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Miyagawa A, Takahashi T, Kuzure Y, Iwamoto H, Arai T, Nagatomo S, Watanabe S, Sano Y, Nakatani K. Eu(III) transfer in single N,N,N',N'-tetraoctyldiglycolamide-impregnated polymer-coated silica particle using fluorescence microspectroscopy: transfer mechanism and effect of polymer crosslinking degree. ANAL SCI 2023; 39:1929-1936. [PMID: 37555916 DOI: 10.1007/s44211-023-00402-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/31/2023] [Indexed: 08/10/2023]
Abstract
A microcapillary manipulation system combined with fluorescence microspectroscopy enabled us to analyze mass transfer in a single particle. In this study, we revealed the Eu(III) distribution in a single diglycolamide-derivative extractant (TODGA)-impregnated polymer-coated silica particle. The reaction of Eu(III) with two TODGA molecules in the polymer layer was the rate-limiting process, which was revealed by the relationship between the rate constants (k1 and k-1) and concentrations of Eu(III) and HNO3. The decrease in the crosslinking degree of the polymer layer caused an increase in only k-1. This indicates that hydrophilic environments at lower crosslinking degrees enhance the stability of the charged Eu(III) species such as Eu3+, Eu(NO3)2+, and Eu(NO3)2+.
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Affiliation(s)
- Akihisa Miyagawa
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Takumi Takahashi
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Yoshiaki Kuzure
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Hibiki Iwamoto
- Shibaura Institute of Technology, Toyosu, Tokyo, 135-8548, Japan
| | - Tsuyoshi Arai
- Shibaura Institute of Technology, Toyosu, Tokyo, 135-8548, Japan
| | - Shigenori Nagatomo
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan
| | - Sou Watanabe
- Japan Atomic Energy Agency, Tokai-Mura, Ibaraki, 319-1194, Japan
| | - Yuichi Sano
- Japan Atomic Energy Agency, Tokai-Mura, Ibaraki, 319-1194, Japan
| | - Kiyoharu Nakatani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan.
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Miyagawa A, Ide R, Nagatomo S, Nakatani K. Distribution Behavior of Single-Stranded DNA Molecules in an Amino-Group-Functionalized Silica Microparticle. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8462-8468. [PMID: 35767692 DOI: 10.1021/acs.langmuir.2c01062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this study, we investigated the distribution behavior of single-stranded DNA molecules with 20 bases in silica particles (particle size: ∼30 μm) using confocal fluorescence microspectroscopy. The distribution kinetics was investigated under various conditions, such as the type of base (adenine, thymine, guanine, and cytosine), pore size of the particle (30 and 50 nm), and salt concentration (100, 200, and 500 mM), which changed the distribution behavior. At high salt concentrations, we observed sigmoidal kinetic behavior, which does not occur in the general distribution of small organic molecules but is often observed in protein aggregation and nuclear growth. An analytical model based on DNA aggregation explained the sigmoidal distribution behavior well, and this model also worked well when the number of DNA molecules involved in DNA aggregation was greater than two. The intraparticle diffusion of DNA molecules was analyzed using the pore and surface diffusion model. As a result, the intraparticle diffusion of DNA aggregates mainly occurs according to surface diffusion, and the surface diffusion coefficient has the same value ((2.4-6.7) × 10-9 cm2 s-1) independent of the pore size and type of base.
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Affiliation(s)
- Akihisa Miyagawa
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Ibaraki, Japan
| | - Ryosuke Ide
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Ibaraki, Japan
| | - Shigenori Nagatomo
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Ibaraki, Japan
| | - Kiyoharu Nakatani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Ibaraki, Japan
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Kinetics and mechanism of Eu(III) transfer in tributyl phosphate microdroplet/HNO 3 aqueous solution system revealed by fluorescence microspectroscopy. ANAL SCI 2022; 38:955-961. [PMID: 35551644 DOI: 10.1007/s44211-022-00117-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 04/19/2022] [Indexed: 11/01/2022]
Abstract
In this study, we reveal an Eu(III) extraction mechanism at the interface between HNO3 and tributyl phosphate (TBP) solutions using fluorescence microspectroscopy. The mass transfer rate constant at the interface is obtained from the analysis of fluorescence intensity changes during the forward and backward extractions at various HNO3 and TBP concentrations to investigate the reaction mechanism. This result indicates that one nitrate ion reacts with Eu(III) at the interface, whereas TBP molecules are not involved in the interfacial reaction, which is different from the results obtained using the NaNO3 solution in our previous study. We demonstrate that the chemical species of Eu(III) complex with nitrate ion and TBP in the aqueous solution play an important role for the extraction mechanism. The rate constants of the interfacial reactions in the forward and backward extractions are (4.0-5.0) × 10-7 m M-1 s-1 and (3.2-3.3) × 10-6 m s-1, respectively. We expect that our revealed mechanism provides useful and fundamental knowledge for actual solvent extraction.
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Miyagawa A, Takeuchi M, Arai T, Watanabe S, Sano Y, Nakatani K. Acid Dissociation Constant of Bis(2-ethlhexyl) Hydrogen Phosphate Impregnated in a Polymer Layer Coated on Silica Microparticles. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Akihisa Miyagawa
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571
| | | | - Tsuyoshi Arai
- Shibaura Institute of Technology, Toyosu, Tokyo 135-8548
| | - Sou Watanabe
- Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1194
| | - Yuichi Sano
- Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1194
| | - Kiyoharu Nakatani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571
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Miyagawa A, Nagatomo S, Kazami H, Terada T, Nakatani K. Kinetic Analysis of the Mass Transfer of Zinc Myoglobin in a Single Mesoporous Silica Particle by Confocal Fluorescence Microspectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:12697-12704. [PMID: 34672614 DOI: 10.1021/acs.langmuir.1c02127] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The adsorption/desorption mechanisms of biomolecules in porous materials have attracted significant attention because of their applications in many fields, including environmental, medical, and industrial sciences. Here, we employ confocal fluorescence microspectroscopy to reveal the diffusion behavior of zinc myoglobin (ZnMb, 4.4 nm × 4.4 nm × 2.5 nm) as a spherical protein in a single mesoporous silica particle (pore size of 15 nm). The measurement of the time course of the fluorescence depth profile of the particle reveals that intraparticle diffusion is the rate-limiting process of ZnMb in the particle. The diffusion coefficients of ZnMb in the particle for the distribution (Ddis) and release (Dre) processes are determined from the rate constants, e.g., Ddis = 1.65 × 10-10 cm2 s-1 and Dre = 3.68 × 10-10 cm2 s-1, for a 10 mM buffer solution. The obtained D values for various buffer concentrations are analyzed using the pore and surface diffusion model. Although surface diffusion is the main distribution process, the release process involves pore and surface diffusion, which have not been observed with small organic molecules; the mechanism of transfer of small molecules is pore diffusion alone. We demonstrate that the mass transfer kinetics of ZnMb in the silica particle can be explained well on the basis of pore and surface diffusion.
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Affiliation(s)
- Akihisa Miyagawa
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Shigenori Nagatomo
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Hiroaki Kazami
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Takuto Terada
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Kiyoharu Nakatani
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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