted tri(8-hydroxyquinoline) aluminium (Alq3) microrods were prepared for the first time. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc41255e'> </P>
ATP Recognition Based on the FRET from Organic Semiconducting Molecules to Cy3 Fluorophores
Jingyuan Huang,Chunzhi Cui,안동준 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Adenosine triphosphate as a major source of chemical energy in living organisms can drive many processes in living cells. In the previous researches, ATP recognition is playing a critical part in cell biology and clinical diagnostics. However, traditional methods, such as chromatographic, electrochemical and bio luminometric approaches are time-consuming and involved in complex chemical or enzymatic reactions. In this research, hybrid-assemblies has been fabricated which composed of double strands DNA and organic semiconducting tri (8-hydroxyquinoline) aluminium (Alq3) molecules. One of the single-strand DNA molecules which labeled with the Cy3 fluorophore can specifically recognize ATP as an aptamer. Under this condition, FFrster resonance energy transfer (FRET) from Alq3 to Cy3 can be observed. However, after adding ATP, owing to strong affinity with ATP, Cy3 labeled aptamer release from the hybrid-assemblies that induced the decreasing of FRET.
Kim, Sung Bong,Cui, Chunzhi,Lee, Ja Hyun,Lee, Sang Jun,Ahn, Dong June,Park, Chulhwan,Kim, Jun Seok,Kim, Seung Wook Elsevier 2013 Bioresource technology Vol.146 No.-
<P><B>Abstract</B></P> <P>The fluorescence intensities (FIs) of raw and pretreated barley straws were measured by fluorescence microscopy, and the difference in the fluorescence intensity of barley straw before and after dilute acid pretreatment was analyzed by investigation of the major compounds of barley straw. The difference in fluorescence intensity was due to the difference in xylan content. Barley straw was pretreated using dilute sulfuric acid at various conditions and the correlation between the fluorescence intensity and glucose yield of barley straw was investigated. The coefficient of determination (<I>R</I> <SUP>2</SUP>) of the correlation was found to be 72.28%. Also the calibration of fluorescence intensity with the xylan content was performed. In addition, the absorption and emission spectra of the raw and the pretreated barley straw were examined to verify the proposed method. The absorption and emission wave lengths were 550nm and 665nm, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> FI of pretreated barley straw was proportional to xylan content. </LI> <LI> The FI test could evaluate the effect of pretreatment on the barley straw. </LI> <LI> Photoluminescence analysis of biomass was rapid and effective. </LI> </UL> </P>
Theoretical insights into the mechanism of acetylcholinesterase-catalyzed acylation of acetylcholine
Manojkumar, T. K.,Cui, Chunzhi,Kim, Kwang S. Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of computational chemistry Vol.26 No.6
<P>Acylation of acetylcholine (ACh) catalyzed by acetylcholinesterase (AChE) has been studied using high-level theoretical calculations on a model system that mimics the reaction center of the enzyme, and compared with uncatalyzed acylation reaction. The geometries of all the intermediates and transition states, activation energies, and solvent effects have been calculated. The calculations predict simultaneous formation of two short-strong hydrogen bonds (SSHB) in the rate-determining transition state structures [the first SSHB involves the hydrogen atom of Ser-200 (H<SUB>s</SUB>) and another involves the hydrogen atom of His-440 (H<SUB>h</SUB>)]. In the intermediate states, the H-bond corresponding to H<SUB>h</SUB> involves SSHB, whereas the one corresponding to H<SUB>s</SUB> does not. © 2005 Wiley Periodicals, Inc. J Comput Chem 26: 606–611, 2005</P> <B>Graphic Abstract</B> <img src='wiley_img/01928651-2005-26-6-JCC20199-gra001.gif' alt='wiley_img/01928651-2005-26-6-JCC20199-gra001'>