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Hong, Daewha,Kang, Kyungtae,Hong, Seok-Pyo,Shon, Hyun Kyong,Son, Jin Gyeong,Lee, Tae Geol,Choi, Insung S. American Chemical Society 2012 Langmuir Vol.28 No.1
<P>In this paper, carbamate-based self-assembled monolayers (SAMs) of alkanethiolates on gold were suggested as a versatile platform for release of amine-bearing molecules in response to the electrical signal. The designed SAMs underwent the electrochemical oxidation on the gold surface with simultaneous release of the amine molecules. The synthesis of the thiol compounds was achieved by coupling isocyanate-containing compounds with hydroquinone. The electroactive thiol was mixed with 11-mercaptoundecanol [HS(CH<SUB>2</SUB>)<SUB>11</SUB>OH] to form a mixed monolayer, and cyclic votammetry was used for the characterization of the release behaviors. The mixed SAMs showed a first oxidation peak at +540 mV (versus Ag/AgCl reference electrode), indicating the irreversible conversion from carbamate to hydroquinone groups with simultaneous release of the amine molecules. The analysis of ToF-SIMS further indicated that the electrochemical reaction on the gold surface successfully released amine molecules.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-1/la203420h/production/images/medium/la-2011-03420h_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la203420h'>ACS Electronic Supporting Info</A></P>
Organic/inorganic double-layered shells for multiple cytoprotection of individual living cells
Hong, Daewha,Lee, Hojae,Ko, Eun Hyea,Lee, Juno,Cho, Hyeoncheol,Park, Matthew,Yang, Sung Ho,Choi, Insung S. Royal Society of Chemistry 2015 Chemical science Vol.6 No.1
<▼1><P><I>S. cerevisiae</I> encapsulated with a poly(norepinephrine)/silica double-layered shell showed multiple resistance to enzymatic attack, desiccation, and UV-C irradiation. The biochemical response of the encapsulated yeast may also contribute to the UV-C resistance.</P></▼1><▼2><P>The cytoprotection of individual living cells under <I>in vitro</I> and daily-life conditions is a prerequisite for various cell-based applications including cell therapy, cell-based sensors, regenerative medicine, and even the food industry. In this work, we use a cytocompatible two-step process to encapsulate <I>Saccharomyces cerevisiae</I> in a highly uniform nanometric (<100 nm) shell composed of organic poly(norepinephrine) and inorganic silica layers. The resulting cell-in-shell structure acquires multiple resistance against lytic enzyme, desiccation, and UV-C irradiation. In addition to the UV-C filtering effect of the double-layered shell, the biochemical responses of the encapsulated yeast are suggested to contribute to the observed UV-C tolerance. This work offers a chemical tool for cytoprotecting individual living cells under multiple stresses and also for studying biochemical behavior at the cellular level.</P></▼2>
Mussel-inspired, perfluorinated polydopamine for self-cleaning coating on various substrates
Hong, Daewha,Bae, KiEun,Hong, Seok-Pyo,Park, Ji Hun,Choi, Insung S.,Cho, Woo Kyung The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.79
<P>We designed a perfluorinated dopamine derivative, which, upon oxidative polymerization, formed a structurally rough film of extremely low surface energy on various substrates. The static water contact angles larger than 150° and the low water sliding angles less than 7° confirmed the formation of superhydrophobic, self-cleaning surfaces.</P> <P>Graphic Abstract</P><P>Substrate-independent coating for self-cleaning, superhydrophobic surfaces was achieved by oxidative polymerization of a mussel-inspired dopamine derivative (<I>f</I>-DOPA). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02775b'> </P>