Tip-enhanced Raman spectroscopy of bradykinin and its B2 receptor antagonists adsorbed onto colloidal suspended Ag nanowires

Literature Information

Publication Date 2015-08-05
DOI 10.1039/C5CP03438H
Impact Factor 3.676
Authors

D. Święch, I. Tanabe, S. Vantasin, D. Sobolewski, Y. Ozaki, A. Prahl, E. Proniewicz


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Abstract

The tip-enhanced Raman scattering (TERS) spectra of bradykinin (BK) and its potent B2 BK receptor antagonists, [D-Arg0,Hyp3,Thi5,8,L-Pip7]BK and [D-Arg0,Hyp3,Thi5,D-Phe7,L-Pip8]BK, approximately with a size of about 40 nm, adsorbed onto colloidal suspended Ag nanowires with diameter in the range of 350–500 nm and length of 2–50 μm were recorded. The metal surface plasmon resonance and morphology of the Ag nanowires were studied by ultraviolet-visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM). Briefly, it was shown that two C-terminal amino acids of BK and [D-Arg0,Hyp3,Thi5,8,L-Pip7]BK are involved in the interaction with the colloidal suspended Ag nanowire surface, whereas three last amino acids of the [D-Arg0,Hyp3,Thi5,D-Phe7,L-Pip8]BK sequence attached the Ag surface. Thus, BK adsorbs on the colloidal suspended Ag nanowires mainly through the Phe5/8 ring (tilted orientation) and the one oxygen atom of the carboxylate group and the H2N–C–NH–CH2– fragment of Arg9. In the case of [D-Arg0,Hyp3,Thi5,8,L-Pip7]BK, the Thi8 ring (through the lone electron pair on the sulfur atom) and the both oxygen atoms of the carboxylate group and the amine group of Arg9 mainly participated in the interaction with the Ag nanowire surface. For [D-Arg0,Hyp3,Thi5,D-Phe7,L-Pip8]BK, the D-Phe7 ring, the Pip8 ring, and the Arg9 side-chain assisted in the peptide interaction with the Ag surface. The obtained results emphasize the importance of the C-terminal part of these peptides in the adsorption process onto the colloidal suspended Ag nanowires.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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