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Ryu, Jungki,Park, Chan Beum Wiley Subscription Services, Inc., A Wiley Company 2010 Biotechnology and bioengineering Vol.105 No.2
<P>Understanding the self-assembly of peptides into ordered nanostructures is recently getting much attention since it can provide an alternative route for fabricating novel bio-inspired materials. In order to realize the potential of the peptide-based nanofabrication technology, however, more information is needed regarding the integrity or stability of peptide nanostructures under the process conditions encountered in their applications. In this study, we investigated the stability of self-assembled peptide nanowires (PNWs) and nanotubes (PNTs) against thermal, chemical, proteolytic attacks, and their conformational changes upon heat treatment. PNWs and PNTs were grown by the self-assembly of diphenylalanine (Phe–Phe), a peptide building block, on solid substrates at different chemical atmospheres and temperatures. The incubation of diphenylalanine under aniline vapor at 150°C led to the formation of PNWs, while its incubation with water vapor at 25°C produced PNTs. We analyzed the stability of peptide nanostructures using multiple tools, such as electron microscopy, thermal analysis tools, circular dichroism, and Fourier-transform infrared spectroscopy. Our results show that PNWs are highly stable up to 200°C and remain unchanged when incubated in aqueous solutions (from pH 1 to 14) or in various chemical solvents (from polar to non-polar). In contrast, PNTs started to disintegrate even at 100°C and underwent a conformational change at an elevated temperature. When we further studied their resistance to a proteolytic environment, we discovered that PNWs kept their initial structure while PNTs fully disintegrated. We found that the high stability of PNWs originates from their predominant β-sheet conformation and the conformational change of diphenylalanine nanostructures. Our study suggests that self-assembled PNWs are suitable for future nano-scale applications requiring harsh processing conditions. Biotechnol. Bioeng. 2010; 105: 221–230. © 2009 Wiley Periodicals, Inc.</P>
Synthesis of Diphenylalanine/Polyaniline Core/Shell Conducting Nanowires by Peptide Self-Assembly
Ryu, Jungki,Park, Chan Beum WILEY-VCH Verlag 2009 Angewandte Chemie Vol.48 No.26
<P>Breaking the mold: Self-assembled peptide nanowires were used as a template for the synthesis of hollow polyaniline (PANI) nanotubes (see scanning electron microscopy images). The thickness and the morphology of the PANI nanostructures could be controlled readily either by varying the reaction time or by applying multiple PANI coatings. <img src='wiley_img/14337851-2009-48-26-ANIE200900668-content.gif' alt='wiley_img/14337851-2009-48-26-ANIE200900668-content'> </P> <B>Graphic Abstract</B> <P>Breaking the mold: Self-assembled peptide nanowires were used as a template for the synthesis of hollow polyaniline (PANI) nanotubes (see scanning electron microscopy images). The thickness and the morphology of the PANI nanostructures could be controlled readily either by varying the reaction time or by applying multiple PANI coatings. <img src='wiley_img/14337851-2009-48-26-ANIE200900668-content.gif' alt='wiley_img/14337851-2009-48-26-ANIE200900668-content'> </P>
Photoluminescent Peptide Nanotubes
Ryu, Jungki,Lim, Seong Yoon,Park, Chan Beum WILEY-VCH Verlag 2009 Advanced Materials Vol.21 No.16
<B>Graphic Abstract</B> <P>Photoluminescent peptide nanotubes are synthesized in an in situ incorporation of lanthanide complexes into peptide nanotubes through a self-assembly process. We found that peptide nanotubes and photosensitizer molecules exhibited a high synergistic effect on the enhancement of lanthanide photoluminescence through a cascaded energy-transfer mechanism. <img src='wiley_img/09359648-2009-21-16-ADMA200802700-content.gif' alt='wiley_img/09359648-2009-21-16-ADMA200802700-content'> </P>
Mineralization of Self‐assembled Peptide Nanofibers for Rechargeable Lithium Ion Batteries
Ryu, Jungki,Kim, Sung‐,Wook,Kang, Kisuk,Park, Chan Beum WILEY‐VCH Verlag 2010 Advanced Materials Vol.22 No.48
<P><B>Peptide Self‐Assembly for Lithium Ion Batteries:</B> Nanostructures of transition metal phosphates were fabricated through biomimetic mineralization of self‐assembled peptide hydrogel nanofibers. FePO<SUB>4</SUB>‐mineralized peptide nanofibers were readily converted to carbon‐coated FePO<SUB>4</SUB> nanotubes after heat treatment and exhibited a high and reversible charge/discharge capacity as Lithium ion battery cathodes. </P>