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Hendrikse RL, Bayly AE, Jimack PK, Lai X. Using Raman Spectroscopy and Molecular Dynamics to Study Conformation Changes of Sodium Lauryl Ether Sulfate Molecules. J Phys Chem B 2023; 127:4676-4686. [PMID: 37192532 DOI: 10.1021/acs.jpcb.3c02022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A study using both Raman spectroscopy and molecular dynamics (MD) simulations was carried out for alkyl ethoxysulfate (AES) surfactants at various concentrations in solution. Direct comparison between experiment and simulation shows that the conformational changes observed in MD are in good agreement with those obtained via Raman spectroscopy. We show that there is an increase in the relative number of trans conformations with increasing concentration and illustrate the relationship between phase structure and molecular conformation, which is often speculated but difficult to confirm. Our results open up the possibility of applying MD to other surfactants, with the aim of analyzing conformational behavior, which can typically be difficult to study experimentally using spectroscopy methods, due to large numbers of vibrational modes present in large complex molecules.
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Affiliation(s)
- Rachel L Hendrikse
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
- EPSRC Centre for Doctoral Training in Fluid Dynamics at Leeds, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Andrew E Bayly
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Peter K Jimack
- EPSRC Centre for Doctoral Training in Fluid Dynamics at Leeds, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Xiaojun Lai
- School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom
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2
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Dias Santos J, Pinto PF, Edwards HGM, Cappa de Oliveira LF. Characterization by Raman and infrared spectroscopy and fluorescence microscopy of human hair treated with cosmetic products. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 280:121577. [PMID: 35792483 DOI: 10.1016/j.saa.2022.121577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 06/28/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
Analytical studies on hair structures have evolved significantly over the years and vibrational spectroscopic techniques, such as Raman and infrared, have been increasingly used for such purposes. Nowadays, there is a need to understand more and more about the action of cosmetics on the hair fiber, so this work aims to analyze the permeation of cosmetic treatments into the hair. For the molecular structural characterization, Raman and infrared spectroscopy techniques were used, being verified the efficiency in the analysis of hair samples, demonstrating the internal characteristics of the fiber and the permeation of different cosmetics. Four cosmetics were chosen for this study and, due to the techniques used, it was possible to observe the diffusion of these products inside the bleached hair. It was observed with the Raman vibrational spectroscopy that the concentration of the products is found mainly in the cuticular region, decreasing the permeate content when approaching the central region, and the infrared spectroscopy showed results compatible with the Raman spectroscopy. Therefore, vibrational spectroscopy proved to be a valuable tool for the study of cosmetic permeation into the hair fiber and for the analysis of its external and internal structure.
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Affiliation(s)
- Jordana Dias Santos
- Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora 36036-900, MG, Brazil
| | - Priscila F Pinto
- Departamento de Bioquímica, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora 36036-900, MG, Brazil
| | - Howell G M Edwards
- School of Chemistry and Biosciences, Faculty of Life Sciences, University of Bradford, Bradford, West Yorkshire BD7 1DP, United Kingdom
| | - Luiz F Cappa de Oliveira
- Núcleo de Espectroscopia e Estrutura Molecular, Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora 36036-900, MG, Brazil.
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Kitanosono T, Xu P, Kobayashi S. Chiral Lewis acids integrated with single-walled carbon nanotubes for asymmetric catalysis in water. Science 2018; 362:311-315. [PMID: 30337405 DOI: 10.1126/science.aap7883] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 05/27/2018] [Accepted: 08/22/2018] [Indexed: 12/22/2022]
Abstract
The development of highly reactive and stereoselective catalytic systems is required not only to improve existing synthetic methods but also to invent distinct chemical reactions. Herein, a homogenized combination of nickel-based Lewis acid-surfactant-combined catalysts and single-walled carbon nanotubes is shown to exhibit substantial activity in water. In addition to the enhanced reactivity, stereoselective performance and long-term stability were demonstrated in asymmetric conjugate addition reactions of aldoximes to furnish chiral nitrones in high yields with excellent selectivities. The practical and straightforward application of the designed catalysts in water provides an expedient, environmentally benign, and highly efficient pathway to access optically active compounds.
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Affiliation(s)
- Taku Kitanosono
- Department of Chemistry, School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Pengyu Xu
- Department of Chemistry, School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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Cabeza O, Segade L, Domínguez-Pérez M, Rilo E, Ausín D, Martinelli A, Yaghini N, Gollas B, Kriechbaum M, Russina O, Triolo A, López-Lago E, Varela LM. Mesostructure and physical properties of aqueous mixtures of the ionic liquid 1-ethyl-3-methyl imidazolium octyl sulfate doped with divalent sulfate salts in the liquid and the mesomorphic states. Phys Chem Chem Phys 2018. [DOI: 10.1039/c7cp07999k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mesomorphic liquid crystal character and effect on physical properties.
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Bondy AL, Craig RL, Zhang Z, Gold A, Surratt JD, Ault AP. Isoprene-Derived Organosulfates: Vibrational Mode Analysis by Raman Spectroscopy, Acidity-Dependent Spectral Modes, and Observation in Individual Atmospheric Particles. J Phys Chem A 2017; 122:303-315. [DOI: 10.1021/acs.jpca.7b10587] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Amy L. Bondy
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109 United States
| | - Rebecca L. Craig
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109 United States
| | - Zhenfa Zhang
- Department
of Environmental Sciences and Engineering, Gillings School of Global
Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Avram Gold
- Department
of Environmental Sciences and Engineering, Gillings School of Global
Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jason D. Surratt
- Department
of Environmental Sciences and Engineering, Gillings School of Global
Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Andrew P. Ault
- Department
of Chemistry, University of Michigan, Ann Arbor, Michigan 48109 United States
- Department
of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan 48109, United States
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Ng KC, Chu LK. Effects of Surfactants on the Purple Membrane and Bacteriorhodopsin: Solubilization or Aggregation? J Phys Chem B 2013; 117:6241-9. [DOI: 10.1021/jp401254j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ka Chon Ng
- Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Rd., Hsinchu 30013,
Taiwan
| | - Li-Kang Chu
- Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Rd., Hsinchu 30013,
Taiwan
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Pereira RFP, Valente AJM, Burrows HD, de Zea Bermudez V, Carvalho RA, Castro RAE. Structural characterization of solid trivalent metal dodecyl sulfates: from aqueous solution to lamellar superstructures. RSC Adv 2013. [DOI: 10.1039/c2ra21906a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Comprehensive study of dynamic curing effect on tablet coating structure. Eur J Pharm Biopharm 2012; 81:657-65. [PMID: 22561957 DOI: 10.1016/j.ejpb.2012.04.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 04/03/2012] [Accepted: 04/16/2012] [Indexed: 11/23/2022]
Abstract
The dissolution method is still widely used to determine curing end-points to ensure long-term stability of film coatings. Nevertheless, the process of curing has not yet been fully investigated. For the first time, joint techniques were used to elucidate the mechanisms of dynamic curing over time from ethylcellulose (Aquacoat)-based coated tablets. X-ray micro-computed tomography (XμCT), Near Infrared (NIR), and Raman spectroscopies as well as X-ray microdiffraction were employed as non-destructive techniques to perform direct measurements on tablets. All techniques indicated that after a dynamic curing period of 4h, reproducible drug release can be achieved and no changes in the microstructure of the coating were any longer detected. XμCT analysis highlighted the reduced internal porosity, while both NIR and Raman measurements showed that spectral information remained unaltered after further curing. X-ray microdiffraction revealed densification of the coating layer with a decrease in the overall coating thickness of about 10 μm as a result of curing. In addition, coating heterogeneity attributed to cetyl alcohol was observed from microscopic images and Raman analysis. This observation was confirmed by X-ray microdiffraction that showed that crystalline cetyl alcohol melted and spread over the coating surface with curing. Prior to curing, X-ray microdiffraction also revealed the existence of two coating zones differing in crystalline cetyl alcohol and sodium lauryl sulfate concentrations which could be explained by migration of these constituents within the coating layer. Therefore, the use of non-destructive techniques allowed new insights into tablet coating structures and provided precise determination of the curing end-point compared to traditional dissolution testing. This thorough study may open up new possibilities for process and formulation control.
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Leitch JJ, Collins J, Friedrich AK, Stimming U, Dutcher JR, Lipkowski J. Infrared studies of the potential controlled adsorption of sodium dodecyl sulfate at the Au(111) electrode surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:2455-2464. [PMID: 22204422 DOI: 10.1021/la204451s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Quantitative subtractively normalized interfacial Fourier transform infrared reflection spectroscopy (SNIFTIRS) was used to determine the conformation and orientation of sodium dodecyl sulfate (SDS) molecules adsorbed at the single crystal Au(111) surface. The SDS molecules form a hemimicellar/hemicylindrical (phase I) structure for the range of potentials between -200 ≤ E < 450 mV and condensed (phase II) film for electrode potentials ≥500 mV vs Ag/AgCl. The SNIFTIRS measurements indicate that the alkyl chains within the two adsorbed states of SDS film are in the liquid-crystalline state rather than the gel state. However, the sulfate headgroup is in an oriented state in phase I and is disordered in phase II. The newly acquired SNIFTIR spectroscopy measurements were coupled with previous electrochemical, atomic force microscopy, and neutron reflectivity data to improve the current existing models of the SDS film adsorbed on the Au(111) surface. The IR data support the existence of a hemicylindrical film for SDS molecules adsorbed at the Au(111) surface in phase I and suggest that the structure of the condensed film in phase II can be more accurately modeled by a disordered bilayer.
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Affiliation(s)
- J Jay Leitch
- Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Wang W, Gu B, Liang L. Effect of Surfactants on the Formation, Morphology, and Surface Property of Synthesized SiO2Nanoparticles. J DISPER SCI TECHNOL 2005. [DOI: 10.1081/dis-200027309] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Leontidis E, Kyprianidou-Leodidou T, Caseri W, Robyr P, Krumeich F, Kyriacou KC. From Colloidal Aggregates to Layered Nanosized Structures in Polymer−Surfactant Systems. 1. Basic Phenomena. J Phys Chem B 2001. [DOI: 10.1021/jp0029966] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Epameinondas Leontidis
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
| | - Tasoula Kyprianidou-Leodidou
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
| | - Walter Caseri
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
| | - Pierre Robyr
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
| | - Frank Krumeich
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
| | - Kyriacos C. Kyriacou
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus, Institut für Polymere, ETH Zentrum, CH-8092 Zürich, Switzerland, Laboratorium für Anorganische Chemie, ETH Zentrum, CH-8092 Zürich, Switzerland, and The Cyprus Institute of Neurology and Genetics, P.O. Box 3462, 1683 Nicosia, Cyprus
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Kartha SB, Gaikar VG, Sharma MM, Kartha VB. Laser Raman and infrared studies on hydrotropes and related materials. J CHEM SCI 1990. [DOI: 10.1007/bf03040797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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