1
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Talik P, Moskal P, Proniewicz LM, Wesełucha-Birczyńska A. The Raman spectroscopy approach to the study of Water–Polymer interactions in hydrated hydroxypropyl cellulose (HPC). J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128062] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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2
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Li H, Guo R, Liu Y, Liu S, Proniewicz E, Proniewicz LM, Zhao Y, Xu Y, Wu J. Self-nucleation-induced nonisothermal crystallization of nylon 6 from the melt. J Appl Polym Sci 2015. [DOI: 10.1002/app.42413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Huizhen Li
- School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang 453007 People's Republic of China
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
| | - Ran Guo
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
| | - Yuhai Liu
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
| | - Shaoxuan Liu
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
| | - Edyta Proniewicz
- Faculty of Chemistry; Jagiellonian University; ul. Ingardena 3 30-060 Krakow Poland
- Faculty of Foundry Engineering; AGH University of Science and Technology; ul. Reymonta 23 30-059 Krakow Poland
| | | | - Ying Zhao
- Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 People's Republic of China
| | - Yizhuang Xu
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
| | - Jinguang Wu
- College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 People's Republic of China
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3
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Tejchman W, Proniewicz LM, Zborowski KK. Molecular properties of selenomaltols: new interesting ligands for bioactive metal complexes. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3443] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Waldemar Tejchman
- Department of Chemistry, Institute of Biology; Pedagogical University of Cracow; 2 Podchorążych St. 30-084 Kraków Poland
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4
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Pięta E, Proniewicz E, Szmelter-Fausek B, Olszewska-Świetlik J, Proniewicz LM. Pigment characterization of important golden age panel paintings of the 17th century. Spectrochim Acta A Mol Biomol Spectrosc 2015; 136 Pt B:594-600. [PMID: 25448959 DOI: 10.1016/j.saa.2014.09.072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 09/10/2014] [Accepted: 09/18/2014] [Indexed: 06/04/2023]
Abstract
Samples were obtained from two world-famous 17th century panel paintings of the Gdańsk school of panting: 'Seven Acts of Charity' (1607, in St. Mary's Church in Gdańsk, Poland) by Anton Möller and 'Angelic Concert' (1611, in Diocesan Museum in Pelplin, Poland) by Hermann Han. Micro-Raman spectroscopy (MRS), optical microscopy (OM), and X-ray fluorescence (XRF) spectroscopy studies of the samples were performed to characterize the pigments present in the individual painting layers (a rich palette of white, black, blue, red, and yellow pigments) and the pictorial techniques used by the artists.
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Affiliation(s)
- Ewa Pięta
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
| | - Edyta Proniewicz
- Faculty of Foundry Engineering, AGH University of Science and Technology, ul. Reymonta 23, 30-059 Kraków, Poland.
| | - Bożena Szmelter-Fausek
- Department of Painting Technologies and Techniques, The Institute for the Study, Conservation and Restoration of Cultural Heritage, Nicolaus Copernicus University in Toruń, ul. Sienkiewicza 30/32, 87-100 Toruń, Poland
| | - Justyna Olszewska-Świetlik
- Department of Painting Technologies and Techniques, The Institute for the Study, Conservation and Restoration of Cultural Heritage, Nicolaus Copernicus University in Toruń, ul. Sienkiewicza 30/32, 87-100 Toruń, Poland
| | - Leonard M Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
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5
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Domin H, Pięta E, Piergies N, Święch D, Kim Y, Proniewicz LM, Proniewicz E. Neuropeptide Y and its C-terminal fragments acting on Y2 receptor: Raman and SERS spectroscopy studies. J Colloid Interface Sci 2014; 437:111-118. [PMID: 25313473 DOI: 10.1016/j.jcis.2014.09.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 09/17/2014] [Accepted: 09/19/2014] [Indexed: 12/12/2022]
Abstract
In this paper, we present spectroscopic studies of neuropeptide Y (NPY) and its native NPY(3-36), NPY(13-36), and NPY(22-36) and mutated acetyl-(Leu(28,31))-NPY(24-36)C-terminal fragments acting on Y2 receptor. Since there is some evidence for the correlation between the SERS patterns and the receptor binding ability, we performed a detailed analysis for these compounds at the metal/water interface using Raman spectroscopy (RS) and surface-enhanced Raman spectroscopy (SERS) methods. Many studies have suggested that interactions of this kind are crucial for a variety of biomedical and biochemical phenomena. The identification of amino acids in these peptide sequences by SERS allowed us to determine which molecular fragments were responsible for the interaction with the silver nanoparticle surface. Our findings demonstrated that in all of the investigated compounds, the NPY(32-36)C-terminal fragment (Thr(32)-Arg(33)-Gln(34)-Arg(35)-Tyr(36)NH2) was involved in the adsorption process onto metal substrate. The results of the present study suggest that the same molecular fragment interacts with the Y2 receptor, what proved the usefulness of the SERS method in the study of these biologically active compounds. The search for analogs acting on Y2 receptor may be important from the viewpoint of possible future clinical applications.
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Affiliation(s)
- Helena Domin
- Department of Neurobiology, Institute of Pharmacology, Polish Academy of Sciences, Smętna 12, 31-343 Kraków, Poland
| | - Ewa Pięta
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
| | - Natalia Piergies
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
| | - Dominika Święch
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Republic of Korea
| | - Leonard M Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Kraków, Poland
| | - Edyta Proniewicz
- Faculty of Foundry Engineering, AGH University of Science and Technology, ul. Reymonta 23, 30-059 Kraków, Poland.
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6
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Proniewicz E, Pięta E, Zborowski K, Kudelski A, Boduszek B, Olszewski TK, Kim Y, Proniewicz LM. Raman, Surface-Enhanced Raman, and Density Functional Theory Characterization of (Diphenylphosphoryl)(pyridin-2-, -3-, and -4-yl)methanol. J Phys Chem A 2014; 118:5614-25. [DOI: 10.1021/jp503392e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Edyta Proniewicz
- Faculty
of Foundry Engineering, AGH University of Science and Technology, ul. Reymonta 23, 30-059 Krakow, Poland
| | - Ewa Pięta
- Faculty
of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Krzysztof Zborowski
- Faculty
of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Andrzej Kudelski
- Department
of Chemistry, University of Warsaw, ul. L. Pasteura 1, 02-093, Warsaw, Poland
| | - Bogdan Boduszek
- Department
of Organic Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Tomasz K. Olszewski
- Department
of Organic Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Younkyoo Kim
- Department
of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Korea
| | - Leonard M. Proniewicz
- Faculty
of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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7
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Liu S, Zhang C, Proniewicz E, Proniewicz LM, Kim Y, Liu J, Zhao Y, Xu Y, Wu J. Crystalline transition and morphology variation of polyamide 6/CaCl2 composite during the decomplexation process. Spectrochim Acta A Mol Biomol Spectrosc 2013; 115:783-788. [PMID: 23892342 DOI: 10.1016/j.saa.2013.06.056] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 05/20/2013] [Accepted: 06/13/2013] [Indexed: 06/02/2023]
Abstract
In this work, we developed a new method to prepare porous PA6 with different morphologic feature and crystalline forms via the decomplexation of PA6/CaCl2 composite. The structures and morphology of thus obtained materials were characterized by vibrational spectroscopy (FT-IR and Raman) and scanning electron microscope (SEM) method. When amorphous PA6/CaCl2 composite films were treated in water at room temperature, PA6 re-arranges into γ form. However, decomplexation of the PA6/CaCl2 composite in boiling water produces PA6 in α crystalline form. If the PA6/CaCl2 composite is soaked in methanol, part of PA6 is dissolved or swollen in methanol/metal salt solutions. As a result, a dissolve/precipitation process occurred during the decomplexation process, which led to the formation of PA6 in α crystalline form. Further investigation demonstrates that the morphologies of the porous PA6 could be adjusted by using different solvents and/or different decomplexation conditions.
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Affiliation(s)
- Shaoxuan Liu
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China
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8
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Pięta E, Proniewicz E, Kim Y, Proniewicz LM. Vibrational characterization and adsorption mode on SERS-active surfaces of guanidino-(bromophenyl)methylphosphonic acid. Spectrochim Acta A Mol Biomol Spectrosc 2013; 121:121-128. [PMID: 24231748 DOI: 10.1016/j.saa.2013.09.136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Revised: 08/29/2013] [Accepted: 09/29/2013] [Indexed: 06/02/2023]
Abstract
This work presents adsorption geometry of [N-butyl-guanidino-(4-bromophenyl)methyl] phosphonic acid (4-BrPhG(n-But)P) on different SERS-active substrates (colloidal and specifically prepared Ag and Au roughened substrates). The adsorption mode is deduced from the SERS selection rules and several characteristic bands of the 4-BrPhG(n-But)P molecular fragments. The SERS spectra are compared to the experimental FT-Raman spectrum. In addition, the vibrational wavenumbers and PED's obtained for 4-BrPhG(n-But)P by using density functional theory methods with B3LYP/6-311++G(**) level of theory and PCM model is briefly presented.
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Affiliation(s)
- Ewa Pięta
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland; Faculty of Foundry Engineering, AGH University of Science and Technology, ul. Reymonta 23, 30-059 Krakow, Poland.
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Republic of Korea
| | - Leonard M Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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9
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Piergies N, Proniewicz E, Ozaki Y, Kim Y, Proniewicz LM. Influence of Substituent Type and Position on the Adsorption Mechanism of Phenylboronic Acids: Infrared, Raman, and Surface-Enhanced Raman Spectroscopy Studies. J Phys Chem A 2013; 117:5693-705. [DOI: 10.1021/jp404184x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Natalia Piergies
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
| | - Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
| | - Yukihiro Ozaki
- Department of Chemistry,
School
of Science and Technology, Kwansei-Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do,
449-791, Korea
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
- Department of Chemistry,
School
of Science and Technology, Kwansei-Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
- The State Higher Vocational School, ul. Mickiewicza 8, 33-100 Tarnów,
Poland
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Fościak M, Proniewicz E, Zborowski K, Kim Y, Proniewicz LM. Resonance Raman and absorption infrared with density functional theory studies of Fe(III)/Fe(II) and Ni(II) complexes of modified 21-oxaporphyrins. J PORPHYR PHTHALOCYA 2013. [DOI: 10.1142/s1088424613500053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This work presents a complete vibrational analysis of iron [ Fe (II) and Fe (III)] and nickel [ Ni (II)] complexes with 5,10,15,20-tetraphenyl-21-oxaporphyrin [OTPPH] and 5,20-bis(p-tolyl)-10,15-diphenyl-21-oxaporphyrin [ODTDPPH]. In these porphyrins, a furan ring replaces one of the pyrrole rings. The six-coordinate (OTPP) FeIIICl2 and (ODTDPP) FeIIICl2 as well as the five-coordinate (OTPP) FeIICl and (OTPP) NiIICl complexes were investigated using experimental and theoretical methods. The experimental part of this work involved Fourier-transform absorption infrared (FT-IR), resonance Raman (RR), and electron absorption (UV-vis) measurements for all of the investigated complexes. In the theoretical section, optimized geometries and vibrational frequencies for model compounds are provided. The theoretical calculations were performed at the B3LYP level with the LANL2DZ basis set. Good agreement was achieved between the experimental and theoretical vibrational spectra. In addition, charge distributions (GAPT) and geometrical aromaticity indices (Bird's I5 and HOMA) were calculated and discussed.
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Affiliation(s)
- Mateusz Fościak
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Street, 30-060 Krakow, Poland
| | - Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Street, 30-060 Krakow, Poland
| | - Krzysztof Zborowski
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Street, 30-060 Krakow, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Korea
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, 3 Ingardena Street, 30-060 Krakow, Poland
- The State Higher Vocational School, ul. Mickiewicza 8, 33-100 Tarnów, Poland
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11
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Ignatjev I, Proniewicz E, Proniewicz LM, Niaura G. Effect of potential on temperature-dependent SERS spectra of neuromedin B on Cu electrode. Phys Chem Chem Phys 2013. [PMID: 23202809 DOI: 10.1039/c2cp42077e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Adsorption of decapeptide neuromedin B (NMB) on copper electrode has been investigated by in situ surface-enhanced Raman scattering (SERS) spectroelectrochemistry in the temperature interval from 12 to 72 °C at -0.600 and -1.000 V potentials. It was found that intensities of peptide bands decrease at temperatures above 30 °C with higher decrease slope at -1.000 V. Frequency of F12 mode (1004 cm(-1)) of non-surface-interactive phenylalanine residue was found to be insensitive to temperature variation at both studied electrode potentials, while frequency-temperature curves for surface-interactive groups (Amide-III, methylene) were found to be controlled by the potential. In particular, opposite frequency-temperature trends were detected for Amide-III (Am-III) mode indicating decrease in H-bonding interaction strength of amide C[double bond, length as m-dash]O and N-H groups above 38 °C for -0.600 V, and increase in H-bonding interaction strength between 12 and 72 °C for -1.000 V. Anomalous Am-III temperature-dependence of the frequency at -1.000 V was explained by temperature-induced transformation of a disordered secondary structure to a helix-like conformation. The potential-difference spectrum revealed interaction of methylene groups with Cu surface at sufficiently negative potential values because of the appearance of a soft C-H stretching band near 2825 cm(-1) and a broad band near 2904 cm(-1) assigned to vibration of a distal C-H bond of the surface-confined methylene group. Consequently, a rapid decrease in frequency of CH(2)-stretching band with temperature was observed at -1.000 V, while no essential frequency changes were detected for this mode at -0.600 V. The results show that electrode potential controls the temperature-dependence of the frequency for vibrations associated with surface-interactive molecular groups.
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Affiliation(s)
- Ilja Ignatjev
- Institute of Chemistry, Center for Physical Sciences and Technology, A. Goštauto 9, LT-01108, Vilnius, Lithuania
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12
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Proniewicz E, Pięta E, Kudelski A, Piergies N, Skołuba D, Kim Y, Proniewicz LM. Vibrational and Theoretical Studies of the Structure and Adsorption Mode of m-Nitrophenyl α-Guanidinomethylphosphonic Acid Analogues on Silver Surfaces. J Phys Chem A 2013; 117:4963-72. [DOI: 10.1021/jp403045g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Ewa Pięta
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Andrzej Kudelski
- Faculty of Chemistry, University of Warsaw, ul. L. Pasteura 1, 02-093 Warsaw, Poland
| | - Natalia Piergies
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Dominika Skołuba
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do,
449-791, Korea
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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13
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Abstract
Abstract
Possible structures of α-tropolone (2-hydroxy-2,4,6-cycloheptatrien-1-one) tautomers: four neutral, thirteen protonated, and four deprotonated, are studied at the B3LYP/6-311++G∗∗ computational level. The energies and the free energies calculated for the studied tautomers show that for each of the three forms, among all the possible tautomers in the tautomeric mixture, only one structure is expected: a keto-enol structure with an intramolecular hydrogen bond (neutral α-tropolone molecule), the structure with two deprotonated exocyclic oxygen atoms (tropolonate, deprotonated tropolone), and the structure with two hydroxyl group forming an intramolecular hydrogen bond (protonated tropolone). The relative energies of the studied tautomers are rationalized based on the results from the atomic energy integration performed within the frame of the Quantum Theory of Atoms in Molecules.
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Affiliation(s)
| | | | - Younkoyoo Kim
- Hankuk University of Foreign Studies, Department of Chemistry, Republik Korea
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14
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Proniewicz E, Piergies N, Ozaki Y, Kim Y, Proniewicz LM. Investigation of adsorption mode of a novel group of N-benzylamino(boronphenyl)methylphosphonic acids using SERS. Spectrochim Acta A Mol Biomol Spectrosc 2013; 103:167-172. [PMID: 23261609 DOI: 10.1016/j.saa.2012.10.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 09/30/2012] [Accepted: 10/23/2012] [Indexed: 06/01/2023]
Abstract
Here, we report a systematic surface-enhanced Raman spectroscopy (SERS) study of the structures of five N-benzylamino(boronphenyl)-methylphosphonic acids: N-benzylamino-(3-boronphenyl)-S-methylphosphonic acid (m-PhS), N-benzylamino-(4-boronphenyl)-S-methylphosphonic acid (p-PhS), N-benzylamino-(2-boronphenyl)-R-methylphosphonic acid (o-PhR), N-benzylamino-(3-boronphenyl)-R-methyl-phosphonic acid (m-PhR), and N-benzylamino-(4-boronphenyl)-R-methylphosphonic acid (p-PhR) adsorbed on nanometer-sized colloidal particles (20-25 nm). For example, we showed that all of these molecules interact with the colloidal surface through a boronophenyl ring, which plane remained vertical on the surface. For p-PhS, a preferential interaction between the P=O bond and the colloidal silver surface is observed to be stronger than for the remaining compounds. The -P(OH)(2) and -B(OH)(2) fragments take part in the adsorption process. However, the B-O bond of p-PhS and p-PhR seemed to be tilted with respect to the silver surface.
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Affiliation(s)
- Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland.
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15
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Zborowski KK, Mohammadpour M, Sadeghi A, Proniewicz LM. Theoretical study on the molecular tautomerism of the 3-hydroxy-pyridin-4-one system. Mol Phys 2013. [DOI: 10.1080/00268976.2012.760052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Piergies N, Proniewicz E, Kudelski A, Rydzewska A, Kim Y, Andrzejak M, Proniewicz LM. Fourier Transform Infrared and Raman and Surface-Enhanced Raman Spectroscopy Studies of a Novel Group of Boron Analogues of Aminophosphonic Acids. J Phys Chem A 2012; 116:10004-14. [DOI: 10.1021/jp307064p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Natalia Piergies
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
| | - Edyta Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
| | - Andrzej Kudelski
- Faculty of Chemistry, University of Warsaw, ul. L. Pasteura 1, 02-093 Warsaw,
Poland
| | - Agata Rydzewska
- Department of Bioorganic
Chemistry,
Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspianskiego 27, 50-370, Wrocław, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do,
449-791, Korea
| | - Marcin Andrzejak
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow,
Poland
- The State Higher Vocational School, ul. Mickiewicza 8, 33-100 Tarnów,
Poland
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17
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Zborowski KK, Alkorta I, Elguero J, Proniewicz LM. HOMA parameters for the boron–boron bond: How the introduction of a BB bond influences the aromaticity of selected hydrocarbons. Struct Chem 2012. [DOI: 10.1007/s11224-012-0109-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Zborowski KK, Grybos R, Wesełucha-Birczyńska A, Kim Y, Proniewicz LM. Quantum mechanical study of the tautomerism and molecular spectra of 2-hydroxy-3-methyl-2-cyclopenten-1-one. Mol Phys 2012. [DOI: 10.1080/00268976.2011.646336] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Podstawka E, Fościak M, Chmielewski P, Proniewicz LM. Vibrational analysis of Ni(II) complex with 4,12-ditolyl-16,24-diphenyl-3-thiaporphyrin (SDTDPPNi(II)Cl) and its isotopic labeled (61Ni(II), −d6, and −d10) derivatives. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s108842460700076x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This work presents complete vibrational analysis of a chloride complex of Ni (II) 4,12-ditolyl-16,24-diphenyl-3-thiaporphyrin ( SDTDPPNi (II) Cl ) and its isotopic derivatives (61 Ni (II), − d 6, and −d 10). Five-coordinate SDTDPPNi (II) Cl , SDTDPP 61 Ni (II) Cl , ( SDTDPP - d 6) Ni (II) Cl , and ( SDTDPP - d 10) Ni (II) Cl were investigated by Fourier-Transform infrared (FT-IR), resonance Raman (RR), and electronic absorption (UV-vis) methods. Because the methyl groups of tolyl rings at the para-position have negligible influence on geometry and vibrational spectra of SDTDPPNi (II) Cl , they can be treated as point groups. Thus, geometry optimization and vibrational frequencies were calculated for the 4,12,16,24-tetraphenyl-3-thiaporphyrin ( STPPNi (II) Cl ) model molecule and its isotopically labeled analogs using Gaussian'03. Moreover, charge distributions (General Atomic Polar Tensor – GAPT) and geometrical aromaticity indexes (Bird's I 5 and Harmonic Oscillator Model of Aromaticity – HOMA) were calculated. All theoretical calculations were performed at the B3LYP level with the LANL2DZ basis set. As is shown, the experimental FT-IR and RR spectra for each compound are reproduced well by the corresponding theoretical spectra.
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Affiliation(s)
- Edyta Podstawka
- Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, 3 Ingardena Str., 30-060 Krakow, Poland
| | - Mateusz Fościak
- Faculty of Chemistry, Chemical Physics Division, Jagiellonian University, 3 Ingardena Str., 30-060 Krakow, Poland
| | - Piotr Chmielewski
- Faculty of Chemistry, Wroclaw University, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland
| | - Leonard M. Proniewicz
- Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, 3 Ingardena Str., 30-060 Krakow, Poland
- Faculty of Chemistry, Chemical Physics Division, Jagiellonian University, 3 Ingardena Str., 30-060 Krakow, Poland
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Marzec KM, Gawel B, Zborowski KK, Lasocha W, Proniewicz LM, Malek K. Insight into coordination of dilead unit by molecules of 4-thiazolidinone-2-thione: Structural and computational studies. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.07.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Podstawka-Proniewicz E, Piergies N, Skołuba D, Kafarski P, Kim Y, Proniewicz LM. Vibrational Characterization of l-Leucine Phosphonate Analogues: FT-IR, FT-Raman, and SERS Spectroscopy Studies and DFT Calculations. J Phys Chem A 2011; 115:11067-78. [DOI: 10.1021/jp207101m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Natalia Piergies
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Dominika Skołuba
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Paweł Kafarski
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw Technical University, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do, 449-791, Korea
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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Ignatjev I, Podstawka-Proniewicz E, Niaura G, Lombardi JR, Proniewicz LM. Potential Induced Changes in Neuromedin B Adsorption on Ag, Au, and Cu Electrodes Monitored by Surface-Enhanced Raman Scattering. J Phys Chem B 2011; 115:10525-36. [DOI: 10.1021/jp2026863] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ilja Ignatjev
- Institute of Chemistry, Center for Physical Sciences and Technology, A. Gostauto 9, LT-01108, Vilnius, Lithuania
| | | | - Gediminas Niaura
- Institute of Chemistry, Center for Physical Sciences and Technology, A. Gostauto 9, LT-01108, Vilnius, Lithuania
| | - John R. Lombardi
- Department of Chemistry, City College of New York, 160 Convent Avenue, New York, New York 10031, United States
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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Wesełucha-Birczyńska A, Słowakiewicz M, Natkaniec-Nowak L, Proniewicz LM. Raman microspectroscopy of organic inclusions in spodumenes from Nilaw (Nuristan, Afghanistan). Spectrochim Acta A Mol Biomol Spectrosc 2011; 79:789-796. [PMID: 20884283 DOI: 10.1016/j.saa.2010.08.054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 07/11/2010] [Accepted: 08/26/2010] [Indexed: 05/29/2023]
Abstract
The color varieties of spodumene (green spodumene, kunzite) from Nilaw mine (Nuristan, Afghanistan) have been investigated by microthermometry and Raman spectroscopy analyses. These minerals are rich in primary and secondary fluid inclusions. Measured values of temperature homogenization (T(h)) and pressure (P) for selected fluid-inclusion assemblages (I-IV) FIA in green spodumene and (I-II) FIA in kunzite ranges from 370 to 430°C, 1.16 to 1.44 kbar and 300 to 334°C, 0.81 to 1.12 kbar, respectively. The brine content and concentration varies from 4.3 to 6.6 wt.% eq. NaCl. Numerous and diverse mineral phases (quartz, feldspars, mica, beryl, zirconium, apatite, calcite, gypsum) present in this mineral as solid inclusions were studied by Raman microspectroscopy. Raman spectra of selected fluid, organic and solid inclusions were collected as line or rectangular maps and also depth profiles to study their size and contents. There appeared very interesting calcite (156, 283, 711 and 1085 cm(-1)), beryl (324, 397, 686, 1068 and 3610 cm(-1)), topaz (231, 285, 707, 780 and 910 cm(-1)) and spodumene (355, 707 and 1073 cm(-1)) inclusions accompanied by fluid and/or organic inclusions (liquid and gas hydrocarbons) with bands at 2350 cm(-1) (CO(2), N(2)), 2550 cm(-1) (H(2)S) and 2900 cm(-1) (C(2)H(6)-CH(3)). Some solid inclusions contain carbonaceous matter (D-band at ca. 1320 cm(-1) and/or G-band at ca. 1600 cm(-1)).
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Podstawka-Proniewicz E, Kudelski A, Kim Y, Proniewicz LM. Structure and Binding of Specifically Mutated Neurotensin Fragments on a Silver Substrate: Vibrational Studies. J Phys Chem B 2011; 115:7097-108. [DOI: 10.1021/jp201316n] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
| | - Andrzej Kudelski
- Faculty of Chemistry, University of Warsaw, ul. L. Pasteura 1, 02-093 Warsaw, Poland
| | - Younkyoo Kim
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Kyunggi-Do 449-791, Korea
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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Podstawka-Proniewicz E, Kudelski A, Kim Y, Proniewicz LM. Structure of monolayers formed from neurotensin and its single-site mutants: vibrational spectroscopic studies. J Phys Chem B 2011; 115:6709-21. [PMID: 21542591 DOI: 10.1021/jp200805f] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The human, pig, and frog neurotensins and four single-site mutants of human neurotensin (NT), having the following modifications, [Gln(4)]NT, [Trp(11)]NT, [D-Trp(11)]NT, and [D-Tyr(11)]NT, were immobilized onto an electrochemically roughened silver electrode surface in an aqueous solution. The orientation of adsorbed molecules was determined from surface-enhanced Raman scattering (SERS) measurements. A comparison was made between these structures to determine how the change upon the mutation of the neurotensin structure influences its adsorption properties. The SERS patterns were correlated with the contribution of the structural components of the aforementioned peptides to the ability to interact with the NTR1 G-protein receptor. Briefly, the SERS spectra revealed that the substitution of native amino acids in investigated peptides influenced slightly their adsorption state on an electrochemically roughened silver surface. Thus, human, pig, and frog neurotensins and [Gln(4)]NT and [D-Tyr(11)]NT tended to adsorb to the surface via the tyrosine ring, the oxygen atom of the deprotonated phenol group of Tyr(11), and the -CH(2)- unit(s), most probably of Tyr(11), Arg(9), and/or Leu(13). The observed changes in the enhancement of the deprotonated Tyr residue SERS signals indicated a further parallel orientation of a phenol-O bond with regard to the silver surface normal for pig NT, [Gln(4)]NT, and [D-Tyr(11)]NT, whereas the orientation was slightly tilted for human and frog NT. In the case of [Trp(11)]NT and [D-Trp(11)]NT, the formation of a peptide/Ag complex was confirmed by strong SERS bands involving the phenyl co-ring of Trp(11)/d-Trp(11) and -CH(2)- vibrations and the tilted and flat orientations of the two compounds with respect to the surface substrate. The spectral features were accompanied by a SERS signal caused by vibrations of the carboxyl group of C-terminal Leu(13) and the guanidine group of Arg(9). Reported changes in SERS spectra of L and D isomers were fully supported by generalized two-dimensional correlation analysis. Additionally, a combination of mutation-labeling and vibrational spectroscopy (Fourier-transform Raman and absorption infrared) was used to investigate the possible peptide conformations and environments of the tyrosine residues.
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Chruszcz-Lipska K, Zborowski KK, Podstawka-Proniewicz E, Liu S, Xu Y, Proniewicz LM. Phosphonic drugs: Experimental and theoretical spectroscopic studies of fosfomycin. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2010.11.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Podstawka-Proniewicz E, Kosior M, Kim Y, Rolka K, Proniewicz LM. Nociceptin and its natural and specifically-modified fragments: Structural studies. Biopolymers 2010; 93:1039-54. [PMID: 20629016 DOI: 10.1002/bip.21516] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The vibrational structures of Nociceptin (FQ), its short bioactive fragments, and specifically-modified [Tyr¹]FQ (1-6), [His¹]FQ (1-6), and [His(1,4)]FQ (1-6) fragments were characterized. We showed that in the solid state, all of the aforementioned peptides except FQ adopt mainly turn and disordered secondary structures with a small contribution from an antiparallel β-sheet conformation. FQ (1-11), FQ (7-17) [His¹]FQ (1-6), and [His(1,4)]FQ (1-6) have an α-helical backbone arrangement that could also slightly influence their secondary structure. The adsorption behavior of these peptides on a colloidal silver surface in an aqueous solution (pH = ∼8.3) was investigated by means of surface-enhanced Raman scattering (SERS). All of the peptides, excluding FQ (7-17), chemisorbed on the colloidal silver surfaces through a Phe⁴ residue, which for FQ, FQ (1-11), FQ (1-6), [Tyr¹]FQ (1-6), and [His¹]FQ (1-6) lies almost flat on this surface, while for FQ (1-13) and FQ (1-13)NH₂ adopts a slightly tilted orientation with respect to the surface. The Tyr¹ residue in [Tyr¹]FQ (1-6) does not interact with the colloidal silver surface, suggesting that the Tyr¹ and Phe⁴ side chains are located on the opposite sides of the peptide backbone, which can be also true for His¹ and Phe⁴ in [His¹]FQ (1-6). The lone pair of electrons on the oxygen atom of the ionized carbonyl group of FQ (1-13) and FQ (7-17) appears to be coordinated to the colloidal silver nanoparticles, whereas in the case of the remaining peptides, it only assists in the adsorption process, similar to the --NH⁴ group. We also showed that upon adsorption, the secondary structure of these peptides is altered.
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Zborowski KK, Solà M, Poater J, Proniewicz LM. Theoretical studies on aromaticity of selected hydroxypyrones. Part 3#. Chelatoaromaticity phenomenon in metalcomplexes of hydroxypyrones. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1794] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Podstawka-Proniewicz E, Niaura G, Proniewicz LM. Neuromedin C: Potential-Dependent Surface-Enhanced Raman Spectra in the Far-Red Spectral Region on Silver, Gold, and Copper Surfaces. J Phys Chem B 2010; 114:5117-24. [DOI: 10.1021/jp910575f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edyta Podstawka-Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Department of Bioelectrochemistry and Biospectroscopy, Institute of Biochemistry, Mokslininkų 12, LT-08662 Vilnius, Lithuania
| | - Gediminas Niaura
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Department of Bioelectrochemistry and Biospectroscopy, Institute of Biochemistry, Mokslininkų 12, LT-08662 Vilnius, Lithuania
| | - Leonard M. Proniewicz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Department of Bioelectrochemistry and Biospectroscopy, Institute of Biochemistry, Mokslininkų 12, LT-08662 Vilnius, Lithuania
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Podstawka E, Niaura G, Proniewicz LM. Potential-dependent studies on the interaction between phenylalanine-substituted bombesin fragments and roughened Ag, Au, and Cu electrode surfaces. J Phys Chem B 2010; 114:1010-29. [PMID: 20025214 DOI: 10.1021/jp909268c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we report systematic surface-enhanced Raman spectroscopy (SERS) and generalized two-dimensional correlation analysis (G2DCA) studies of the structures of five specifically modified phenylalanine-substituted C-terminal bombesin 6-14 fragments (BN(6-14)). The fragments studied have all been tested as chemotherapeutic agents in cancer therapy, and they form amino acid sequences in bombesin: cyclo[d-Phe(6),His(7),Leu(14)]BN(6-14), [D-Phe(6),Leu-NHEt(13),des-Met(14)]BN(6-14), [D-Phe(6),Leu(13)-((R))-p-Cl-Phe(14)]BN(6-14), [D-Phe(6),beta-Ala(11),Phe(13),Nle(14)]BN(6-14), and [D-Tyr(6),beta-Ala(11),Phe(13),Nle(14)]BN(6-14). We adsorbed these fragments onto roughened Ag, Au, and Cu electrode surfaces, using a potential range from -1.200 to 0.400 V, at physiological pH. We compared the adsorption mechanism of each fragment on these substrates, as well any changes observed with varying electrode potential, to determine the relationship between adsorption strength and geometry of each of the peptides wherever it was possible. For example, we showed that none of these fragments directly interact with the Ag, Au, and Cu surfaces via residues of Phe (phenylalanine) and Trp(8) (L-tryptophane at position 8 of the BN amino acid sequence) or by an amide bond, due to a very small shift in wavenumber of their characteristic vibrations. Specific interactions were recognized from the broadening, wavenumber shift, and increase in intensity of the W18 Trp(8) mode near 759 cm(-1) and decrease in nu(12) vibration frequency of the Phe residue. In general, more intense SERS bands were observed due to the Phe ring, compared with the Trp(8) ring, which suggested a preferential adsorption of phenylalanine over tryptophane. For [D-Tyr(6),beta-Ala(11),Phe(13),Nle(14)]BN(6-14), the data also suggest some interaction of a D-Tyr(6) residue (D-tyrosine at position 6). Finally, only slight rearrangements of these moieties on the substrates are observed with changes in electrode potential.
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Affiliation(s)
- Edyta Podstawka
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland.
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Bolechała K, Zborowski KK, Żuchowski G, Proniewicz LM. Influence of substitution of oxygen by sulfur on maltol properties. J PHYS ORG CHEM 2009. [DOI: 10.1002/poc.1551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Podstawka E, Olszewski TK, Boduszek B, Proniewicz LM. Adsorbed States of Phosphonate Derivatives of N-Heterocyclic Aromatic Compounds, Imidazole, Thiazole, and Pyridine on Colloidal Silver: Comparison with a Silver Electrode. J Phys Chem B 2009; 113:12013-8. [DOI: 10.1021/jp9050116] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edyta Podstawka
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Organic Chemistry Division, Faculty of Chemistry, Wroclaw University of Technology, ul. Wybrzeże S. Wyspiańskiego 27, 50-370 Wrocław, Poland, and Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Tomasz K. Olszewski
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Organic Chemistry Division, Faculty of Chemistry, Wroclaw University of Technology, ul. Wybrzeże S. Wyspiańskiego 27, 50-370 Wrocław, Poland, and Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Bogdan Boduszek
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Organic Chemistry Division, Faculty of Chemistry, Wroclaw University of Technology, ul. Wybrzeże S. Wyspiańskiego 27, 50-370 Wrocław, Poland, and Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Leonard M. Proniewicz
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, Organic Chemistry Division, Faculty of Chemistry, Wroclaw University of Technology, ul. Wybrzeże S. Wyspiańskiego 27, 50-370 Wrocław, Poland, and Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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Balakrishnan G, Zhao X, Podstawska E, Proniewicz LM, Kincaid JR, Spiro TG. Subunit-selective interrogation of CO recombination in carbonmonoxy hemoglobin by isotope-edited time-resolved resonance Raman spectroscopy. Biochemistry 2009; 48:3120-6. [PMID: 19245215 PMCID: PMC2722936 DOI: 10.1021/bi802190f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hemoglobin (Hb) is an allosteric tetrameric protein made up of alphabeta heterodimers. The alpha and beta chains are similar, but are chemically and structurally distinct. To investigate dynamical differences between the chains, we have prepared tetramers in which the chains are isotopically distinguishable, via reconstitution with (15)N-heme. Ligand recombination and heme structural evolution, following HbCO dissociation, was monitored with chain selectivity by resonance Raman (RR) spectroscopy. For alpha but not for beta chains, the frequency of the nu(4) porphyrin breathing mode increased on the microsecond time scale. This increase is a manifestation of proximal tension in the Hb T-state, and its time course is parallel to the formation of T contacts, as determined previously by UVRR spectroscopy. Despite the localization of proximal constraint in the alpha chains, geminate recombination was found to be equally probable in the two chains, with yields of 39 +/- 2%. We discuss the possibility that this equivalence is coincidental, in the sense that it arises from the evolutionary pressure for cooperativity, or that it reflects mechanical coupling across the alphabeta interface, evidence for which has emerged from UVRR studies of site mutants.
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Affiliation(s)
| | - Xiaojie Zhao
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - Edyta Podstawska
- Department of Chemistry, Marquette University, Milwaukee, WI 53233, USA
- Department of Chemistry, Jagiellonian University, Krakow, Poland
| | - Leonard M. Proniewicz
- Department of Chemistry, Marquette University, Milwaukee, WI 53233, USA
- Department of Chemistry, Jagiellonian University, Krakow, Poland
| | - James R. Kincaid
- Department of Chemistry, Marquette University, Milwaukee, WI 53233, USA
| | - Thomas G. Spiro
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
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Podstawka E, Proniewicz LM. The Orientation of BN-Related Peptides Adsorbed on SERS-Active Silver Nanoparticles: Comparison with a Silver Electrode Surface. J Phys Chem B 2009; 113:4978-85. [DOI: 10.1021/jp8110716] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Edyta Podstawka
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, and Chemical Physics Division, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Leonard M. Proniewicz
- Regional Laboratory of Physicochemical Analysis and Structural Research, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, and Chemical Physics Division, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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Hetmańczyk J, Hetmańczyk Ł, Migdał-Mikuli A, Mikuli E, Drużbicki K, Wesełucha-Birczyńska A, Proniewicz LM. Vibrations and reorientations of H[sub 2]O molecules and NO[sub 3]−] anions in [Ca(H[sub 2]O)[sub 4]](NO[sub 3])[sub 2] studied by incoherent inelastic neutron scattering, Raman light scattering, and infrared absorption spectroscopy. J Chem Phys 2009; 131:094506. [DOI: 10.1063/1.3202767] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Podstawka E, Kafarski P, Proniewicz LM. Structural Properties of l-X-l-Met-l-Ala Phosphonate Tripeptides: A Combined FT-IR, FT-RS, and SERS Spectroscopy Studies and DFT Calculations. J Phys Chem A 2008; 112:11744-55. [DOI: 10.1021/jp803674q] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edyta Podstawka
- Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, and Chemical Physics Division, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, and Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw Technical University, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Paweł Kafarski
- Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, and Chemical Physics Division, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, and Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw Technical University, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
| | - Leonard M. Proniewicz
- Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, and Chemical Physics Division, Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland, and Department of Bioorganic Chemistry, Faculty of Chemistry, Wroclaw Technical University, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
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Podstawka E, Ozaki Y, Proniewicz LM. Structures and bonding on a colloidal silver surface of the various length carboxyl terminal fragments of bombesin. Langmuir 2008; 24:10807-10816. [PMID: 18759412 DOI: 10.1021/la8012415] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Raman (RS) and surface-enhanced Raman scattering spectra (SERS) were measured for various length carboxyl terminal fragments (X-14 of amino acid sequence) of bombesin ( BN): BN13-14, BN12-14, BN11-14, BN10-14, BN9-14, and BN8-14 in silver colloidal solutions. Density functional theory (DFT) calculations of Raman wavenumbers and intensities with extended basis sets (B3LYP/6-31++G**) were performed with the aim of providing the definitive band allocations to the normal coordinates. The proposed band assignment is consistent with the assignment for similar compounds reported in the literature. The nonadsorbed and adsorbed molecular structures were deducted by detailed spectral analysis of the RS and SERS spectra, respectively. This analysis also allowed us to propose the particular surface geometry and orientation of these peptides on silver surface, and their specific interaction with the surface. For example, a SERS spectrum of BN8-14 indicates that the interaction of a thioether atom and Trp8 with the silver surface is favorable and may dictate the orientation and conformation of adsorbed peptide. One of the most prominent and common features in all of the fragments' SERS spectra is a approximately 692 cm (-1) band due to nu(C-S) accompanied by two or three bands of different C-S conformers for all, except BN8-14, which suggests that all of the above-mentioned compounds adsorb on the silver surface through the thioether atom and that the attachment of Trp8 produces limitation in a number of possible C-S conformers adopted on this surface. Our results also show clearly that His12 and CO do not interact with the colloid surface, which supports our earlier results.
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Affiliation(s)
- Edyta Podstawka
- Department of Chemistry, School of Science and Technology, Kwansei-Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.
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Malek K, Zborowski K, Gebski K, Proniewicz LM, Schroeder G. 1,3,4-oxadiazoles: evaluation of aromaticity and atomic charge distribution. Mol Phys 2008. [DOI: 10.1080/00268970802317512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zborowski K, Proniewicz LM. Theoretical studies on aromaticity of selected hydroxypyrones and their cations and anions. Part 2. Electron delocalisation in the OCCO group. J PHYS ORG CHEM 2008. [DOI: 10.1002/poc.1294] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kaczor A, Reva ID, Proniewicz LM, Fausto R. Matrix-Isolated Monomeric Tryptophan: Electrostatic Interactions as Nontrivial Factors Stabilizing Conformers. J Phys Chem A 2007; 111:2957-65. [PMID: 17388406 DOI: 10.1021/jp070097c] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An extensive analysis of the conformational space of tryptophan (Trp) was performed at the B3LYP/6-311++G(d,p) level and verified by comparison with the infrared spectra of the compound isolated in low-temperature argon and xenon matrixes. Different types of conformers have been unequivocally identified in the matrixes. Type I exhibits the trans arrangement of the carboxylic group and is stabilized by an O-H...N intramolecular H-bond. Types II and III have the carboxylic group in the cis conformation and feature N-H...O=C and N-H...O-C hydrogen bonds, respectively. Three individual conformers of type I were identified in the matrixes. Other conformational degrees of freedom are related with the Calpha-Cbeta-Cgamma=C and C1-Calpha-Cbeta-Cgamma angles (chi1 and chi2, respectively). In proteins, these two dihedral angles define the conformations of the amino acid residues. In monomeric Trp, chi1 adopts the "+" (ca. +90 degrees ) and "-" (ca. -90 degrees ) orientations, while average values of -67.4, 170.5, and 67.6 degrees ("a", "b", and "c", respectively) were found for chi2. Theoretical analysis revealed two important factors in stabilizing the structures of the Trp conformers: the H-bond type and electrostatic interactions. Classified by the H-bond type, the most stable are forms I, followed by II and III. Out of possible combinations of the chi1 and chi2 dihedral angles, "a+", "b+", and "c-" were theoretically found more stable than their "a-", "b-", and "c+" counterparts. Thus, the stabilizing effect of interactions involving the pyrrole ring (which are possible in Ia+, Ib+, and Ic- conformers) is considerably higher compared to those in which the phenyl ring is engaged (existing in the Ia-, Ib-, and Ic+ forms).
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Affiliation(s)
- A Kaczor
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal.
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Podstawka E, Mak PJ, Kincaid JR, Proniewicz LM. Low frequency resonance Raman spectra of isolated alpha and beta subunits of hemoglobin and their deuterated analogues. Biopolymers 2007; 83:455-66. [PMID: 16845667 DOI: 10.1002/bip.20573] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In an attempt to gain further insight into the nature of the low frequency vibrational modes of hemoglobin and its isolated subunits, a comprehensive study of several different isotopically labeled analogues has been undertaken and is reported herein. Specifically, the resonance Raman spectra, between 200 and 500 cm(-1), are reported for the deoxy and ligated (CO and O2) forms of the isolated alpha and beta subunits containing the natural abundance or various deuterated analogues of protoheme. The deuterated protoheme analogues studied include the 1,3,5,8-C2H3-protoheme (d12- protoheme), the 1,3-C2H3-protoheme (1,3-d6-protoheme), the 5,8-C2H3-protoheme (5,8-d6-protoheme), and the meso-C2H4-protoheme (d4-protoheme). The entire set of acquired spectra has been analyzed using a deconvolution procedure to help correlate the shifted modes with their counterparts in the spectra of the native forms. Interestingly, modes previously associated with so-called vinyl bending modes or propionate deformation modes are shown to be quite sensitive to deuteration of the peripheral methyl groups of the macrocycle, shifting by up to 12-15 cm(-1), revealing their complex nature. Of special interest is the fact that shifts observed for the 1,3-d6- and 5,8-d6-protoheme analogues confirm the fact that certain modes are associated with a given portion of the macrocycle; i.e., only certain modes shift upon deuteration of the 1 and 3 methyl groups, while others shift upon deuteration of the 5 and 8 methyl groups. Compared with the spectra previously reported for the corresponding myoglobin derivatives, the data reported here reveal the appearance of several additional features that imply splitting of modes associated with the propionate groups or that are indicative of greater distortion of the heme prosthetic groups.
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Affiliation(s)
- Edyta Podstawka
- Department of Chemistry, Marquette University, Milwaukee, WI 53201-1881 USA
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Kaczor A, Reva ID, Proniewicz LM, Fausto R. Importance of Entropy in the Conformational Equilibrium of Phenylalanine: A Matrix-Isolation Infrared Spectroscopy and Density Functional Theory Study. J Phys Chem A 2006; 110:2360-70. [PMID: 16480295 DOI: 10.1021/jp0550715] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conformational behavior and infrared spectrum of l-phenylalanine were studied by matrix-isolation infrared spectroscopy and DFT [B3LYP/6-311++G(d,p)] calculations. The fourteen most stable structures were predicted to differ in energy by less than 10 kJ mol(-1), eight of them with abundances higher than 5% at the temperature of evaporation of the compound (423 K). Experimental results suggest that six conformers contribute to the spectrum of the isolated compound, whereas two conformers (IIb(3) and IIIb(3)) relax in matrix to a more stable form (IIb(2)) due to low energy barriers for conformational isomerization (conformational cooling). The two lowest-energy conformers (Ib(1), Ia) differ only in the arrangement of the amino acid group relative to the phenyl ring; they exhibit a relatively strong stabilizing intramolecular hydrogen bond of the O-H...N type and the carboxylic group in the trans configuration (O=C-O-H dihedral angle ca. 180 degrees ). Type II conformers have a weaker H-bond of the N-H...O=C type, but they bear the more favorable cis arrangement of the carboxylic group. Being considerably more flexible, type II conformers are stabilized by entropy and the relative abundances of two conformers of this type (IIb(2) and IIc(1)) are shown to significantly increase with temperature due to entropic stabilization. At 423 K, these conformers are found to be the first and third most abundant species present in the conformational equilibrium, with relative populations of ca. 15% each, whereas their populations could be expected to be only ca. 5% if entropy effects were not taken into consideration. Indeed, phenylalanine can be considered a notable example of a molecule where entropy plays an essential role in determining the relative abundance of the possible low-energy conformational states and then, the thermodynamics of the compound, even at moderate temperatures. Upon UV irradiation (lambda > 235 nm) of the matrix-isolated compound, unimolecular photodecomposition of phenylalanine is observed with production of CO(2) and phenethylamine.
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Affiliation(s)
- A Kaczor
- Department of Chemistry, University of Coimbra, P-3004-535 Coimbra, Portugal
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Podstawka E, Sikorska E, Proniewicz LM, Lammek B. Raman and surface-enhanced Raman spectroscopy investigation of vasopressin analogues containing 1-aminocyclohexane-1-carboxylic acid residue. Biopolymers 2006; 83:193-203. [PMID: 16741975 DOI: 10.1002/bip.20545] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this work, Raman spectroscopy (RS) was employed to characterize molecular structures of [Arg8]vasopressin (AVP) and its [Acc2,D-Arg8]AVP, [Acc3]AVP, and [Cpa1, Acc3]AVP analogues. The RS band assignments have been proposed. To determine the mechanism of adsorption of the above-mentioned compounds adsorbed on a colloidal silver surface, surface-enhanced Raman spectra (SERS) were measured. The SERS spectra were used to determine relative proximity of the adsorbed functional groups of [corrected] investigated peptides and their orientation on the silver surface. The AVP and [Acc3]AVP SERS spectra (Acc: 1-aminocyclohexane-1-carboxylic acid) show that the L-tyrosine (Tyr) lies far from the metal surface, whereas the [Cpa1,Acc3]AVP spectrum (Cpa: 1-mercaptocyclohexaneacetic acid) provides evidence that Tyr interacts with the silver surface. These results suggest that [corrected] the binding of the Tyr-ionized phenolic group might be responsible for the selectivity of the analogues. We show that the aromatic ring of L-phenylalanine (Phe) of AVP and [Acc2,D-Arg8]AVP interacts with the silver surface. The strength of this interaction is considerably weaker for [Acc2,D-Arg8]AVP than for AVP. This might be due either to a longer distance between the Phe ring and the silver surface, or to the almost perpendicular orientation of the Phe ring towards the surface. The carbonyl group of the L-glutamine [corrected] (Gln) or L-asparagine [corrected](Asn) of AVP, [Acc2,D-Arg8]AVP, and [Acc3]AVP is strongly bound to the silver surface. We have also found that all peptides adsorb on the silver surface via sulfur atoms of the disulfide bridge, adopting a "GGG" conformation, except [Cpa1,Acc3]AVP, which accepts a "TGG" geometry.
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Affiliation(s)
- Edyta Podstawka
- Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, Ingardena 3 Str., 30-060 Kraków, Poland
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Podstawka E, Ozaki Y, Proniewicz LM. Part III: Surface-enhanced Raman scattering of amino acids and their homodipeptide monolayers deposited onto colloidal gold surface. Appl Spectrosc 2005; 59:1516-26. [PMID: 16390592 DOI: 10.1366/000370205775142520] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Surface-enhanced Raman scattering (SERS) spectra were measured for monolayers of various amino acids: L-methionine (Met), L-cysteine (Cys), L-glycine (Gly), L-leucine (Leu), L-phenylalanine (Phe), and L-proline (Pro) and their homodipeptides (Met-Met, Cys-Cys, Gly-Gly, Leu-Leu, Phe-Phe, and Pro-Pro) deposited onto a colloidal gold surface. Orientation of amino acids and their homodipeptides, as well as specific-competitive interactions of their functional groups with the gold surface, were predicted by detailed spectral analysis of the obtained SERS spectra. The analysis performed allowed us to propose a particular surface geometry for each amino acid and homodipeptide on the gold surface. In addition, we compared the structures of these molecules adsorbed on colloidal gold and silver surfaces.
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Affiliation(s)
- Edyta Podstawka
- Laser Raman Laboratory, Regional Laboratory of Physicochemical Analysis and Structural Research, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland.
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Kaczor A, Proniewicz LM. Molecular structure of 2-(hydroxyimino)propanohydroxamic acid in solid state and DMSO solution. Spectrochim Acta A Mol Biomol Spectrosc 2005; 62:1023-31. [PMID: 16297658 DOI: 10.1016/j.saa.2005.04.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2004] [Accepted: 04/07/2005] [Indexed: 05/05/2023]
Abstract
The 1H and 13C NMR spectra of 2-(hydroxyimino)propanohydroxamic acid (hpha) were measured in DMSO-d6 solution. The set of several monomeric structures along with the cluster of H-bonded hpha with three DMSO molecules were proposed to fit the experimental data. The calculated chemical shifts [B3LYP/6-311++G(d,p)] strongly suggested the formation of the cluster in which all the labile protons were H-bonded to the solvent molecules. The comparison between experimental and calculated Raman spectra of hpha in DMSO also suggested that in these conditions the investigated compound forms the proposed cluster rather than dimers. According to our calculations [B3LYP/6-31+G(d)] this cluster was energetically stabilized (84-106 kJ mol-1) compared to postulated dimeric structures. On the other hand, formation of dimers was proposed to be present for hpha in solid state. The comparison of the vibrational data (IR, RS) with the computed harmonic frequencies of three most probable dimers [B3LYP/6-31+G(d)] suggested that the dimer in which molecules adopted the zEe-keto form and were linked by two symmetric, almost linear H-bonds between the carbonyl oxygen atoms and the hydroxamic O-H protons was the predominant species of hpha in the solid state. Thus, the structures of hpha in solid state and DMSO solution appeared to be different.
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Affiliation(s)
- Agnieszka Kaczor
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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