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• W2063592693 abstract "The dynamic and living characteristics of monolayers at the air-water interface of a cyclohexapeptide (C6G) and a cyclooctapeptide (C8G), both composed of glutamic acid and 3-aminobenzoic acid subunits in an alternating sequence, were investigated using the Langmuir balance technique, Brewster angle microscopy (BAM), and X-ray reflectivity (XR). An alanine-containing cyclohexapeptide (C6A) was included in this study for comparison. All three cyclopeptides preferentially adopt an orientation parallel to the subphase at low surface pressure. Continuous compression then causes the molecules to flip to a perpendicular state, thus minimizing their molecular area. In contrast to C8G and C6A, a pronounced hysteresis observed during the compression-expansion cycle of C6G indicates that strong intermolecular interactions between the cyclopeptide rings occur in the monolayers of this peptide. This result is supported by BAM measurements that show the formation of crystallite structures for C6G at high surface pressures, whereas no structures were observed for C8G and C6A. These results indicate that C6G is able to self-assemble upon surface compression, an ability that is obviously critically dependent on the correct ring size and composition of the peptide. The presence of hydrogen bond acceptors in the side chains of C6G suggests that the structural stabilization of the monolayer is due to H-bonding, possibly between ring NH groups and side chain CO groups. Our in situ study thus provides a detailed understanding of the molecular dynamics and uninterrupted interfacial behavior of the three peptides in a real-time frame." @default.
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• W2063592693 date "2005-06-01" @default.
• W2063592693 modified "2023-10-02" @default.
• W2063592693 title "X-ray reflectivity study of cyclic peptide monolayers at the air-water interface" @default.
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• W2063592693 doi "https://doi.org/10.1560/4qgd-xf09-a2r6-7np6" @default.
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