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Fu Z, Chen J, Chen X, Sun Y, Wang F, Yang J. Exploring the Application of Terahertz Metamaterials Based on Metallic Strip Structures in Detection of Reverse Micelles. BIOSENSORS 2024; 14:338. [PMID: 39056614 PMCID: PMC11275120 DOI: 10.3390/bios14070338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 07/05/2024] [Accepted: 07/06/2024] [Indexed: 07/28/2024]
Abstract
Terahertz spectroscopy has unique advantages in the study of biological molecules in aqueous solutions. However, water has a strong absorption capability in the terahertz region. Reducing the amount of liquid could decrease interference with the terahertz wave, which may, however, affect the measurement accuracy. Therefore, it is particularly important to balance the amount and water content of liquid samples. In this work, a terahertz metamaterial sensor based on metallic strips is designed, fabricated, and used to detect reverse micelles. An aqueous confinement environment in reverse micelles can improve the signal-to-noise ratio of the terahertz response. Due to "water pool" trapped in reverse micelles, the DOPC (1,2-dioleoyl-sn-glycero-3-phosphocholine) solution and DOPC emulsion can successfully be identified in intensity by terahertz spectroscopy. Combined with the metamaterial sensor, an obvious frequency shift of 30 GHz can be achieved to distinguish the DOPC emulsion (5%) from the DOPC solution. This approach may provide a potential way for improving the sensitivity of detecting trace elements in a buffer solution, thus offering a valuable toolkit toward bioanalytical applications.
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Affiliation(s)
| | | | | | | | | | - Jing Yang
- College of Science, Shanghai Institute of Technology, 100 Haiquan Road, Shanghai 201418, China; (Z.F.); (J.C.); (X.C.); (Y.S.); (F.W.)
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Arkhipov R, Pakhomov A, Arkhipov M, Babushkin I, Demircan A, Morgner U, Rosanov N. Population difference gratings created on vibrational transitions by nonoverlapping subcycle THz pulses. Sci Rep 2021; 11:1961. [PMID: 33479279 PMCID: PMC7820408 DOI: 10.1038/s41598-021-81275-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 01/04/2021] [Indexed: 11/09/2022] Open
Abstract
We study theoretically a possibility of creation and ultrafast control (erasing, spatial frequency multiplication) of population density gratings in a multi-level resonant medium having a resonance transition frequency in the THz range. These gratings are produced by subcycle THz pulses coherently interacting with a nonlinear medium, without any need for pulses to overlap, thereby utilizing an indirect pulse interaction via an induced coherent polarization grating. High values of dipole moments of the transitions in the THz range facilitate low field strength of the needed THz excitation. Our results clearly show this possibility in multi-level resonant media. Our theoretical approach is based on an approximate analytical solution of time-dependent Schrödinger equation (TDSE) using perturbation theory. Remarkably, as we show here, quasi-unipolar subcycle pulses allow more efficient excitation of higher quantum levels, leading to gratings with a stronger modulation depth. Numerical simulations, performed for THz resonances of the [Formula: see text] molecule using Bloch equations for density matrix elements, are in agreement with analytical results in the perturbative regime. In the strong-field non-perturbative regime, the spatial shape of the gratings becomes non-harmonic. A possibility of THz radiation control using such gratings is discussed. The predicted phenomena open novel avenues in THz spectroscopy of molecules with unipolar and quasi-unipolar THz light bursts and allow for better control of ultra-short THz pulses.
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Affiliation(s)
- Rostislav Arkhipov
- St. Petersburg State University, Saint Petersburg, Russian Federation
- ITMO University, Saint Petersburg, Russian Federation
- Ioffe Institute, Saint Petersburg, Russian Federation
| | | | - Mikhail Arkhipov
- St. Petersburg State University, Saint Petersburg, Russian Federation
- ITMO University, Saint Petersburg, Russian Federation
| | - Ihar Babushkin
- University of Hannover, Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Disciplines), Hannover, Germany.
- Max Born Institute, Berlin, Germany.
| | - Ayhan Demircan
- University of Hannover, Hannover, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Disciplines), Hannover, Germany
| | - Uwe Morgner
- University of Hannover, Hannover, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering-Innovation Across Disciplines), Hannover, Germany
| | - Nikolay Rosanov
- ITMO University, Saint Petersburg, Russian Federation
- Ioffe Institute, Saint Petersburg, Russian Federation
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Yang J, Tang C, Wang Y, Chang C, Zhang J, Hu J, Lü J. The terahertz dynamics interfaces to ion–lipid interaction confined in phospholipid reverse micelles. Chem Commun (Camb) 2019; 55:15141-15144. [DOI: 10.1039/c9cc07598d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The terahertz dynamics of water nanodroplets confined in phospholipid reverse micelles are studied as a probe for metal ion–membrane interface interactions.
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Affiliation(s)
- Jing Yang
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
| | - Chao Tang
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
| | - Yadi Wang
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
| | - Chao Chang
- Advanced Interdisciplinary Technology Research Center
- National Innovation Institute of Defense Technology
- Beijing 100071
- China
| | - Jianbing Zhang
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
| | - Jun Hu
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
| | - Junhong Lü
- CAS Key Laboratory of Interfacial Physics and Technology
- Shanghai Institute of Applied Physics
- Chinese Academy of Science
- Shanghai 201800
- China
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Mohan V, Sen P. Elucidation of active site dynamics of papain and the effect of encapsulation within cationic and anionic reverse micelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 200:202-211. [PMID: 29694928 DOI: 10.1016/j.saa.2018.04.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/30/2018] [Accepted: 04/15/2018] [Indexed: 06/08/2023]
Abstract
In this study, steady state, solvation dynamics and rotational dynamics experiments have been carried out on a system of DACIA-tagged papain in bulk water and inside the water pool of cationic (cetyltrimethylammonium bromide, CTAB) and anionic (sodium bis(2-ethylhexyl)sulfosuccinate, AOT) reverse micelles with varying water contents (W0 = 20 to 50). While the absorption and emission maxima and the excited state lifetime did not show any noticeable change with the variation of the size of the reverse micelle, the change in solvation time, Stokes shift, rotational correlation time and residual anisotropy with the change in reverse micellar size were quite revealing. The average solvation time and Stokes shift of papain in bulk water are 0.22 ns and 125 cm-1 respectively, which increase to 0.96 ns and 718 cm-1 while inside CTAB reverse micelle of W0 = 20. The solvation time and Stokes shift values decrease with the increase in the size of reverse micelle, approaching the corresponding values in bulk water when W0 = 50. The solvation time and Stokes shift of the DACIA-tagged papain was found to be high while inside AOT reverse micelle also (0.47 ns and 438 cm-1 respectively when W0 = 20), but there was no monotonous variation with the change in size of micellar size as in the case with CTAB reverse micelle. From the anisotropy studies, it was seen that inside CTAB and AOT reverse micelles, there is a significant amount of residual anisotropy, which is absent in the case of DACIA-tagged papain in bulk water. The rotational correlation times were also found to be higher inside the reverse micelles than those in bulk water. Both residual anisotropy and rotational correlation time were found to be more in the case with AOT reverse micelle than with CTAB reverse micelle. These behaviours could be explained based on the electrostatic forces acting between the papain having a positive surface charge and the reverse micelles of cationic CTAB and anionic AOT.
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Affiliation(s)
- Vaisakh Mohan
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Pratik Sen
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India.
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Murakami H. Persistent optical hole-burning spectroscopy of nano-confined dye molecules in liquid at room temperature: Spectral narrowing due to a glassy state and extraordinary relaxation in a nano-cage. J Chem Phys 2018; 148:144505. [PMID: 29655335 DOI: 10.1063/1.5008448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Persistent optical hole-burning spectroscopy has been conducted for a dye molecule within a very small (∼1 nm) reverse micelle at room temperature. The spectra show a spectral narrowing due to site-selective excitation. This definitely demonstrates that the surroundings of the dye molecule are in a glassy state regardless of a solution at room temperature. On the other hand, the hole-burning spectra exhibit large shifts from excitation frequencies, and their positions are almost independent of excitation frequencies. The hole-burning spectra have been theoretically calculated by taking account of a vibronic absorption band of the dye molecule under the assumption that the surroundings of the dye molecule are in a glassy state. The calculated results agree with the experimental ones that were obtained for the dye molecule in a polymer glass for comparison, where it has been found that the ratio of hole-burning efficiencies of vibronic- to electronic-band excitations is quite high. On the other hand, the theoretical results do not explain the large spectral shift from the excitation frequency and small spectral narrowing observed in the hole-burning spectra measured for the dye-containing reverse micelle. It is thought that the spectral shift and broadening occur within the measurement time owing to the relaxation process of the surroundings that are hot with the thermal energy deposited by the dye molecule optically excited. Furthermore, the relaxation should be temporary because the cooling of the inside of the reverse micelle takes place with the dissipation of the excess thermal energy to the outer oil solvent, and so the surroundings of the dye molecule return to the glassy state and do not attain the thermal equilibrium. These results suggest that a very small reverse micelle provides a unique reaction field in which the diffusional motion can be controlled by light in a glassy state.
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Affiliation(s)
- Hiroshi Murakami
- QST Advanced Study Laboratory and Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), Kizugawa City, Kyoto 619-0215, Japan
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IR Spectra of Different O 2-Content Hemoglobin from Computational Study: Promising Detector of Hemoglobin Variant in Medical Diagnosis. Interdiscip Sci 2017; 9:322-331. [PMID: 28352971 DOI: 10.1007/s12539-017-0217-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 01/08/2017] [Accepted: 02/04/2017] [Indexed: 10/19/2022]
Abstract
IR spectra of heme and different O2-content hemoglobin were studied by the quantum computation method at the molecule level. IR spectra of heme and different O2-content hemoglobin were quantificationally characterized from 0 to 100 THz. The IR spectra of oxy-heme and de-oxy-heme are obviously different at the frequency regions of 9.08-9.48, 38.38-39.78, 50.46-50.82, and 89.04-91.00 THz. At 24.72 THz, there exists the absorption peak for oxy-heme, whereas there is not the absorption peak for de-oxy-heme. Whether the heme contains Fe-O-O bond or not has the great influence on its IR spectra and vibration intensities of functional groups in the mid-infrared area. The IR adsorption peak shape changes hardly for different O2-content hemoglobin. However, there exist three frequency regions corresponding to the large change of IR adsorption intensities for containing-O2 hemoglobin in comparison with de-oxy-hemoglobin, which are 11.08-15.93, 44.70-50.22, and 88.00-96.68 THz regions, respectively. The most differential values with IR intensity of different O2-content hemoglobin all exceed 1.0 × 104 L mol-1 cm-1. With the increase of oxygen content, the absorption peak appears in the high-frequency region for the containing-O2 hemoglobin in comparison with de-oxy-hemoglobin. The more the O2-content is, the greater the absorption peak is at the high-frequency region. The IR spectra of different O2-content hemoglobin are so obviously different in the mid-infrared region that it is very easy to distinguish the hemoglobin variant by means of IR spectra detector. IR spectra of hemoglobin from quantum computation can provide scientific basis and specific identification of hemoglobin variant resulting from different O2 contents in medical diagnosis.
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George DK, Charkhesht A, Hull OA, Mishra A, Capelluto DGS, Mitchell-Koch KR, Vinh NQ. New Insights into the Dynamics of Zwitterionic Micelles and Their Hydration Waters by Gigahertz-to-Terahertz Dielectric Spectroscopy. J Phys Chem B 2016; 120:10757-10767. [DOI: 10.1021/acs.jpcb.6b06423] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Deepu K. George
- Department
of Physics and Center of Soft Matter and Biological Physics, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Ali Charkhesht
- Department
of Physics and Center of Soft Matter and Biological Physics, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Olivia A. Hull
- Department
of Chemistry, Wichita State University, Wichita, Kansas 67260, United States
| | - Archana Mishra
- Department
of Chemistry, Wichita State University, Wichita, Kansas 67260, United States
| | - Daniel G. S. Capelluto
- Protein
Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity
Institute, and Center of Soft Matter and Biological Physics, Virginia Tech, Blacksburg, Virginia 24061, United States
| | | | - Nguyen Q. Vinh
- Department
of Physics and Center of Soft Matter and Biological Physics, Virginia Tech, Blacksburg, Virginia 24061, United States
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Sengupta B, Yadav R, Sen P. Startling temperature effect on proteins when confined: single molecular level behaviour of human serum albumin in a reverse micelle. Phys Chem Chem Phys 2016; 18:14350-8. [DOI: 10.1039/c6cp00452k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The present work reports the effect of confinement, and temperature therein, on the conformational fluctuation dynamics of domain-I of human serum albumin (HSA) by fluorescence correlation spectroscopy (FCS).
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Affiliation(s)
- Bhaswati Sengupta
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
| | - Rajeev Yadav
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
| | - Pratik Sen
- Department of Chemistry, Indian Institute of Technology Kanpur
- Kanpur
- India
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Murakami H, Sada T, Yamada M, Harada M. Nanometer-scale water droplet free from the constraint of reverse micelles at low temperatures. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:052304. [PMID: 24329261 DOI: 10.1103/physreve.88.052304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 07/02/2013] [Indexed: 06/03/2023]
Abstract
Temperature dependence of the configurational fluctuation of water confined in a reverse micellar solution has been studied by absorption spectroscopy of a probe molecule. We have found that the configurational fluctuation is liquidlike below the homogeneous nucleation temperature. This is proposed to be due to a large reduction in the confinement of water, and is explained in terms of water shedding from the reverse micelle. Further, the configurational fluctuation is frozen at ~210 K. A reverse micellar solution is considered to be a promising candidate for studies of supercooled water.
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Affiliation(s)
- H Murakami
- Kansai Photon Science Institute, Japan Atomic Energy Agency, Kyoto 619-0215, Japan
| | - T Sada
- Kansai Photon Science Institute, Japan Atomic Energy Agency, Kyoto 619-0215, Japan and Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - M Yamada
- Kansai Photon Science Institute, Japan Atomic Energy Agency, Kyoto 619-0215, Japan and Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
| | - M Harada
- Faculty of Human Life and Environment, Nara Women's University, Nara 630-8506, Japan
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Murakami H. Protein and water confined in nanometer-scale reverse micelles studied by near infrared, terahertz, and ultrafast visible spectroscopies. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2013; 93:183-211. [PMID: 24018326 DOI: 10.1016/b978-0-12-416596-0.00006-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Protein-containing reverse (PCR) micelles are suitable systems to study the properties of proteins and waters in a cell-like environment. A model for determining the structural parameters of PCR micelles, such as the aqueous cavity size and molecule number of water within the reverse micelle, is presented. The model is based on an important hypothesis that the structural parameters of the protein-unfilled reverse micelle do not change after solubilization of protein. I describe a procedure using near infrared spectroscopy of OH stretching vibration band of water to verify the hypothesis. Further, the terahertz (THz) absorption spectrum of myoglobin is derived from THz time-domain spectroscopy of the PCR micellar solution, and the states of waters in reverse micelles with and without protein are discussed on the basis of the structural parameters. The last topic is on internal dynamics of PCR micelles on timescales from femtoseconds to nanoseconds studied by femtosecond time-resolved fluorescence spectroscopy.
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Affiliation(s)
- Hiroshi Murakami
- Kansai Photon Science Institute, Japan Atomic Energy Agency, Kyoto, Japan.
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