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Takagi H, Nakano T, Aoki T, Tanimoto M. A SAXS and USAXS study of the influence of pH on the casein micelle structure. Food Chem 2024; 443:138606. [PMID: 38301565 DOI: 10.1016/j.foodchem.2024.138606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 02/03/2024]
Abstract
Changes in milk pH significantly influence the behavior and physical properties of casein micelles; however, the effects of these changes on casein micelle structures are still unclear. The aim of this study was to elucidate the effect of changes in pH range from 5.9 to 7.1 on the structure of casein micelles in milk using small-angle X-ray scattering (SAXS) and ultra small-angle X-ray scattering (USAXS). The casein micelles formed one-dimensional aggregates. The micelle radius decreased with decreasing pH, whereas the size of the water domain increased. The distance between colloidal calcium phosphates (CCP) remained unchanged, whereas the CCP radius decreased with decreasing pH. Voluminosity, which was calculated from scattering intensities, increased at increased pH. In conclusion, the micelle structure changed significantly in response to changes in pH. Our findings help to understand the changes in the physical properties of milk at various pH levels in terms of the microscopic structure.
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Affiliation(s)
- Hideaki Takagi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
| | - Tomoki Nakano
- Research Division, Minami Nippon Dairy Co-op Co., Ltd., 5282, Takagi, Miyakonojyo, Miyazaki 885-0003, Japan
| | - Takayoshi Aoki
- Professor Emeritus, Kagoshima University, Hoshigamine, Kagoshima 891-0102, Japan
| | - Morimasa Tanimoto
- Professor Emeritus, University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi 400-8510, Japan; Department of Food Sciences, Tokyo Seiei College, 1-4-6, Nishishinkoiwa, Katsushika-Ku, Tokyo 124-8530, Japan
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Temperature dependence of the casein micelle structure in the range of 10–40 °C: an in-situ SAXS study. Food Chem 2022; 393:133389. [DOI: 10.1016/j.foodchem.2022.133389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 05/12/2022] [Accepted: 06/01/2022] [Indexed: 11/22/2022]
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3
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Nagasaki A, Matsuba G, Ikemoto Y, Moriwaki T, Ohta N, Osaka K. Analysis of the sol and gel structures of potato starch over a wide spatial scale. Food Sci Nutr 2021; 9:4916-4926. [PMID: 34532003 PMCID: PMC8441370 DOI: 10.1002/fsn3.2441] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 06/01/2021] [Accepted: 06/11/2021] [Indexed: 11/30/2022] Open
Abstract
We analyzed edible potato starch and observed the interaction between its granular structure and water molecules. We studied the changes caused by gelatinization during heating and stirring using microscopy, micro-FT-IR spectroscopy, and X-ray scattering techniques. A wide range of spatial scales was revealed using these various techniques. The rate of gelatinization varied significantly and was dependent on the starch concentration. The process of adsorption of water on starch molecules was studied using the humidity-controlled FT-IR spectroscopy technique. Furthermore, by comparing the X-ray scattering profiles of dry and wet granules, the 9-nm repeat "cluster" structure was studied. A gradual collapse of the granules occurred during the processes of heating and stirring. A clustered smectic structure and a smectic-like structure were observed in the opaque gel after gelatinization. Upon further heating, a transparent gel was obtained after the melting of the cluster.
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Affiliation(s)
- Akane Nagasaki
- Graduate School of Organic Materials EngineeringYamagata UniversityYonezawaJapan
| | - Go Matsuba
- Graduate School of Organic Materials EngineeringYamagata UniversityYonezawaJapan
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Kanamaru T, Araki M, Takahashi R, Fujii S, Shikata T, Murakami D, Tanaka M, Sakurai K. First Observation of the Hydration Layer around Polymer Chain by Scattering and Its Relationship to Thromboresistance: Dilute Solution Properties of PMEA in THF/Water. J Phys Chem B 2021; 125:7251-7261. [PMID: 34181418 DOI: 10.1021/acs.jpcb.1c01864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(2-methoxyethyl acrylate) (PMEA) is known to exhibit excellent thromboresistance, i.e., hardly causing blood-clot formation on its surface. Hence, PMEA and its analogues have been commercially used for blood-contacting materials in medical devices. In this study, we investigated the conformation and solvation state of PMEA in mixtures of tetrahydrofuran (THF) and water with various water volume fractions (ϕwater) by viscosity, sedimentation equilibrium, small-angle X-ray scattering (SAXS), and dielectric relaxation measurements. We also comparatively investigated those of poly[2-(2-methoxyethoxy)ethyl methacrylate] (PMe2MA) and polystyrene (PS). For all of these, THF is a good solvent and water is a nonsolvent or poor solvent. PMe2MA and PMEA show equally good thromboresistance, while PS does not at all. The solution properties of PMe2MA and PMEA were found to be quite different from PS. There are clear attractive interactions (or correlation) between the PMEA chain (or PMe2MA) and the waters in the vicinity of the chain despite their water insolubility. These correlated waters give additional scattering and the angular dependence of SAXS was analyzed in terms of the hydration layer model that has been used in protein solution scattering. The hydration is related to increasing both the chain stiffness and excluded volume. These distinctive properties are likely related to the origin of its good thromboresistance.
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Affiliation(s)
- Takuma Kanamaru
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 805-0135, Japan
| | - Masataka Araki
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 805-0135, Japan
| | - Rintaro Takahashi
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 805-0135, Japan
| | - Shota Fujii
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 805-0135, Japan
| | - Toshiyuki Shikata
- Division of Natural Resources and Eco-materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Daiki Murakami
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masaru Tanaka
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka 805-0135, Japan
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Yamamoto H, Tashiro K, Ishino K, Takahashi M, Endo R, Asada M, Li Y, Katsube K, Ishii T. Crystal structures and phase transition behavior of Poly(nonamethylene terephthalamide) and its model compounds. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.01.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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A two-component micelle with emergent pH responsiveness by mixing dilauroyl phosphocholine and deoxycholic acid and its delivery of proteins into the cytosol. Colloids Surf B Biointerfaces 2017; 154:246-252. [PMID: 28347946 DOI: 10.1016/j.colsurfb.2017.03.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 03/03/2017] [Accepted: 03/04/2017] [Indexed: 01/11/2023]
Abstract
Providing appropriate pH responsiveness for drug delivery nanoparticles is one of the major issues in developing a new generation of delivery systems. This paper reports that, when phosphocholine and a bile acid were mixed, the resultant two-component micelle gained pH responsiveness, while the individual components did not show any such responsiveness. The pH responsiveness was shown to be determined by the chemical structure, especially the positions and chirality of the OH groups, of the bile acid, and the sensitivity was determined by the alkyl chain length of the phosphocholine. The best combination for evading endocytosis was dilauroyl phosphocholine (DLPC) and deoxycholic acid (DA). Small-angle X-ray scattering revealed that the pH responsiveness was related to the change of surface hydrophobicity, namely, decreasing pH led to protonation of the carboxylic acid, resulting in aggregation of the preceding micelles. We assume that particles that become hydrophobic in this way can start interacting with the endocytotic bilayer, which eventually leads to rupture of the endocytotic vesicle. This mechanism is well supported by the finding that fluorescein-conjugated ovalbumin proteins were transported into the cytosol when they were co-administered with DLPC/DA.
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Competition of PEG coverage density and con-A recognition in mannose/PEG bearing nanoparticles. Colloids Surf B Biointerfaces 2016; 146:642-8. [DOI: 10.1016/j.colsurfb.2016.05.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 03/22/2016] [Accepted: 05/03/2016] [Indexed: 12/15/2022]
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Nanostructure development in multicomponent polymer systems characterized by synchrotron X-ray scattering. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.02.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Higaki Y, Suzuki K, Oniki Y, White KL, Ohta N, Takahara A. Molecular aggregation structure evolution during stretching of environmentally benign lysine-based segmented poly(urethane-urea)s. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.10.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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MATSUBA G, HEMMI K, TSUJI H, KAWAI T, KANAYA T, TOYOHARA K, ENDO K. Crystal Morphology of Poly( L-lactic Acid) and Poly( D-lactic Acid) Blends during Cooling and Heating Processes. KOBUNSHI RONBUNSHU 2015. [DOI: 10.1295/koron.2014-0039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Go MATSUBA
- Graduate School of Science and Engineering, Yamagata University
| | - Kota HEMMI
- Graduate School of Science and Engineering, Yamagata University
| | - Hideto TSUJI
- Department of Environmental and Life Science, Toyohashi University of Technology
| | - Takahiko KAWAI
- Graduate School of Science and Technology, Gumma University
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Orientation of poly(vinyl alcohol) nanofiber and crystallites in non-woven electrospun nanofiber mats under uniaxial stretching. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.07.067] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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TASHIRO K, YAMAMOTO H, YOSHIOKA T, NINH TH, SHIMADA S, NAKATANI T, IWAMOTO H, OHTA N, MASUNAGA H. New Developments in the Simultaneous Measurement System of Wide-Angle and Small-Angle X-ray Scatterings and Vibrational Spectra for the Static and Dynamic Analyses of the Hierarchical Structures of Polymer Solids. KOBUNSHI RONBUNSHU 2012. [DOI: 10.1295/koron.69.213] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Igarashi N, Watanabe Y, Shinohara Y, Inoko Y, Matsuba G, Okuda H, Mori T, Ito K. Upgrade of the small angle X-ray scattering beamlines at the Photon Factory. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/272/1/012026] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Kudo Y, Sakuragi M, Hashida S, Kuwahara R, Ishi-I T, Masunaga H, Sakurai K. Flexibility and local structure of a worm-like cylinder of self-assembled discotic triazine triamide. Polym J 2010. [DOI: 10.1038/pj.2010.72] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hashida T, Tashiro K, Ito K, Takata M, Sasaki S, Masunaga H. Correlation of Structure Changes in the Water-Induced Phase Transitions of Poly(ethylenimine) Viewed from Molecular, Crystal, and Higher-Order Levels As Studied by Simultaneous WAXD/SAXS/Raman Measurements. Macromolecules 2009. [DOI: 10.1021/ma9017857] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomoko Hashida
- Department of Future Industry-oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Kohji Tashiro
- Department of Future Industry-oriented Basic Science and Materials, Toyota Technological Institute, Tempaku, Nagoya 468-8511, Japan
| | - Kazuki Ito
- RIKEN SPring-8 Center, Kouto, Sayo, Hyogo 679-5148, Japan
| | - Masaki Takata
- RIKEN SPring-8 Center, Kouto, Sayo, Hyogo 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, Kouto, Sayo, Hyogo 679-5198, Japan
| | - Sono Sasaki
- Japan Synchrotron Radiation Research Institute, Kouto, Sayo, Hyogo 679-5198, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute, Kouto, Sayo, Hyogo 679-5198, Japan
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Nemoto T, Konishi GI, Arai T, Takata T. Synthesis and Properties of Fluorine-Containing Poly(arylenemethylene)s as New Heat Resistant Denatured Phenolic Resins. Polym J 2008. [DOI: 10.1295/polymj.pj2008044] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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